Onan YD Genend Manual
900-0184 Onan YD Generators & Controls Service manual (11-1983)L 900-0184 Onan YD Generators & Controls Service manual (11-1983)L
User Manual: Onan-YD-Genend-Manual onan
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Caution: This document contains mixed page sizes (8.5 x 11 or 11 x 17), which may affect printing. Please adjust your printer settings according to the size of each page you wish to print. Service Manual Generators and Controls 4.5 to 30.0 kW USED ON: J-SERIES SETS SK AND DTA SERIES SETS PTO ALTERNATORS TWO BEARING ALTERNATORS 900-0184 Reprinted 11-83 Printed in USA SAFETY PRECAUTIONS moving parts, etc. The following symbols in this manual highlight conditions potentially dangerous to service personnel, or equipment. Read this manual carefully. Know when these conditions can exist. Then take necessary steps to protect personnel as well as equipment. Do not work on this equipment when mentally or physically fatigued. GUARD AGAINST ELECTRIC SHOCK Disconnect electric power before removing protective shields or touching electrical equipment. Use rubber insulative mats placed on dry wood platforms over floors that are metal or concrete when around electrical equipment. Do not wear damp clothing (particularly wet shoes) or allow skin surfaces to be damp when handling electrical equipment. This symbol warns of immediate hazards which will result in severe personal injury or death. @!@!%I This symbol refers to a hazard or @ % unsafe !!@ practice which I can result in severe personal injury or death. This symbol refers to a hazard or unsafe practice which can result in personal injury or product or propetiy damage. Disconnect batteries to prevent accidental engine start. Jewelry is a good conductor of electricity and should be removed before working on electrical equipment. PROTECT AGAINST MOVING PARTS Use extreme caution when working on electrical components. High voltages cause injury or death. Avoid moving parts of the unit. Avoid use of loose jackets, shirts or sleeves due to danger of becoming caught in moving parts. ' Follow all state and local codes. To avoid possible personal injury or equipment damage, a qualified electrician or an authorized service representative must perform installation and all service. Make sure all nuts and bolts are secure. Keep power shields and guards in position. If you must make adjustments while the unit is running, use extreme caution around hot manifolds, IAWARNING I EXHAUST GAS IS DEADLY! Exhaust gases contain carbon monoxide, an odorless and colorless gas. Carbon monoxideis poisonous and can cause unconsciousnessand death. Symptoms of carbon monoxidepoisoning can include: 0 Dizziness Nausea Headache Weakness and Sleepiness Throbbing in Temples Muscular Twitching Vomiting Inability to Think Coherently IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. It symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired. Protection against carbon monoxide inhalation includes proper installation and regular, frequent visual and audible inspections of the completeexhaust system. 1-PIEM Redistribution or publication of this document, by any means, is strictly prohibited. Supplement 900-1002 Date: 12-94 lnsett withTile: YD Generators and Controls Service Manual Number: 900-0184 Date: 11-83 ~~ ~ ~ ~ This supplementto the YD Service Manualadds information specific to the Onan PROTECseries of YD PTO AC generator/voltage regulator systems. NOTE: The YD PTO product referred to in the YD Service Manual is an earlier Onan product, no longer being manufactured. CONTENTS OF SUPPLEMENT TITLE PAGE GeneratorNoltage Regulator Troubleshooting ........................................ 1 GeneratodRegulator Tests ........................................................ .5 12/15 KW Generator Meter/Breaker Panel Schematic Diagram (615-0426) .............. 13 16/20,20/24 KW Generator MeterBreaker Panel Schematic Diagram (615-0427) ........ 14 24/30,30/35 KW Generator MeterBreaker Panel Schematic Diagram (615-0428) ....... . I 5 YD PTO AC Generator Wiring Diagram (612-6678) GENERATOWVOLTAGE REGULATOR TROUBLESHOOTING .................................. .I6 To troubleshoot a problem, start at upper left comer of the chart related to the problem, and answer all questions either YES or NO. Follow the chart untilthe problem is found, performing referenced Adjustment and Test procedures following the Flow Charts. This section contains troubleshooting information for the generator and its electronic voltage regulator. Determinethe problem and then refer to the appropriate flow chart (A, 8, CyD, or E) for troubleshooting procedures. Referenced components in the Flow Charts and Adjustment and Test procedures can be found on the schematic and wiring diagrams found in this supplement, and in the assembly drawings found in the lnstallation Manual. A. NO AC OUTPUT VOLTAGE AT RATED RPM. B. UNSTABLE OUTPUT VOLTAGE, ENGINE SPEED STABLE. C. OUTPUT VOLTAGE TOO HIGH OR LOW D. EXCITER FIELD BREAKER TRIPS E. UNBALANCED GENERATOR OUTPUT VOLTAGE NOTE Generator disassembly/assembly procedures and PROTEC seriesYD PTO generator configurations may be found in the YD Service Manual (900-0184) and in the PROTEC Operator’s ManuaI (929-0100) and InstallationManual (-). 1 FLOW CHART A. NO AC OUTPUT VOLTAGE AT RATED ENGINE RPM START Is control panel field breaker CB21 on? Replace defective and check continuity with ohmmeter. Is breaker open? no .) Push to reset breaker. Does generator AC outputvoltage build up? I no Yes If voltage is unstable, high or low, or causes breaker to trip, see Flow Charts B, C, D or E. - Flash exciter fidd per TEST C. Does generator output voltage build up? 3 of VR215 to 10 VAG or more? (TESTA) I I Yes no 1 Check diodes CR1 through CR6 on rotor per TEST F. Replace if bad. across WE1 terminals 4 and 5 5 VDC or more? Check exciter field wiring for shorts per TEST L Replace bad wiring. I Yes Check exciter rotor winding per TEST H. Replace if bad. I I Check exciter fidd wiring Replace bad wiring. Check generator rotor winding per TEST K. Replace if bad. Replace fhe regulator PC board per procedure E if defective. I 1 I Check exciter field winding 1 Check generator stator windings Der TEST J. ReDlace if bad. I 1- Conbct wifh high vol&ge can cause severe personal injury or death. Do nof touch any exposed wiring or components wiih any parf of the body, clothing, tool orjewelry-. Do not usenon-insulated toolsinside the control. Sbnd onaninsulating mat or dry woodplaffom when the control doors are open. 1- A newprinfedcircuitboardcan be damaged bymalrUnctioningcomponents within thecontrol. Do not insiall the new PC board until all other problems have been located and corrected. 2 Redistribution or publication of this document, by any means, is strictly prohibited. FLOW CHART B. UNSTABLEVOLTAGE, ENGINE SPEED STABLE Are there any broken wires or loose connections on the voltage regulator Repair as required. I Repair wiring or replace as required. I assembly? Check wiring harness from regulator assembly to end bell per TEST L. no Check okav? I Yes Replace the regulator PC board per 1- I-[ A new prinfed circuit board can be damagedbymaifunctioningcomponents within the confro/. Do not insfall the new PC board until all other pro& lems have been located and corrected. 1- Conbct with high volbge can cause severe personal injury or death. Do nof touch any exposed wiring orcomponents withany parf of the bod5 clothing, tool orjewely. Do not use non-insulated tools inside fhe control. Sfand on an insulating mat or dw wood platform when the control doors are open. FLOW CHART C. OUTPUT VOLTAGE TOO HIGH OR LOW START I ISengine 1-ur Set RPM per instructionsin appropriate engine and/or governor manual. no I Does adjustmentof Voltage Adjust control on ihe regulator board result in yes 1- I Set control per Voltage Adjustment 0. I Are referencetransformer T21 connections correct and secure on Are generator output leads properly connected? SeeTESTN. I Y= can be damagedby malfunctioning com- Replace the regulator PC board per procedure E. the new PC board unfil all other problems have been locafed and corrected. 1-1 Contact with high voltage can cause severe personal injury or death. Do nof touch any exposed wiring or componentswifh anypart of the body, clofhing, fool orjewelv. Do nof use non-insulated fools inside fhe confml. Stand on an insulafing mat or dry wood platform when fhe control doors are open. I 3 Redistribution or publication of this document, by any means, is strictly prohibited. FLOW CHART D. FIELD BREAKER TRIPS STMT Check exciter stator winding per TEST G. Replace if bad. Check reference transformer T21 per TEST E. b w ( Contact with high volfage can cause severepersonal injury or death. Do nof touch any exposed wiring or components withanypart of the body,clothing, tool orjewely. Do not use non-insulated tools inside the control. Stand on an insulating mat or dry wood platfonn when the control doors are open. FLOW CHART E. UNBALANCED GENERATOR OUTPUT VOLTAGE START output still unbalanced? no Check for correct grounding of genetator and load. I I Are generator leads connected and arounded Drmerhf? See Procedure N. Are genetat6 &or winclingscontinuous perTESTJ? no Correct as necessary. I Replace stator assembly. I I as necessary. 1- ponents within thecontrol, Do notinstall Conbcfwith high voltagecan cause severe personal injury or death. Do not touch any exposed wiring or components withanypart ofthebod& clothing, tool orjewelry, Do not use non-insulated tools inside the confrol. Sfand on an insulating mat or dry wood platform when the control doors are open. 4 Redistribution or publication of this document, by any means, is strictly prohibited. The commutating reactor is shown in Figure 1. It is called CMR21 on the schematics, and is located inside the voltage regulator housing (mounted near the generator; see Installation and Operator's Manuals). Only one winding of the reactor (leads 1 and 2) is usedon this model. Disconnect propulsion engine battery cables, negative (-) lead first Then remove reactor leads from the terminal board for testing. GENERATOWREGULATOR TESTS General All the following adjustments and tests can be performed without disassembling the generator. They should be used for testing generator regulator components in conjunction with the troubleshooting flow charts earlier in this supplement - Resistanceacross leads 1 and2 should be 330 to 390 milliohms at 77" F (25"C). Resistance between the winding and the reactor frame should be infinity. A Testing AC Residual Voltage Test for residual AC voltage if there is no AC power output from the generator. Disconnect propulsion engine battery cables, negative (-) lead first, before connecting test leads to generator leads 1 and 2. Reconnect battery cables, positive (+) cable first, start the engine, PTO and generator and operate at normal speed. 1-1 Accidental sfarting of the generator can cause severe personal injury or death, Disconnect the propulsion engine batterycables,negative (-)lead firs& before connecting test leads to the controls or generator. II Check voltage between generator leads 1and 2 while the set is running (see the schematic diagram included later in this supplement). Use extreme caution when performing this test (see warning, below). Residual voltage should be 5 to 10 VAC. FIGURE 1. COMMUTATING REACTOR - C Flashing the Field If output voltage does not build up, it may be necessary to restore residual magnetism by flashing the field. Assemble a 12 volt storage battery, 10 amp fuse, momentary-on switch, and diode as shown in Figure 2. 1-1 Contact with high volfagecan cause sevee personal injury or death. Do not touch any exposed wiring or components with any part of the body, clothing, tool or jewelv. Do not use non-insulated foolsinside the conirol. Sfand on an insulating mat or dry wood platformwhen the control doors are open. B ;i Disconnect propulsion engine battery cables, negative (-) lead first, before connecting field flashing leads. Connectthe positive leadtothe FI (+) exciter stator lead, and the negative lead to the F2 (-) exciter lead. Reconnect battery cables, positive (+) cable first, then start the engine, PTO and generator and operate at normal speed. Close the switch just long enough for the generator output voltage to build up. - Testing Commutating Reactor 1-1 Accidental sfarfingof the genlncorrecf flashing procedure erator can cause severe personal injury or 1 death. Disconnect the propulsion engine can damage the voifage reguhtor. Do not keep excitation circuitry connecfedlonger baftery cables,negative(-1lead first,before than 5 seconds. beginning this test. 5 Redistribution or publication of this document, by any means, is strictly prohibited. 1- [BWARNINGI Accidenial starting of the generator can cause severe personal injuty or Contact with high voltage can cause severe personal injury or deafh. Do not fouch any exposed wiring or componenfs with any part of the body, clothh?g, tool or jewelry. Do not use non-insulated fools inside the confrol. sfand on an insulating maf or dry wood plaffonn when the control doors are open. death. Disconnect the propulsion engine battery cables, negative (-)lead first, before disconnecting the reference transformer for resisfance tesfing, MOMENTARYaN SWITCH > H1 "'W " 12AMP300V FIGURE 3. REFERENCETRANSFORMER - E VR21 Replacement Use the following procedure for replacing the voltage regulator PC board or VR chassis. 1. Stop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. FIGURE 2. FIELD FLASHING CIRCUIT 1-1 Accidenfal sfarfing of ihe genemtor can cause severe personal injury or deafh. Disconnect thepropulsion enginebatfery cabies, negative (-1 lead first, before conflnulng with this PC board mplacement procedure2. Open the voltage regulator housing. Disconnect the regulator and if necessary, label wires. Refer to the AC control wiring diagram included later in this supplement. 3. Remove four screws at comers of the PC - D Testing Reference Transformer Reference transformer T21 is located inside the voltage regulator housing, mounted near the generator. T21 h a s four leads;two primary leads marked HI and H2 and two secondary leads marked X i and X2. See Figure 3. Stop the engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. Disconnect transformer T21 leads and make resistance readings. The resistance of either coil should be IO0 ohms f10%at 75" F (25" C). Resistance between leads and transformer frame should be infinity. board to remove it. 4. Install new PC board; secure with four screws. 5. Reconnect wires removed in step 2 at proper terminals. 6 Redistribution or publication of this document, by any means, is strictly prohibited. t 6. Reconnect battery cables, positive (+) cable first. Start the engine and PTO and set voltage as outlined in test (M), Voltage Adjustment. - F Testing Rotating Rectifiers Two different rectifier assemblies make up the rotating rectifierbridge assembly, Figure 4. Using an accurate ohmmeter,test each CR using negative and positive polarities. Test rectifiers as follows: 1. Stop engine and PTO unit. Disconnect FIGURE 4. TESTING ROTATING RECTIFIERS leads to engine starting battery, negative (-) lead first. - G Testing Exciter Stator IBWAR"G1 Accidental starting of the Test the exciter stator (Figure 5) for open or shorted windings and grounds as follows: generator can cause severe personal injury or death. Disconnect the propulsion engine battery cables, negative (-) lead firsf, before continuing with this test procedure, Testing forOpen or Shorted WindingsStop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. 1- Accidental stafiing of the generator can cause severe personal injury or death. DIsconnect tlte propulsion engine batterycables, negative (-)lead first,before continuing with this test procedure. 2. Disconnect all leads from assembly to be tested. 3. Connect one test lead to F1+ stud and connect other lead to CRI ,CR2, and CR3 in turn; record resistance value of each rectifier. DisconnectF1+ and F2-exciter field leadsfrom terminal block in generator end bell. The resistance between field leads should be 12.4 ohms rt 10% at 77"F (25"C). 4. Connect one lead to F2- stud and connect other lead to CR4, CR5 and CR6 in turn; record resistance value of each rectifier. 5. Reverse ohmmeterleadsfrom steps2 and 3 and record resistance value of each rectifier F1+to CRI ,CR2, and CR3 and F2-to CR4, CR5, and CR6. Testing forGrounds: Stop engine and PTO unit. Disconnect leads to engine starting battery, negative (-) lead first. 1-1 Accidental starling of the gem erator can cause severe personal injury or death. Disconnect fhepropulsion engine battery cables, negative (-1 lead first, before continuing with this test procedure. 6. All the resistance readings should be high in one test and low in the othertest. If any reading is high or low in both tests, rectifier assembly is defective. Connect ohmmeter between either field lead and exciter stator laminations. Use ohmmeter set at the highest, resistance range. Resistance must be one megohm (1,000,000 ohms) or greater. Use 23 to 26 inch-lbs (26 to 2 9 Nom) torque when replacing nuts of Fl+ and F2-, CR1, CR2, CR3, CR4, CR5 and CR6. 7 Redistribution or publication of this document, by any means, is strictly prohibited. The preferred test is with a megger or insulation resistance meter that applies 500 VDC or more to the test leads. Readings should be 100,000 ohms or greater. Accidental starfing of the generator can cause severe personal injury or death, Disconnect the propulsion engine battery cables, negafive(-)lead first, before continuing with these test procedure. Test the exciter rotor (Figure 6) for open or shorted windings or grounds as follows: Testingfor Open orshorted Windings:U s e awheatstone bridge ordigital VOM forthis test. Disconnect main rotor field leads which connect to rotating rectifier assemblies at F1+ and F2-. Disconnect lead wires from diodes CR1, CR2, CR3, CR4, CR5 and CR6. Test between exciter lead pairs TI-T2, T2-T3, and TI-T3. Resistance at 770F (25" C) should be 645 mil- F1, F2 LEADS liohms f 10%. Testing for Grounds: Connect leads of ohmmeter between any CR lead and exciter rotor laminations. Use an ohmmeter set at the highest resistance range. An ohmmeter reading less than one megohm (1 ,OOO,OOO ohms) indicates defective ground insulation. The preferred test is with a megger or insulation resistance meter that applies 500 VDC or more to the test leads. Be sure all exciter leads are disconnected from the diodes. Readings should be 100,000 ohms or greater. . WHEATSTONE BRIDGE OR DIGITAL OHMM€IER FIGURE 5. MEASURING EXCITER STATOR RESISTANCE - H Testing Dciter Rotor Stop engine and PTO unit. Disconnect leadsto engine starting battery, negative (-) lead first. 8 Redistribution or publication of this document, by any means, is strictly prohibited. ~~ ~ ~~ ~ EXCITER ROTOR . MEGGER OR INSULATION RESISTANCE METER WHEATSTONE BRIDGE OR DIGITAL TESTING WINDING FORGROUNDS OHMMRER TESTlNG WINDING RESISTANCE ES-17oOs CONNECTION DIAGRAM ~ ~ FIGURE 6. TESTING EXCITER ROTOR - diagram. All stator leads must be isolated for testing. J Testing Generator Stator Stopengine and PTO unit. Disconnect leads to engine starting battery, negative (-} lead first. Use a megger or insulation resistance meter which applies 500 VDC or more to the test leads. Test each stator winding for a short to the laminations. A reading less than 100,000 IBWAR"GI Accidenfal sfarfing of the gen- erator can cause severe personal injury or death, Dlmnneci ihe pmpulsion engine baiierycables, negative(-)lead firs$before continuing wifhthese fest procedure. ohms indicates a questionable stator. Thoroughly dry the stator and retest. Testing for Open or Shorted Wlndings:Test for continuity between coil leads shown in Figure 7:wire pairs TI -T2and T3-T4 should have equal resistance. U s e an accurate instrument for this test such as a Kelvin bridge or digital ohmmeter. Resistance values at 77" F (25"C) Using proper test equipment, check the stator for grounds, opens, and shorts in the windings. Testing for Grounds:Some generators have ground connections tothe frame. Checkwiring 9 Redistribution or publication of this document, by any means, is strictly prohibited. are given in Table 1 (lead length between 0 and 15 feet). TABLE 1. STATOR RESISTANCE VALUES IN OHMS, f 10% If any windings are shorted, open or grounded, replace the stator assembly. Before replacing the assembly, check the leads for broken wires or insulation. kW RATING RESISTANCE 12/15 .115- .I47 16/20 .069 - -091 20124 -0% - .072 24/30 -033- .043 30135 -029- .038 n I . . .... t.1.. w I ESl79SS WHEATSTONE RESISTANCE MRER BRIDGE FIGURE 7. TESTING STATOR WINDINGS 10 Redistribution or publication of this document, by any means, is strictly prohibited. - K Testing Generator Rotor TABLE 2. ROTOR RESISTANCE VALUES IN OHMS,k 10% Stopengine and PTO unit. Disconnectleads to engine starting battery, negative (-) lead first. RESISTANCE (ohms) kW RATING 16/20 LaWAR"i;l Accidental starting of the generator can cause severe personal injury or death. Disconnect &e pmpulsion engine bafterycables, negative (-)lead firsf, before continuing with these test procedure, 20124 I 24130 I ~ I I 2.24 2.91 30135 For these tests, use a megger or insulation resistance meterwhich applies500 VDC or more to the test leads. MEGGER OR ~ Testing for Grounds: Check for grounds between each rotor lead and the rotor shaft, Figure 8. Perfom tests as follows: INSULATION RESISTANCE MElER ~ 1. Remove rotor leads F1+ and F2- from the rotating rectifier assemblies. 2. Connect test leads between F1+ and rotor shaft. Meter should register 100,000 ohms or greater. 3. If less than 100,OOO ohms, rotor is questionable. Thoroughly dry the rotor and retest. TESTING WINDING FOR GROUNDS . CA-lOlO-12S FIGURE 8. TESTING ROTOR FOR GROUNDS 4. Replace a grounded rotorwitha new identical part. DIGITAL (7-7 r -1 I Testing for O p n or Shorted Windings:Perform tests as follows: 1. Remove rotor leads F1-t and F2- from rotating rectifier assemblies. 2. Using ohmmeter, check resistance between Fl and F2 leads, Figure 9. The resistance values at 77" F (25" C) should be as shown inTable 2. If not, replace defective rotor with new, identical part. TESTING WINDING RESISTANCE CA1QIO.S FIGURE 9. TESTING ROTOR FOR AN OPEN CIRCUIT Redistribution or publication of this document, by any means, is strictly prohibited. - L Wiring Harness Check Stop engine and P i 0 unit. Disconnectleadsto engine starting battery, negative (-) lead first. 1- Accidental starting of fhegenerator can cause severe personal injury or death. Disconnect the propulsion engine bafieryc&les, negative (-1lead first,before continuing with these iesi procedure. 1Contacf wifh high voltage can cause severe personal injury or death. Do not touch any exposed wiring or componenfs with any part of the bod% clothing, tool or jewelry. Do nof use non-insulated tools inside the control. Sfandon an insulaiing mat or dry wood plaffonnwhen the control doors are open. With the generator running, set the voltage ad- just potentiometer on the regulator board assembly for correct voltage. See Figure 10. Carefully check wiring harnesses as follows: I 1. Inspectall wires for breaks, loose connections, and reversed connections. Refer to the wiring diagrams at the end of this supplement. 2. Remove wires from terminals at each end and using an ohmmeter, check each wire end to end for continuity or opens. 3. Using an ohmmeter, check each wire against each of the other wires and to ground for possible shorts or insulation breaks under areas covered by wrapping material. 4. Reconnect or replace wires according to the wiring diagrams at the end of this supplement. I 0 I - M Voltage Adjustment When checking output voltage, be surethat the generator has stabilized and is running at the correct speed (frequency). 0 VOLTAGE ADJUST FIGURE 10. VOLTAGE REGULATOR BOARD INSIDECONTROL BOX - N Reconnection Accidental starting of ihe generaforcan cause severe personal injury or death, Dlsconnecf fhepropulsion engine bafferycables, negative(-)lead first,before connecting test leads to the controls or generator. . Generator reconnectionconforms to AC wiring diagram 612-6678, supplied in this supplement. Also see the Installation Manual for output connection and generator reconnection guidelines. 12 Redistribution or publication of this document, by any means, is strictly prohibited. . STUD ON BOTTOM OF BOX (UNGROUNDED) T I I I I I I 1 I I I TO , 1 LOAD LO L2 I I TO GENERATOR T2, T3 TI- I I @-@ I T4- I z M3 I I I L M4 I METER-FREQUENCY METER-AC VOLT 12/15 KW GENERATOR METEWBREAKER PANEL SCHEMATIC DIAGRAM NO. 615-0426 REV. A MODIFIED 13 Redistribution or publication of this document, by any means, is strictly prohibited. T - - __ CT2 I I I m __I !I I A I 13 I LU 7L1 I I I II I I I I I I I I I I TO GENERATOR INSIDE VIEW OF CONTROL B O X -- - - -- - - - - -- - I It! 7 (‘I TT M4 II t I -1 I I I I -I I I I I I I I I I I I REAR VIEW 7 TERMINAL BLOCK 6 CIRCUIT BREAKER 5 TRANSFORMER-CURRENT TB 1 CB I METER-FREOUENCY 3 METER-TIME TOTALIZING 2 METER-AC VOLTAGE I \METER-AC AMMETER 4 ITEM^ DESCWPTION OR MATERAL CT1 , CT2 M5 M4 M3 . / M I .2 RF DES 16/20,20/24 KW GENERATOR METENBREAKER PANEL SCHEMATIC DIAGRAM NO. 615-0427 REV. A MODIFIED 14 Redistribution or publication of this document, by any means, is strictly prohibited. Redistribution or publication of this document, by any means, is strictly prohibited. Redistribution or publication of this document, by any means, is strictly prohibited. TABLE OF CONTENTS . TITLE PAGE .................................................. ................................................................... ................................................ ................................................. ................................................. .......................................................... .................................. ............................ Safety Precautions .Inside Cover Introduction 2 GENERATOR TROUBLESHOOTING ............................................ 5 Part 1 4.5 to 25 kW Range 5 Part II 25 to 30 kW Range 21 Generator Repair. J-Series 35 Disassembly 35 36 Assembly PTO ALTERNATORS 37 .. Specifications 38 Wiring Connections, 15-25 kW 40 Troubleshooting 41 Service and Maintenance 42 TWO BEARING ALTERNATORS ................................................ 43 . Specifications : 45 Troubleshooting i 46 Alternator Repair 47 Gear Case Disassembly 47 Alternator Disassembly 49 Alternator Assembly 54 CONTROL SYSTEMS 55 Engine Control System Operation 58 Gasoline Powered Sets 58 Diesel Powered Sets 58 Radiator Cooled Sets 62 Engine Control Troubleshooting 67 Control Component Checkout 70 WIRING DIAGRAMS ; 72 .......................................................... ............................................................. ............................................. .. ........................................................... ................................................... .................................... ........................ .................................... ..................... .......................................................... ................................................ ................................................ ................................................... ......................................................... .......................................... ................................................ ................................................... .................................................. ............................................ ............................................. .......................... ............................... .' T O AVOID POSSISLE PERSONAL INJURY OR EQUIPMENT DAMAGE. A QUALIFIED ELECTRICIAN OR A N AUTHORIZED SERVICE . REPRESENTATIVE MUST PERFORM INSTALLATION AND ALL SERVICE. .1 Redistribution or publication of this document, by any means, is strictly prohibited. INTRODUCTlON GENERAL winding resistances being different from the This manual contains troubleshooting and repair procedures for the YD generators and controls.. majority of generators. 2. The "UR" regulation system is used rather than the standard YD regulator. The YD generator information includes description, troubleshooting,adjustments and tests for repairing the generator, exciter and voltage regulator. The generator set models affected by the above modifications include: 25 kW MDTNDTA'generator sets 30 kW SK generator sets 30 kW YD PTO generators . ' Engine information is in the applicable engine manual. Three systems which could cause the electric generating set to malfunction are the generator, the control and the engine. The majorsection of this manual appliesto most, but not all, YD generators. In the development of larger capacity generators in the YD family, Onan has included some modifications so that the generator would have adequate motor-starting capability. Separate sections of this manual should be referred to for information on these models which is different from that provided i n the main body of the manual. These modificationsinvolvetwo basic areas: 1. The rotating exciter (rotorand stator) is about 112 inch thicker than standard. This results in the The Controlsystem informatipn includes description and troubleshooting procedures for repairing the set if the trouble is in starting, stopping,or if thesetshuts down because of an emergency condition. MANUAL REFERENCE FOR YD GENERATOR SETS AND ALTERNATORS k JB JC '' MJC I RJC JC MJC RJC SK DJC MDJC RDJC MDJF RDJF MDTA DTA YD PTO Alternator YD Two Bearing I 60 Hz 7.5 12.5 10.0 12.5 15.0 15.0 15.0 30.0 50 Hz 6.0 6.0 6.0 7.5 12.0 120 15.0 15.0 17.5 25.0 25.0 15.0-30.0 5.0-20.0 4.5 4.5 6.0 9.0 10.0 12.5 12.0 14.5 Diesel DJB DJE MDJE STATOR STACK LENGTH 10.0 12.5 125 25.0 2.88 4.31 3.44 4.31 . 5.00 5.00 4.31 : '7.00-10.38 , . . x 15.0-30.0 5.0-16.0 2.19, 2.19' 2.88 4.31 4.31 5.00 5.00 5.75 8.62 8.62 5.00-8.62 2.197-00 2 PARTS CATALOG 967-0223 967-0220 968-0340 974-0220 967-0220 968-0340 974-0220 946-0220 967-0221 967-0225 968-0224 967-0222 968-0222 974-0221 968-om 974-0222 961-0222 961-0220 929-0002 929-0004 OPERATOR'S MANUAL *' - .. . 967-0123 967-0120 968-0340 974-0120 967-0120 968-0340 974-0120 946-0120 967-0121 967-0125 968-0120 967-0122 968-0122 974-0121 968-0121 974-0122 961-0122 961-0120 929-0002 929-0004 Redistribution or publication of this document, by any means, is strictly prohibited. Onan Multitester Typical wiring diagrams are Includedat the end of this manual to helppersonneltraceor isolateproblems. Onansuggests,however, that service personnel use the wiring diagrams shipped with the units. I .a. Wheatstone Bridge Kelvin Bridge Jumper Leads Onan Load Test Panel Variac AC Voltmeter DC Voltmeter See Tool Catalog 900-0019. Repair information is not extensive because the solid-state printed circuit boards lend themselves more to replacement that repair. ONAN does not recommend repair of the printed circuit boards, except at the factory and has initiated a return/ exchange service obtainable through distributors, whereby faulty printed circuit boards can be returned and exchanged for good units. For more information, contact your Onan distributor. GENERATOR DESCRIPTION The YD generators (Figure 1)are four-pole,revoiving field, brushless exciter, reconnectiblemodels of dripproof construction. Design includes both single and three-phase, 60 and 50 hertz type generators. The generator rotor connects directly to the engine crankshaftwith a tapered shaft and key. It is fastened by the rotor-through-stud which passes through the rotor shaft and a nut on the outside of the end bell. A centrifugal blower, on the front end of the rotor shaft, circulatesthe generatorcooling air which is drawn in through the end bell cover and discharged through an outlet at the blower end. Application of meters or high heat soldering irons to printed circuit boards by otherthan qualified personnel can result in unnecessaryandexpensive damage. High voltage testing or high potential (or Megger) testing of generator windings can cause damage to solid state components. Isolate these components before testing. TEST EQUIPMENT Most of the test procedures in this manual can be performed with an AC-DC multimeter such as a Simpson Model 260 VOM. Some other instruments to have available are: A ball bearing in theend bell supportstheouterend of the rotor shaft. The end bell and generator stator housing are attached by four-through-studs which pass through the stator assembly to the engine- ENGIN€CENEf ADIAPTER THROUGH-STUD FIGURE 1. TYPICAL YD J-SERIES GENERATOR (SECTIONAL VIEW) 3 Redistribution or publication of this document, by any means, is strictly prohibited. generator adapter. The brushless exciter stator mounts in the end bell while the exciter rotor and its rotating rectifier assemblies mount on the generator rotor shaft. Generator sets without a control panel or switchboard containing A C instruments such as voltmeters, ammeters, running time meter, frequency meters, and line circuit breakers are shipped from the factory with the A C output leads separated in the output box. On generator sets with switchboards containing A C instruments, the A C output leads are wired as specified on the customer's purchase order to deliver only the voltage specified. All generators have four wires extending from the stator housing in addition to the A C output leads, Figure 2. Lead B2is from the battery charge winding and connects to terminal 7 of the engine control. Lead F1+ and F2-are from the exciter field winding and are connected to the output terminals of the voltage regulator. Leads 1and Pare connected to the stator windings and provide reference voltage and input powerto thevoltage regulator. These four leads are connected at the factory. VOLTAGE RECONNECTION WITH OPTIONAL INSTRUMENTS The optional A C instruments on the control panel (such as voltmeters, ammeters, transformers, and running time meters) are intended for use with specific nameplate voltages. Control components may have to be changed to match new current ratings when field reconnection for other voltage codes or voltages are made. Figure 2 is a composite illustrationshowing four output leadsfor single-phase units, l2output leadsfor *phase broad rangeunits, and four output leadsforcode9x3-phase 347l600volt generators. CHARGING BAlTERY CHARGING RESISTOR a To prevent instrument damage contact the Onan factory for required instrument changes, new wiring diagrams, new plant nameplate with proper specificationnumber and voltagebeforeattemptingto reconnecta generator with instrumentson the control panel. TO ENGINE CAUT,ON -CONTROL 1 r TO VOLTAGE REGULATOR 7 F 7 2 - n Under no circumstancesshall the generator be connected in any other mannerthanshown in the applicable wiring and reconnection diagrams. Severe damage will result if leads are incorrectly connected or improperlyinsulated. Use extreme care in checkingleadsto assure proper connections. . FIGURE 2 SINGLE AND THREE PHASE GENERATOR SCHEMATIC (COMPOSITE) GENERATOR OPERATION Operation of the generator involves the stator, voltage regulator, exciter field and armature, a full wave bridge rectifier, and the generator rotor, Figure 3. Residual magnetism in the generator rotor and a permanent magnet embedded in one exciter field pole begin thevoltage build-up processasthe generator set starts. Single-phase AC voltage, taken from one of the stator windings, is fed to the voltage regulator as a reference for maintaining the generator output voltage. AC voltage is converted to DC by a silicon controlled rectifier bridge on the voltage regulator printed circuit board and fed into the exciter field windings. The exciter armature producesthreephase AC voltage that is converted to DC by the rotating rectifier assembly. The resultant DC voltage excites the generator rotor winding to produce the stator output voltage for the AC load. The generator rotor also produces AC voltage in the charging winding of the stator which is converted to direct current for battery charging. h FULL WAVE BRIDGE RECTI FIER I RESIDUAL . MAGNETISM IN ROTOR STARTS REFERENCE VOLTAGE ROTOh B RUSHLESS EXCITER FIELD I ' FIGURE 3. EXCITATION BLOCK DIAGRAM 4 Redistribution or publication of this document, by any means, is strictly prohibited. - GENERATOR TROUBLESHOQTING PREPARATION PART I A few simple checks and a proper troubleshooting TROUBLESHOOTING procedure can locatethe probable source of trouble and cut down service time. Check all modifications, repairs, replacements performed since last satisfactory operation of set to ensure that connection of generator leads are correct. A loose wire connection, overlooked when installing a replacement part could cause problems. An incorrect connection, an opened circuit breaker, or a loose connection on printed circuit board are all potential malfunction areas to be eliminated by a visual check. Unlessabsolutelysure that panel instrumentsare accurate, use portable test meters for troubleshooting. Visually inspect components on VR21. Look for dirt, dust, or moisture and cracks in the printed solder conductors. Burned resistors, arcing tracks are all identifiable. Do not mark on printed circuit boards with a pencil. Graphite lines are conductive and can cause leakage or short circuits between components. PROCEDURES (STANDARD YD GENERATOR AND REGULATOR) The information in this section is divided into Flow Charts A, 6,C, D, and E as follows: A. NO AC OUTPUT VOLTAGE AT RATED ENGINE RPM. B. UNSTABLE OUTPUT VOLTAGE, ENGINE SPEED STABLE 1800 RPM. C. OUTPUT VOLTAGE TOO HIGH OR LOW. D. EXCITER FIELD BREAKER TRIPS. E. UNBALANCED GENERATOR OUTPUT VOLTAGE. The PART I TROUBLESHOOTING PROCEDURES are for YD generators in the 4.5 to 25 kW size range using the standard YD regulator and generator. To troubleshoot a problem, start at upper-left corner of the chart related to problem, and answer all questions either YES or NO. Follow the chart until the problem is found, performing referencedAdjustment and Test procedures following the Flow Charts. The PART I1TROUBLESHOOTING PROCEDURES (page 21) are for YD generators inthe 25 to 30 kW size range. These units have thicker exciters and use the UR type regulation system. Referenced components in the Flow Charts and Adjustment and Test procedures can be found on the electrical schematic Figure 4, and on assembly drawings and wiring diagrams on pages 18-20. DC OUTPUT VOLTAGE VOLT. REG. PC BOARD VR21 " EXCITER ROTOR (M,M E ) RECTIFlER ASSEMBLIES REGULATOR ASSEMBLY FIGURE 4. ELECTRICAL SCHEMATIC, STANDARD YD GENERATOR AND REGULATOR 5 Redistribution or publication of this document, by any means, is strictly prohibited. FLOW CHART A. NO BUILD UP OF AC OUTPUT VOLTAGE Remove one lead from breaker and check continuity with ohmmeter. Is breaker open? Is control panel field breaker CB21 ON? Replace defective field breaker. If voltage is unstable, high or low, or causes breaker to trip, see Flow Charts B, C, or D. Push to reset breaker. Does generator AC output voltage build up? Is reference voltage across TB21-1 & 2 20 VAC or more? Flash exciter field per TEST [E]. Does generator output voltage build up? -no I no Disconnect stator leads 1& 2 from TB211 & 2. Is reference voltage across leads 20 VAC or more now? Check commutating reactor CMR21 per TEST [I].Replace if bad. I 1 Check diodes CR1 through CR6 on rotor per TEST [F]. Replace if bad. Check reference transformer T21 per TEST [J]. Replace if bad. I I Check wiring harness W9 for shorts per TEST [O].Replace bad wiring. Is exciter field voltage across TB21-3 & 4 7.0VDC Check wiring harness W9 for opens per TEST [O]. Replace bad wiring. d I Check exciter rotor winding per TEST [L]. Replace if bad. I I I Check exciter field winding per TEST [K].Replace if bad. Check SCRs CR13 & CR16per TEST [HI. Replace if bad. I Check generator stator windings per TEST [N].Replace Check diodes CR12,14 & 15 per TEST [GI.Replace if bad. I I Replace voltage regulator PC board per procedure IP]. , Check generator rotor field winding per TEST [MI. Replace if bad. 1 I Do not replace the printed circuit boarduntil thetroublenot on the PC board has been located and corrected to avold damage to new PC board. 6 Redistribution or publication of this document, by any means, is strictly prohibited. I FLOW CHART B. AC OUTPUT VOLTAGE BUILDS UP, BUT I S UNSTABLE Are there any broken wires or loose connections on voltage regulator assembly V R Z ? + -Yes Repair as required. I no 1 I I 1 L Repair wiring or replace as required. 1 I I I t Check wiring harness from VR22 to end bell per TEST [O]. Check OK? I I I Does adjustment of Dampening Control R27 on VR21 per adjustment [B]result Is voltage stable within spec at no load to full load range of generator set? no no Replace voltage regulator PC board per procedure [PI. Do not replace the printed circuit board _ _ ~ _ _ ~ _until ~ the _ trouble not on the PC board has been located and corrected to avoid damage to new PC board. I FLOW CHART C. AC OUTPUT VOLTAGE BUILDS UP, BUT IS HIGH OR LOW START Set RPM per instructions in appropriate engine manual. -no-+ Is engine running at correct RPM? Does adjustment of Voltage Adjust control R22 on VR22 result in correct output voltage? i Set control per Voltage Calibration Adjustment [A]. Is jumper wire W10 connected correctly on VR21 for desired voltage? See Figure 19 on page 20 and correct if needed. * Replace voltage regulator PC board VR21 per procedure [PI. Do not replace the printed circult board until the trouble not on the PC board has been located and corrected to avoid damage to new PC board. I Are generator output leads properly connected? See Figure 19and correct if needed. F 7 I I Redistribution or publication of this document, by any means, is strictly prohibited. FLOW CHART D. AC OUTPUT VOLTAGE BUILDS UP, BUT FIELD BREAKER TRIPS Does AC output voltage build up to 140%or more of rated voltage before breaker trips? Check for any loose or broken wires or connections on VR22 assembly. no I Check exciter rotor winding per TEST [L]. Replace if bad. f Check generator stator leads for proper connection. See Figure 19, page 20. I I * Checkgenerator rotor field winding per TEST [MI.Replace if bad. I Check generator stator windings per TEST [N]. Replace if bad. Replace voltage regulator PC board VR21 per procedure [PI. D O nOt replam the printed CiEUit board until the trouble not on the PC board has been locatedand corrected to avoiddamage to new PC board. .* 8 Redistribution or publication of this document, by any means, is strictly prohibited. FLOW CHART E. UNBALANCED GENERATOR O U T P U T VOLTAGE Are generator leads connected and grounded properly? See Figure 19, page 20. ---no+ Correct as necessary. Is generator stator winding continuous per TEST [K]? -no- Replace stator assembly. r- 1 Check load for ground faults and correct as necessary. 9 Redistribution or publication of this document, by any means, is strictly prohibited. ADJUSTMENTS AND TESTS (STANDARD YD GENERATOR AND REGULATOR) GENERAL diode CRl1, ammeter M11, to the battery, and to the ignition-fuel solenoid circuits. 1. The slide tap on adjustable resistor R21, located in the generator air outlet, should be set to give about 2 amperes charging rate, Figure 2. For applications requiring frequent starts, check battery charge condition (specific gravity) periodically and if necessary, increase charging rate slightly (slide tap nearer ungroundedlead) until it keeps battery charged: Having engine stopped when readjustingavoids accidental shorts. Avoid overcharging. . 2. If charge winding AC output is below: . a. 19 volts on 12 volt battery charge models, b. 38 volts on 24 volt battery charge models, c. 50 volts on 32 volt battery charge models, test the charging circuit for opens or grounds in the leads and charging winding. If leads are defective, replace them. If winding is defective,. replace generator stator. 3. If a separate automatic demand control for starting and stopping is used, adjust charge rate for maximum 4.5 amperes. This normally keeps battery charged even if starts occur as often as 15 minutes apart. All of the following Adjustments and Tests can be performed, without disassembly of the generator. They should be used for testing generator and regulator components in conjunction with the troubleshooting flow charts. . . VOLTAGE CALIBRATION ADJUSTMENT Thecalibration adjustmentis made using an accurate AC voltmeter to observe generator output voltage and to set the correct no loadvoltage. If voltage regulator VR21 printed circuit board has been replaced, it may be necessary to make a calibration adjustment. To obtain the correct output voltage, proceed as follows: 1. If set hasavoltageadjust potentiometer (R22) on the meter panel, set pointer halfway between minimum and maximum positions. 2. With unit running at no load, turn generator voltage potentiometer R26onVR21 (Figure 5) clockwise to increase output voltage; turn R26 counterclockwise to decrease output voltage. VOLTAGE REGULATOR CHECKOUT VOLTAGE STABILITY ADJUSTMENT The solid state voltage regulators (VR21) can be checked out on the bench for proper operation or location of faulty components. The following test equipment (one-each) is required fora proper checkout. Voltage stability is set at the factory, but if printed circuit board VR21 has been replaced or if damping potentiometer R27 has been unnecessarily adjusted it may be necessary to reset stability. Set stability as follows: 1. With generatorset running at no load, turn potentiometer R27 (Figure 5) to a position where voltage tends to be unstable or hunt. 2. Turn R27 clockwise slowly until voltage first stabilizes. This setting will result in stable voltage under all conditions in maximum voltage regulator response time. REF. DESIGNATION S CMR21 TEST EQUIPMENT Switch Reactor Fuse, 5 Amps Transformer, Variable 2 Amp 0-15OV Voltmeter, .DC f2% of Full Scale 3, Scale Q.50 and 0-15OV and 0-1OV Voltmeter, AC f2% @ lOVAC, 1%@ 150V .Resistor, 100-Ohm 400 W .Transformer, Input 315-0386 ........................................ .................................. F.. ................................. T1 V2 ........... ............ ... ..... ..................... V1 R1 T21 ................. Transformer T21 and reactor CMR21are a part of the voltage regulatorassembly (VR22orVR23);theseare the only parts obtainable with an Onan part number. The big 100-ohm 400 watt resistor (Rl) serves as the field during checkout. BATTERY CHARGE RATE ADJUSTMENT One generator winding supplies current for the battery charging circuit. The current flows through 10 I Redistribution or publication of this document, by any means, is strictly prohibited. Bench Check 3. Open switch in 120 VAC supply to VARIAC. 4. Piug VARIAC into 120 VAC source. 5. Proceed with checkout according to steps in Table 1. 1. Remove voltage regulator from unit according to procedure given for voltage regulator replacement. 2. Referring to Figure 5 and Table 1, connect test equipment to the printed circuit board VR21 terminals as follows: CONNECT Jumper Jumper Lead Lead Lead Lead AC Voltmeter DC Voltmeter VARIAC R1 [El FLASHING THE FIELD . FROM TO VR21-V1 VR21-1 VR21-V4 vR21-2 CMR21-1 CMR21-4 T21-X1 T21-X2 Across Across Across vR21-10 vR21-9 VR21-6 vR21-4 T21-H1 & H2 VR21-78 8 T21-H1 (fused) and H2 Across. VR21-7 h 8 . The following procedure is used for momentarily flashing the exciter field with a low voltage which restores the. residual magnetism in the alternator rotor. Flashing the field is usually necessary when installing a new brushless exciter stator wound assembly, but seldom is necessary under other circumstances. Always check generator residual voltage at terminals 1 and 2 to be certain whether or not flashing the field is necessary. Generator residual TABLE 1. VOLTAGE REGULATOR CHECKOUT . I1 (<=LESS THAN) Ac 1 mVOLT= toLIIsE "2 Dc (>= MORE THAN) OCCURS INCREASE W7 TO STABIL- r----------I WIOJUMPER , VOLT El AC INPUT VOLTMETER I '1 WioJuwER C k DAMPING a 0 7 0 I I I I v I VR21 L---------d I I FIGURE 5. VOLTAGE REGULATOR CHECKOUT EST EQUIPMENT CONNECTIONS 11 Redistribution or publication of this document, by any means, is strictly prohibited. 6 VOLT DRY CELL BATTERY ' . FIGURE 6. MSHlNGTHEFiELD - . 2. Connect one test lead to F1+ stud and connect other lead toCR1, CR2, and CR3 in turn; record resistance value of each rectifier. 3. Connect one lead to F2- stud and connect other lead to CR3, CR4 and CR5 in turn; record resistance value of each rectifier. 4. Reverse ohmmeter leads from step 2 and record resistance value of each rectifier F1+ to CR1, CR2, and CR3 and F2-to CR4, CR5, and CR6. 5. All three resistance readings should be high in one test and low in the other test. If any reading is high or low in both tests, rectifier assembly is defective. 6. Replace defective rectifier assembly with new, identical part. voltage should be at least 20 VAC at rated speed. If residual is too low and the output voltage will notbuild up, flash the field as follows: Locate terminals 7(-) and 8(+) on .voltage . regulator printed circuit board (VR21). Use a six volt dry cell battery with two clip leads anda12amp,300voltdiodeasshown in Figure6. If a six volt battery is not available, a 12 volt automotive battery can be used by adding a 20-ohm resistor in series; or a 24 volt automotive battery can be used by increasing the resistance to 40-oh ms. After starting engine, touch positive (+) battery lead to the+8, and negative (-) lead to -7 terminals . just long enough until voltage startsto build up or damage may occur to exciter-regulator system. 1-1 Use 24 Ibs-In. (27 N w ) toque when tightening nuts on F1+ and Be cautious when worklng on a generator that is running to avoid electricalshacks. F2-, CR1, CR2, CR3, CR4, CRS, and CR6. TEST PROCEDURES All o f the following tests can be petformed without disassembly of the generator. Use the following test procedures for testing generator components in conjunction with the troubleshooting charts. TESTING ROTATING RECTIFIERS Two different rectifier.gssembliesmake up the rotating rectifier bridge assembly, Figure 7. Using an accurate ohmmeter, test each CR using negative and positive polarities. Test rectifiers as follows: 1. Disconnect all leads fromassembly to be tested. FIGURE 7. TESTING ROTATING RECTIFIERS 12 Redistribution or publication of this document, by any means, is strictly prohibited. 5 CR13 CR12 R17 F2- F1+ EXCITER FIELD i I I I CR15 I FIGURE 9. TESTING DIODES 8 2. Using a &volt dry cell battery and a 200-ohm series resistor, observe correct polarity and connect battery leads to anode and cathode as shown in Figure 11. Observe polarityand connect a DC voltmeter across the 200 ohm resistor. The voltmeter should now read zero. Jumper anodeto gate: voltmeter should now read &volts. Remove jumper; voltmeter should still read &volts because the SCR remains turned on until voltage is removed from anode to cathode. 3. If the SCR does not pass eithertest, it is defective. Replace defective SCR with a new, identical part. FIGURE 8. SILICON CONTROLLED RECTIFIER BRIDGE [GI TESTING OUTPUT BRIDGE DIODES The output bridge rectifier diodes (Figure 8), CR12, CR14,and CR15, are located on the voltage regulator printed circuit board. Using an accurate ohmmeter, test diodes CR12, CR14, and CR15 as follows: 1. Connect one ohmmeter lead to each end of diode and observe resistance reading, Figure 9. 2. Reverse ohmmeter leads and again observe resistance readings. OHMMETER A good diode has a higher reading In one direction than the other. If both readings are high, or low, diode is defective. 3. Replace defective diodes with new, identical parts. TESTING SCR'S Two identical silicon controlled rectifiers (SCR's), CR13and CR16, control the DC output voltage to the exciter field. These SCR's are mounted in heat sinks on the voltage regulator and are tested as follows: 1. Using high scale on ohmmeter, connect ohmmeter leads to anode and cathode of the SCR as shown in Figure 10. The resistance reading should be one megohm or greater. Reverseohmmeter leads to anode and cathode; resistance should again be one megohm or greater. FIGURE 10. SCR RESISTANCE TEST 13 Redistribution or publication of this document, by any means, is strictly prohibited. X1, and X2. H1-H2 are the primary leads. Xl-X2 are the secondary leads. MULTIMETER LLkJ 1 TO 1 RATIO T21 x2 XI Resistance between H1-H2 should be 113 to 139 ohms, between Xl-X2 133 to 163 ohms at 77OF (25OC).Resistance between coils and from any terminal to transformer frame should be infinity. /KI TESTING BRUSHLESS EXCITER STATOR Like the generator, the brushless exciter stator (Figure 12) can be tested for open or shorted windings and grounds. Testing for Open or Shorted Windings: Disconnect Fl+ and F2- exciter field leads from ter- minal block in generator end bell. The resistance between field leads should be 10.98 to 13.42 ohms at 68" F (20' C). FIGURE 11. SCR VOLTAGE TEST 111 Testing for Grounds: Connect ohmmeter between either field lead and exciter stator laminations. Use ohmmeter set at RX 100 scale. An ohmmeter reading of less than infinity ( oc ) indicates defectiveground insulation. TESTING REACTOR The reactor assembly CMR21 leads are marked 1,2,3 and 4. Wires 1-2 and 3-4 are wound on the same iron core. 1 2' rn 3 . CMRPI 4 OHMMETER RESISTANCE BETWEEN F1 AND F2 SHOULD BE 10.98 TO 13.42 OHMS Resistance between 1-2 and 3-4 should be 0.33 to 0.39 o h m s and 0.38 to 0.46 ohms respectively at 77" F (25°C). Resistance between coils (e.g. 1-3) and from FIGURE 12 TESTING EXCITER FIELD any terminal to reactor frame should be infinity. [LI [Jl TESTING BRUSHLESS EXCITER ROTOR (ARMATURE) The brushless exciter rotor (Figure 13),can be tested for open or shorted windings, or grounds. TESTING REFERENCE TRANSFORMER The transformer T21 has four leads marked H1, H2, 14 Redistribution or publication of this document, by any means, is strictly prohibited. . OHWETER, I FI CONTACT ONE PROD TO EACH OF mE FLELD LEADS AND OTHER PROD TO ROTOR SHAFT. IF ROTOR IS GOOD, THERE WILL BE NO 0215 READING ON OHWlETER. FIGURE 14. TESTING ROTOR FOR GROUNDS FIGURE 13. TESTING EXCITER ARMATURE Testing for Open or Shorted Winding: All resistancevalues should be within rfr 10%ofvalues specified in Tables 2 and 4 at 77OF (25°C). Perform tests as follows: 1. Remove rotor leads F1+ and F2- from rotating rectifier assemblies. 2. Using ohmmeter, check resistance between F1 and F2 leads, Figure 15. Testing for Open or Shorted Windings: Use a Wheatstone Bridge for this test. Disconnect main rotor field leads which connect to rotating rectifierassemblies at Flcand F2-. Disconnect lead wires from diodesCR1, CR2, CR3, CR4, CR5and CR6. Test between exciter lead pairs T1-T2, T2-T3 and Tl-T3. . Resistanceshould be 0.5 to 0.6 ohms at 68OF (2OOC). Testing for Grounds: Connect leads of ohmmeter between each CR lead and exciter rotor laminations; use RX 100 scale on ohmmeter. An ohmmeter reading less than infinity (00) indicates defective ground insulation. If resistance Is low, there are shorted turns. If resistance is hlgh, rotor winding Is open. In either case, rotor must be replaced. 3. Replace defective rotor with new, identical part. OHMMETER - TESTING GENERATOR ROTOR For these tests, use an ohmmeter on RX 100 scale. Testing for Grounds: On brushless type generators, check for grounds between each rotor lead and the rotor shaft, Figure 14. Perform tests as follows: 1. Remove rotor leads F1+ and F2- from rotating rectifier assemblies. 2. Connect ohmmeter leads between F1+ and rotor shaft and between F2- and rotor shaft. Meter should not register. 3. If meter registers, rotor is grounded. 4. Replace grounded rotor with new, identical part. 8273 CONTACT ONE PROD TO ONE FIELD LEAD AND OTHER PROD TO OTHER FIELD LEAD. RESISTANCEVALUES ARE GIVEN IN TABLES 2 AND 4. FIGURE 15. TESTING ROTOR FOR AN OPEV CIRCUIT c 15 Redistribution or publication of this document, by any means, is strictly prohibited. Testing for Open or Shorted Windings: Test for continuity between coil leads shown in Figure 16; all parts should have equal resistance. Use an accurate instrument for this test such as a Kelvin Bridge. The proper resistancevalues for J-Series sets are given in Table 3 according to kW ratings and voltage codes. All resistances should be +: 10% of value shown at 68’ F (2OOC). Table 4 has resistance valuesfor PTOalternatorsin the 15-25 kWsize range. If any windings are shorted, open or grounded, replace the stator assembly. Before replacing the assembly, check the leadsfor broken wires or insulation. TABLE 2 RESISTANCE VALUES FOR ROTORS kW RATING AND MODEL 60 HERTZ 4.5 DJB 4.5 DJE 6.0 JB 6.0 MDJE 6.0 DJB 6.0 DJE 7.5 JB 7.5 MDJE 10.0 MJC 125JC 125 RJC 12.0 DJC 120 MDJC 15.0 JC 15.0 MJC 15.0 RJC 15.0 RDJC 15.0 MDJF 17.5 RDJF - - 9.0 DJC 10.0 MDJC 125 JC - 125 RJC 125 RDJC 120 MDJF 14.5RDJF RESISTANCE ~ 50 HERTZ ’ OHMS@2S°C(77V) - 245 2.50 245 2.50 276 - 282 276 - 282 2.05 - 2.09 2.30 - 235 230 - 2.35 230 - 2.35 230 - 2.35 250 - 255 250 - 255 250 - 2.55 250- 255 250 255 270- 275 - FROM KELVIN BRIDGE A/ THREEPHASEMODELS TEST BETWEEN WIRE PAIRS t TI-T4 T9-TI2 TESTING GENERATOR STATOR T7-TIO TZ-TS T3-Tb =TI1 . SlNGLE PHASE MODELS TEST BETWEEN WIRE PAIRS Using proper test equipment, check the stator for grounds, opens, and shorts in the windings. TI-T2 TST4 Testing for Grounds: Some generators have ground connections to the frame. Check wiring diagram. .Using an ohmmeter set at RX 100, test each stator winding for shorts to laminations. A reading less than one megohm indicates a ground. FIGURE 16. TESTING STATOR WINDINGS TABLE 3. RESISTANCE VALUES FOR STATORS kW RATING AND MODEL 50 Hertz 60 Hertz . 4.5DJB 4.5 DJE 6.0 JB 6.0 MDJE 6.0 DJB 6.0 DJE 7.5 JB 7.5 MDJE 10.0 MJC 12.5 JC 12.5 RJC 12.0 DJC 12.0 MDJC 15.0 JC 15.0 MJC 15.0 RJC 15.0 RDJC 15.0 MDJF 12.5 RDJF 9.0 DJC 10.0 MDJC 12.5 JC 12.5 RJC 12.0 RDJC 12.0 MDJF 14.5 RDJF I 18 518 3c 53c -695 .695 .460 .460 -761 .761 .498 .498 -360 -360 .224 -224 -485 .485 - -172 - .340 .303 -303 .303 .303 I 16 - .198 .198 .198 .143 I .294 - -120 .120 .120 -120 -087 -087 -087 .087 -087 -066 .260 .260 .198 .220 .220 -220 .220 .220 .162 -294 I - . .153 .153 -110 - .110 .110 .110 -089 I I Redistribution or publication of this document, by any means, is strictly prohibited. PI COl VR21 REPLACEMENT WIRING HARNESS CHECK Carefully check wiring harnesses as follows: 1. Inspect all wires for breaks, loose connections, and reversed connections. Refer to applicable wiring diagram. 2. Remove wires from terminals at each end and using an ohmmeter, check each wire end to end for continuity or opens. 3. Using an ohmmeter, check each wire against each of the other wires for possible shorts or insulation breaks under areas covered by wrapping material. 4. Reconnect or replace wires according to applicable wiring diagram. Use the following procedure for replacing the voltage regulator PC board. 1. Stop engine. 2. Disconnect and if necessary, label the following wires: 3, 4, 5 or 6,7, 8, 9, and 10. 3. Remove four screws at corners. 4. Remove used PC board. 5. Install new PC board; secure with four screws. 6. Reconnect wires removed in step 2 at the proper terminals. 7. Place jumper W10 at proper terminals for your particular voltage code and voltage connection. See Figures 17 and 19. 8. Perform Voltage Calibration and Stability Adjustment procedures [A] and [B]to obtain the correct generator output voltage and stability with new PC board in set. , TABLE 4. RESISTANCE VALUES FOR PTO ALTERNATORS OHMS Q 77'F VOLTAGE CODE ROTOR 3c 3c 2.77 - 2.35 2.70 2.75 20.0 kW $Phase 5D 2.70 2.75 25.0 kW l-Phase 3c 1.800 - 25.0 kW $Phase 5D 1.800 - PTO MODELS 15.0 kW l-Phase . 20.0 kW l-Phase 1 - 17 (25OC) STATOR 0.095 - .063 .076 -219 Tl-T2, T2-T3, Tl-T3 .142 T1-TO, T2-TO .248 T3-TO 0.095 0.170 Tl-T2, T2-T3, T3-Tl 0.106 Tl-TO, T2-TO 0.192 T2-TO Redistribution or publication of this document, by any means, is strictly prohibited. VOLTAGE REGULATOR The line-voltage regulator assemblies VR22 and VR23 On the J-Series generator Sets are solid state devices. Basic components are: Printed circuit board VR21 Voltage reference transformer T21 Commutating reactor CMR21 Field circuit breaker CB21 Voltage adjust rheostat R22 (Optional) ./ / Figure 17 shows the above components for typical control boxes. The electrical schematic and printed circuit board are shown in Figure 18. The voltage adjust control R22 is optional on either VR22 or VR23 voltage regulator. When R22 isased, it is connected between VR21-1 and VR21-3 (Figure 17) and the jumper between VR21-1 and VR21-2 is removed. REMOVE JUMPER WHEN OPTIONAL VOLTAGE ADJUST CONTROL IS USED \ WIO VR22 (W/O VOLT ADJ Y JVR23 (W/VOLT ADJ) - CB2 I .FEU) BREAKER VOLTAGE ADJUST (OPTIONAL) 8203 AIR-COOLED AND MARINE SETS C VR21 I-) L - / REFERENCE VOLTAGE TRANSFORMER N0TE:FIEU) BREAKER IS MOUNTED ON PANEL COMMUTATING REACTOR RADIATOR-COOLED SETS FIGURE 17. STANDARD YD VOLTAGE REGULATOR ASSEMBLIES . Redistribution or publication of this document, by any means, is strictly prohibited. REGULATOR SCHEluqnC DES. I DESCRIPTION Ref Voltare 721 I Transformer. R25 R24 R23 MSISTOR-FIU R22 RESISTOR IRESISTOR-FILY I RIB RIG " I, RESISTOR RfSIST(w FILM RESISTOR AI5 1 1 ' R14 R13 2 67K RESISTOR-IIRF WOUWO R9 RESISTOP RESISTOP am. t/n irom. 1/41 4Kn. ¶1 I R6 R5 RESISTOR-FILY RESISTOR R4 RES ISTOR 1/11 21.01. I/* I B K d IW 33n. I121 RESlSTllR . RESISTOR-FIW RI 1 . I2 AB 10 R7 42.2Rn. 1/41 48.4KlI. 1/4V Ion. Iln 2705 )r RM. 112W IOOKIl. 1 M 270M. IRI I.ZW. I/N 2 UE6n. i/n 3M. 1 / 2 1 R3 a3wn. RZ 220m. Rl nz I - rm 8787 om(1387 tin IO(Yllm9 1 TRANSISTOR-UIIIJUHCTION . I I -1-1 PRINTED CIRCUIT BOARD, VR21 RECTIFIER-GATE CONI IW CR5 cR3.4.6-I 11 RECTI FI ER-OI +aM-T 33KL 1/21 WE Id. 400V 0IO;E-ZEHER 2oY 5.w CAPACITOR .47MmlOW CAPACITOR 3YFO lYF0 NOTE: The 2500ohm external voltage adjust potentiometer connects between pin I and pin 3. See regulator schematic. If your set does not have an external voltage adjust potentiometer, pin I is jumpered to pin 2. z!i4& '.lUFOZSORI FIGURE 18. STANDARD YD REGULATOR PC BOARD 300-1540 1 19 Redistribution or publication of this document, by any means, is strictly prohibited. SCHEMATIC MAGRAM WIRING DIAGRAM CONNECT X I TO VRZI-5 FOR 50 HERTZ: CONNECT X I T O VR21-6 FOR 60 HERTZ GENERATORS. 5 240 y VI v2 v3 - J v4 LI VI v2 v4 VI v2 \R v4 h K A. 1A A VI T4 T7 R TI0 T5 T8 T I l7 T6 TI2 T3 TI1 T6 T9 T4 T I O R T8 T3 T9 T5 Tll ~~~ T I TI2 i2 u LI T I R L3 T 3 LO T O FIGURE 19. GENERATOR WIRING AND RECONNECTION DIAGRAMS 4.5 25 kW (CODE 5D PTO UNITS SEE PAGE 34) - 20 Redistribution or publication of this document, by any means, is strictly prohibited. Adjustment and Test procedures can be found on the electrical schematic Figure 20, and on assembly drawings and wiring diagrams on pages 32-34. PART II TROUBLESHOOTING PROCEDURES (YD GENERATORS USING UR REGULATOR) GENERATOR OPERATION * The information in this section is for generators used on 25DTA/MDTA series sets and the 30kW PTO and SKsets. Information is divided into Flow Charts, A, B, C, D and E as follows: The basic operation of the generator and AC controls involvesthestator, voltage regulator, exciter field and armature, afull wave bridge rectifier, and the generator rotor, Figure 20. Residual magnetism in the generator rotor and a permanent magnet embedded in one exciter field pole begin the voltage build-up process as the generator set starts running. Singlephase AC voltage, taken from the stator windings, is fed to the voltage regulatoras a reference voltage for maintaining the generator output voltage. The AC reference voltage is converted to DC by a silicon controlled rectifier (SCR) bridge and fed into the exciter field windings. The exciter armature produces three-phase AC.voltagethat is converted to DC by the rotating rectifier assembly. The resultant DC voltage excites the generator rotor winding to produce the stator output voltage for the AC load. NO AC OUTPUT VOLTAGE AT RATED ENGINE RPM. B. UNSTABLE OUTPUT VOLTAGE, ENGINE SPEED STABLE 1800 RPM. C. OUTPUT VOLTAGE TOO HIGH OR LOW. D. EXCITER FIELD BREAKER TRIPS. E. UNBALANCED GENERATOR OUTPUT VOLTAGE. A. ' To troubleshoot a problem, start at upper-left corner of the chart related to problem, and answer all questions either YES or NO. Follow the chart until the problem is found, performing referenced Adjustment and Test procedures following the Flow Charts. The SCR bridge is encapsulated in a hermetically sealed block. Therefore, if any diode or silicon controlled rectifier fails, the entire bridge has to be replaced. Referenced components in the Flow Charts and I ASSEMBLY I ES1067 FIGURE 20. ELECTRICALSCHEMATIC, YD GENERATOR WITH TYPE UR REGULATOR 21 Redistribution or publication of this document, by any means, is strictly prohibited. START Is control panel field breaker CB21 ON? no ti0 A I I Replace defective field breaker. and check continuity with ohmmeter. Is breaker open? I v 1 Push to reset breaker. Does generator AC output voltage build up? no I I t- -t-l 1 I P 4 I I If voltage is unstable, high or low, or causes breaker to trip, see Flow Charts B. C, D. or E I I t Flash exciter field per TEST [D]. Does generator output voltage build up? Is residual voltage across 1621-62and 63 5 to 10 VAC or more? Disconnect stator leads 7 and 8 from TB21-62 and 63. Is residual voltage across leads 5 to 10 VAC or more now? Check reactor L21 and transformer T21 per TESTS [B] and [E]. I Is exciter field voltage across VR21-5 & 6 5 VDC Check diodes and SCR's on bridge assembly CR21 per TEST [C]. Check lead continuity between VR21-12 & l7 on generator, I Check exciter field wiring for opens per TEST [MI. Replace bad wiring. Check exciter field winding per TEST [HI. Replace if bad. Check fuses F2 and F3 for continuity on VR21 regu- Check exciter field wiring for shorts per TEST [MI. Replace bad wiring. Check diodes CR1through CR6 on rotor per TEST [GI.Re- I Check exciter rotor winding per TEST [J]. Replace if bad. v Replace voltage regulator PC board per procedure IF]. Do not replace the printed circuit board until the trouble not on the PC board has been located and correctedto avoiddamagelo new PC board. ' 22 Redistribution or publication of this document, by any means, is strictly prohibited. I FLOW CHART B. UNSTABLE VOLTAGE, ENGINE SPEED STABLE 1800 RPM - START Are there any broken wires or loose connections on voltage regulator assembly? --Yes Repair as required. i < Check wiring harness from regulator assembly to end bell per TEST [MI. Check OK? Repair wiring or replace as required. yes J- ~~ ~~~ Does adjustment of Dampening Control R26 on VR21 --Yesper adjustment [PI result in stable voltage? . Is voltage stable within spec at no load to full load range of generator set? Do not replace the printed circuit board untll the trouble not on the PC board has been located and corrected to avold damage to new PC board. Replace voltage regulator PC board per procedure [F]. FLOW CHART C. OUTPUT VOLTAGE TOO HIGH OR LOW START _I - Set RPM per instructions in appropriate engine manual. no---, Is engine running at correct RPM? Does adjustment of Voltage Adjust control R21 on VR21 result in correct output I I I Does adjustment of control R18 on VR21 result in correct output voltage? Set control pervoltage Calibration Adjustment [PI. I t Do not replace the prlnted clrcult board until the trouble not on the PC board has been located and corrected to avold damage to new PC board. Set per Voltage Calibration Adjustment [PI. I Are reference transformer ( ~ 2 1tap ) connections correct and secure on TB22? See TEST IO]. 1 I I I w I Are generator output leads properly connected? See Figure 36, page 34. f Replace voltage regulator PC board VR21 per procedure [F]. ’ 23 I I Redistribution or publication of this document, by any means, is strictly prohibited. . FLOW CHART D. EXCITER FIELD BREAKER TRIPS START I t Does AC output voltage build up to 150% or more of rated voltage before breaker trips? i I Check for any loose or broken wires or connections on VR21 assembly. -yes- t I no 1 Check diodes CR1.2,3.4,5 and 6 in rotor assembly per TEST [GI.Replace if bad. I I i Check diodes and SCRs in bridge assembly CR21 per TEST [C]. I Check exciter stator winding per TEST [HI. Replace if bad. Check exciter rotor winding per TEST [J]. Replace if bad. I Check.generator stator leads for proper, connection. See Figure 36, page 34. I * Check generator rotor field winding per TEST [L]. Replace if bad. I I Check generator stator windings per TEST [K]. Replace if bad. I I I DO nOf tephCt? the pdnted CirCUlt board until the trouble not on the PC board has bcen located and corrected to avolddamage to new PC board. 24 I Replace voltage regulator PC board VR21 per procedure [F]. Redistribution or publication of this document, by any means, is strictly prohibited. I I FLOW CHART E. UNBALANCED GENERATOR OUTPUT VOLTAGE START Remove load at generator terminals. Is output Check for correct grounding of generator and load. still unbalanced? Yes I I . Are generator leads connected and grounded properly? See Figure 36, page 34. I I 1 I tno-l Correctas necessary. t I Is generatorstator winding continuous per TEST [K]? I I Replace stator assembly. Check load for ground faults and correct as necessary. 25 Redistribution or publication of this document, by any means, is strictly prohibited. ADJUSTMENTS AND TESTS (YD GENERATORS USING UR TYPE REGULATORS) GENERAL All of the following Adjustments and Tests can be performed without disassembly of the generator. They should be used for testing generator and regutator components in conjunction with the troubleshooting flow charts. TESTCNG AC RESIDUAL VOLTAGE . FIGURE 21. L21 REACTOR Generator residual AC voltage should be checked first if there is no AC power output. A quick place to check is at TBzl across terminals 62 and 63 (see Figure 20). Residual voltage should be 5-10 VAC. If none, flash field pet Test [D]. if residual voltage is present at TB21, then check circuit breaker CB21. If CB21 is OK, proceedto VR21 PC board and check for residual voltage between connector numbers 11& 12,1& 2, and 9 & 10. If none, check continuity between these points with the gen set shut down. If voltage is low, check L21 reactor (Test [B] and T21 transformer (Test [E]). ' AC TERMINALSARE GIVEN NUMERIC DESIGNATIONS FOR T f 3 T REFERENCE ONLY. DOES NOT APPEAR ON UNIT. v TESTING.L2f REACTOR The t21 eommutating reactor (Figure 21) mounts inside the control box CRI I The coils 1-2 and 3-4 are wound on the same core. Resistance between 1-2 and 3-4 should be .031 to ,037and .037to .046 ohms respectivelyat 77OF (25'). Resistance between coils and from any terminal to frame of the reactor should be infinity. rc1 C ) I FIGURE 2 2 RECTIFIER BRIDGE ASSEMBLY TESTING RECTIFIER BRIDGE ASSEMBLY (CR21) The rectifier bridge located within the control cabinet, contains 3 diodes, CR1, CR2 and CR3, and two silicon controlled rectifiers, SCRl and SCR2. The components are encapsulated within a hermetically sealed block, therefore failure of any diode'or SCR means the entire unit has to be replaced. See Figure 22. Disconnect wires from rectifier unit prior to testing. Test unit in order shown in Table 5. Refer to Figure 23 for SCR1 and SCR2 test circuit. When test is complete and satisfactory, reconnect unit observing correct wiring hook-up. 26 Redistribution or publication of this document, by any means, is strictly prohibited. L. DRY E L L BATTERY FIGURE 23. TESTING SCR TABLE 5. TESTING RECTIFIER BRIDGE ASSEMBLY CR21 TEST OHMUEERLEAD RECTlFIER - + 1 TERMINUS x TEmNG CR ISCR REMARKS METER SCUE Infmily RXlOK + u 1 3 series respectivelywith the 12amp300 Vdiode. Start the generator setand operate at normal rpm. Touch positive lead to + terminal on rectifier bridge, and negative lead to the terminal. Hold leads on terminals just long enough for voltage to build up. - X E x DO not keep excitation circuitry connected longerthan BseconL,ordamage may occur to the exciter regulator. . CAUTION 3 + x X SCRl RXlOK I"f#lir, IC1 x ~I I ~ vI Infmily 1 4 1 x 5 x 6 X - x x CRl RXlOK PLACE RESISTOR HERE FOR I 12V OR 24V BATTERY RXl ACI m + . lnfintly RXlOK DCVdPnckf DC VOmMn lmd R..dh9 less lhan SCRZ r 6 V Ds.tu* rrlh Ralrbr + + - 9' AC1 + SCRl ACl lo" AC2 + SCRZ AC? 1 + 3 VOID + 3 VOID RECTIFIER BRIOGE ASSEMBLY 6 VOLT DRY CELL BATERY FIGURE 24. FIELD FLASHING CIRCUIT - FLASHING THE FIELD If output voltage does not build up it may be necessary to restore residual magnetism by flashing the field. Assemble a &volt battery and diode as shown in Figure 24. TESTING REFERENCE TRANSFORMER T21 If a &volt lantern battery is not available, a 12-volt or 24-volt generator set battery can be used. However, a 20-ohm or a &ohm, 2 watt resistor must be used in Transformer T21 has eight leads; six are primary leads marked H1 through H6, two are secondary leads marked X1 and X2. 27 Redistribution or publication of this document, by any means, is strictly prohibited. ing rectifier bridge assembly, Figure 26. Using an accurate ohmmeter, test each CR using negative and positive polarities. Test rectifiers as follows: 1. Disconnect all leads from assembly to be tested. 2. Connect one test lead to F1+ stud and connect other lead to CRl, CR2, and CR3 in turn; record resistance value of each rectifier. 3. Connect one lead to F2- stud and connect other lead to CR3, CR4 and CR5 in turn; record resistance value of each rectifier. 4. Reverse ohmmeter leads from step 2 and record resistance value of each rectifier F1+ to CRl,, CR2, and CR3 and F2- to CR4, CR5, and CR6. 5. All three resistance readings should be high in one tedand low in the other test. If any reading is high or low in both tests, rectifier assembly is . . defe,ctive. 6. Replace defective rectifier assembly with new, identical part. The winding schematic (Figure 25) shows the resistance values for the individual coils in ohms. Resistance between any primary and secondary leads and from any lead to transformer frameshould be infinity. m 531-649 OHMS x1 Tzl c Use 24ibr-h. (2.7 Nom)torquewhen replacingnutsof Fl+andF2-, CRl, CR2, CR3, CR4, CRS, and CR6. x2 vR21-10 vR21-9 CR3 FIGURE 25. T21 WINDING SCHEMATIC . . VR21 REPLACEMENT Usethefollowing procedurefor replacing the voltage regulator PC board or VI? chassis. 1. Stop engine. 2. Disconnect and if necessary, label wires: VR21-1 through VR21-12 Refer to AC control wiring diagram. 3. Remove four screws at corners. 4. Remove old PC board. 5. Install new PC board; secure with four screws. 6. Reconnect wires removed in step 2 at proper terminals. 7. Place jumper W12 at proper terminals for your particular voltage code and voltage connection. See Test Procedure [Q]. 8. Perform voltage calibration and stability adjustment procedures to obtain the correct generator output voltageand stability with new PC board in FIGURE 26. TESTING ROTATING RECTIFIERS [HI TESTING EXCITER STATOR Test the exciter stator (Figure 27) for open or shorted windings and grounds as follows: Testing for Open or Shorted Windings: Disconnect F1+ and F2- exciter field leads from terminal block in generator end bell. The resistance between field leads should be 13.05 to 15.95 ohms at 77’ F (25OC). set. TESTING ROTATING RECTIFIERS Testing for Grounds: Connect ohmmeter between either field lead and exciter stator laminations. Use ohmmeter set at RX 100 scale. An ohmmeter reading of less than infinity ( Di ) indicates defective ground insulation. ’ Two different rectifier assemblies make up the rotat- 28 Redistribution or publication of this document, by any means, is strictly prohibited. 1 - TESTING GENERATOR STATOR Using proper test equipment, check the stator for grounds, opens, and shorts in the windings. Testing for Grounds: Some generatots have ground connections to the frame. Check wiring diagram. OHMMETER RESISTANCE BETWEEN F l AND F2 SHOULD BE 13.05 TO 15.95 OHMS AT 77'F (25°C) Using an ohmmeter set at RX 100, test each stator winding for shorts to laminations. A reading lessthan one megohm indicates a ground. FIGURE 27. TESTING EXCITER FIELD Testing for Open or Shorted Windings: Test for continuity between coil leads shown in Figure 29; all pairs should have equal resistance. Use an accurate instrument for this test such as a Kelvin Bridge. Resistance valuesat 77' F (25OC) are given in Table 6. IJI TESTING EXCITER ROTOR If any windings are shorted, open or grounded, replace the stator assembly. Before replacing the assembly, check the leads for broken wires or insulation. Test the exciter rotor (Figure 28) for open or shorted windings or grounds as follows: Testing for Open or Shorted Windings: Use a Wheatstone Bridge for this test. Disconnect main rotor field leads which connect to rotatingrectifier assemblies at F1+ and F2-.Disconnect lead wires from diodes CR1, CR2, CRq, CR4, CR5and CR6.Test between exciter lead pairs Tl-T2, T2-T3 and Tl-T3. Resistanceshould be 0.6 to 0.7 ohms at 68"F (2OOC). THREE PHASE MODELS TEST BETWEEN WIRE PAIRS Testing for Grounds: Connect leads of ohmmeter between each CR lead and exciter rotor laminations; use RX 100 scale on ohmmeter. An ohmmeter reading less than infinity (.) indicates defective ground insulation. FI 75 3c DTAIMDTA 25.0 kW -066to .081 .031 to -038 SK 30.0 kW PTO 30.0 kW CRS FIGURE 28. TESTING EXCITER ROTOR 29 VOLTAGE CODE kW RATING 60 Hertz Ohms Ohms .a99 to -121 -027 to -033 Ohms Ohms Code 50 Tl-T2, T2-T3, T3-Tl .149to .183 Ohms -032to .039 Ohms Redistribution or publication of this document, by any means, is strictly prohibited. CONTACT ONE PROD TO EACE OF M E FIELD LEADS AND OTHER PROD TO ROTOR SHAFT. IF ROTOR IS GOOD. THERE W I L L BE NO 8215 READING ON OHMMETER. CONTACT ONE PRODTO EACH FIELD LEAD 8213 FIGURE 30. TESTING ROTOR FOR GROUNDS FIGURE 31. TESTING ROTOR FOR AN OPEN CIRCUIT TESTING GENERATOR ROTOR WIRING HARNESS CHECK For these tests, use an ohmmeter on RX 100 scale. Testing for Grounds: On brushless. type generators, check for grounds between each rotor lead and the rotor shaft, Figure 30. Perform tests as follows: 1. Remove rotor leads F1+ and F2- from rotating rectifier assemblies. 2. Connect ohmmeter leads between F1+ and rotor shaft and between F2- and rotor shaft. Meter should not register. 3. If meter registers, rotor is grounded. 4. Replace grounded rotor with new, identical part. Carefully check wiring harnesses as follows: 1. Inspect all wires for breaks, loose connections, and reversed connections. Refer to applicable wiring diagram. 2. Remove wires from terminals at each end and using an ohmmeter, check each wire end to end for continuity or opens. 3. Using an ohmmeter, check each wire against each of the other wires for possible shorts or insulation breaks under areas covered by wrapping material. 4. Reconnect or replace wires according to applicable wiring diagram. Testing for Open or Shorted Winding: Perform tests as follows: 1. Remove rotor leads F1+ and F2- from rotating rectifier assemblies. SENSITIVITY REFERENCE CIRCUIT Three types of frequency sensitivity reference voltage are possible with voltage regulator VR21. 1. frequency sensitive-voltage output reduces in direct proportion to the engine speed. 2. Non-frequency sensitive-voltage output does not decrease when engine speed decreases. A temporary overload with a non-frequency sensitive reference could cause the engine to reduce speed, and then require a 50- to 60-percent load reduction before it could return to rated speed. 2. Using ohmmeter, check resistance between F1 and F2 leads, Figure 31. Theresistancevaluesat68°F (2OOC)should beas follows: 1.84to 2.24ohmsfor25DTNMDTAand 30kW PTO models. 1.62 to 1.98 ohms for 30 kW SK models. If resistance is low, there are shorted turns. If resistance Is high, rotor winding is open. In either case, rotor must be replaced. 3. Semi-frequency sensitive - voltage output decreases as engine speed decreases, but not as 3. Replace defective rotor with new, identical part. 30 Redistribution or publication of this document, by any means, is strictly prohibited. . .# .) 3. Using a screwdriver, turn R18 potentiometer on printed circuit board VR21 counterclockwise to decrease the voltage or clockwise to increasethe voltage. Observe voltmeter on meter panel while making adjustment. Set voltage with no load connected to generator. (ExarnplcFor a 120/240 volt connection, set at no-load voltage or approximately 246 volts.) severely as in the "frequency sensitive" mode. Unless otherwise requested by the purchaser, Onan sets are connected at the factory for semifrequency sensitivevoltage regulation becausea decrease in voltage output reduces the effective load on the engine, permittingthe set to return to its rated voltageand frequency when the overload is removed. If voltage is unstable or tends to hunt, turn R26 potentiometer on VR21 in the direction shown on printed circuit board to increase voltage sensitivity. CHANGING SENSITIVITY REFERENCE The sensitivity reference can be changed if necessary, by unsoldering W 1 on VR21 at "S' (semifrequency sensitive) and resoldering itto ho1e"F" (for frequency sensitive) or to hole "N" (for nonfrequency sensitive) voltage regulation. See Figure 32. -w2 NOTE SEE VOLTAGE CHART FIGURE36 0 P L . I CONNECT LOOSE WIRE FROM TERMINAL #63 1 TO EITHER H3,H4, H5 OR H6 DEPENDING ON VOLTAGE SELECTED. 30kW PTO AND SK SETS I CONNECT LOOSEWIRE FROM TB2-2 TO TB2- 1 HI,HZ H3,H4. H5 OR H6 DEPENDING ON VOLTAGE SELECTED. I 1 FIGURE 32 REGULATOR CIRCUIT BOARD VOLTAGE ADJUSTMENT After replacement of the regulator printed circuit board (VR21), voltage adjustment is performed as follows (see Figure 32): 1. Center the voltage adjust knob so pointer is in a vertical position. 2. Start unit and operate at correct rpm. I m2 25 kW DTA SETS FIGURE 33. CONNECTING LOOSE WIRE W12 31 Redistribution or publication of this document, by any means, is strictly prohibited. VOLTAGE REGULATOR [a1 The voltage regulator assembly (Figure 34) controls the generator AC output. Basic components of the regulator are: RECONNECTIONWIRE W12 Figure 36 shows reconnection possibilities for the generator. When reconnecting for a differentvoltage, be sure to also reconnect lead W12 (inside control box) to the proper H terminal as shown in Figure 33. Printed circuit board VR21 Voltage reference transformer T21 Commutating reactor L21 SCR bridge rectifier CR21 On the SK series generator sets, T21, CR21 and L21 are mounted to the control box inside panels close to the VR21 printed circuit board. Thevoltage regulator printedcircuit board and schematic diagram are shown in Figure 35. VR MOUNTINGPANU \ PC BOARD VR21 TERMINAL BLOCK TB2 VOLTAGE TRANSFORMER T21 SCR BRIDGE CR21 COMMUTATING REACTOR L21 RESISTOR ASSEMBLY FIGURE 34. VOLTAGE REGULATOR ASSEMBLY 305-0579 32 Redistribution or publication of this document, by any means, is strictly prohibited. . PART DESCRIPTION REF. NO. 4 C1.14 c2. c 7 c3 c4.c12 c5. c8 G6 c11 C13 CR3 Thnr 11 CR12 CR13 CR14 F2. F3 1c1 Q2 Q3 Rl R2. R3 R4 A5 R6 R7 R8. R16 R10 R11 R9 R12 R13 R14 R15, R27 R17 R18 R20.22 29 & 30 R21 R24 PART REF. NO. - Board Assembly, Printed Complete Capacitor A7 Mfd, 250 Volt Capacitor -22 Mfd. 250 Volt Capacitor -A7 Mfd. 400 Volt Capacitor -.47 Mfd, 250 Volt Capacitor 1 Mfd. 100 Volt Capacitor .33Mfd, 250 Volt Capacitor 1 Mfd. 400 Volt Capacitor Electrolytic 100 Mfd. 10 Volt DESCRIPTION - K1 Resistor 2 Watt. 10,000-Ohm Potentiometer 112 Watt, 1W.000-0hm Resistor 1f2 Vdatt -47 Meg-Ohm Terminal Block Diode Zener 24 Volt Clip Fuse Relay, Magnetic R e e d R19 Resistor 2 Watt, 6.8009hm - R25, R31 - TBl CR15 R26 R28 - - - - - - - Rectifier Silicon Diode Zener 5.6 Volt Diode Zener 20 Volt Diode -Zener 18 Volt Fuse 114 Amp Integrated Circuit Transistor Silicon NPN Transistor Unijunction Resistor 112 Watt, 47-0hm Resistor 112 Watt, 33-0hm Resistor 2 Watt, 4.7 Meg-Ohm Resistor Fixed 10 Watt, 27Whm Resistor Fixed 15 Watt, 5.000-0hm Resistor 112 Watt, 3.000-0hm Resistor 112 Watt, 330.000-0hm Resistor 112 Watt, 51.100-0hm - - -- - Resistor Fixed3 Watt, 15,000-0hm Resistor 112 Watt, 90,900-0hm Resistor 112 Watt, 10.000-0hm Resistor- 112Watt. 220,000-0hm Resistor- 1RWatt. 100.000-Ohm Resistor, Metal Film 114 Watt, 11.000-0hm Potentiometer-5,0hm. 112Watt - - 1 Resistor 114 Watt, 28.000-0hm Resistor Metal Film 114 Watt, 5.1 1W h m Resistor Metal Film 114 Watt, 8,870-0hm - - PC BOARD ASSEMBLY -- --- - //.%a SCHEMATIC ES-1068 FIGURE 35. UR VOLTAGE REGULATOR PC BOARD 332-1956 33 Redistribution or publication of this document, by any means, is strictly prohibited. 1201240 VOLT, 1 PHASE, 60HERTZ NAMEPLATE VOLTAGE CODE 3 1- 3471600 VOLT, 3 PHASE, 60 HERTZ 1201240 VOLT, DELTA 3 PHASE,60 HERTZ NAMEPLATE VOLTAGE CODE 9X NAMEPLATE VOLTAGE CODE 5D l------ L1 P TI I LO TO L2 Lo L2 I c 1 L3 CONNECT LEAD W12 TO H5TERMlNAL I I TO 12 LEAD GENERATORS ONLY GENLRATOR CONNECTION W I R I N G DIAGRAM (WITH CURRENT TRANSFORMERS WHEN USED) LO 11 12 11 12 16111 18112 14 110 LO LO 15 17 13 16 17 12 111 14 18 110 13 12 11 LO 11 19 13 112 15 19 11 12 13 11 12 13 12 18 7 5 13 19 1 1101li 112 11 17 14 FIGURE 36. GENERATOR WRING AND RECONNECTIONDIAGRAMS (25DTAM#DTA, 30 kW -0 AND SK SERIES) I 34 Redistribution or publication of this document, by any means, is strictly prohibited. . GENERATOR REPAIR, J-SERIES stator assembly, Figure 38. Screwdriver slots in adapter provide a means for prying stator loose. Be careful not to let statortouch or drag on rotor. 6. Remove air baffle from adapter. Turn rotorthrough-stud nut to end of stud. While pulling rotor outward with one hand, strike nut a sharp blow. Support rotor with hoist and sling to avoid bending rotor-through-stud, Figure 39. Use a heavy, soft faced hammer to loosen the rotor from its tapered shaft fit. If rotor does not come loose, strike it asharp downward blow in center of lamination stack. Rotate rotor and repeat until it comes loose. Be careful not to hit bearing or windings. 7. After disassembly, all .parts should be wiped clean and visually inspected. r’ COOLINGAIR SUPPORT ROTOR WITH HOIST AND SLING TO AVOID BENDING THROUGH STUD FIGURE 37. GENERATOR AIR OUTLET DISASSEMBLY INSERT PRY BEHIND BLOWER WHEEL THROUGH AIR OUTLET OPENING 1. Disconnect battery to preventaccidentalstarting of engine. 2. Remove end bell cover to reveal rotor-throughstud nut. 3. Remove B1 lead from tapped adjustable resistor in generator air outlet opening, Figure 37. 4. Remove leads from control box to ignition system, choke, start disconnect switch, etc., on engine. 5. Remove stator-through-stud nuts, end bell, and TURNNUTOUTTO END OF GENERATOR THROUGHBTUD STRIKE WITH SOFT HAWER WHILE PRYING. =. ~ , d FIGURE 39. ROTOR REMOVAL BRUSHLESS EXCITER ADAPTER STATOR I FIGURE 38. GENERATOR DISASSEMBLY 35 Redistribution or publication of this document, by any means, is strictly prohibited. ASSEMBLY 9. Torque down rotor-through-stud nut 55-60 ft. Ib (75-81 Nom). The rotor and stator are automatically aligned because stator and bearing support were tightened in step 8. 10. Tap end bell to align at horizontal and vertical plane; use a lead hammer to relieve stresses on components (recheck torque). 11. Reconnect leads to preheater, centrifugal switch and governor solenoid. 12. Install lead B1 on adjustable resistor, R21. 1. Clean and inspect all mating surfaces. 2. Coat mating area between generator bearing and end bell bearing hole with a thin film of Molykote or equal. 3. Install rotor-through-stud in engine crankshaft. 4. Install key in the crankshaft. 5. Slide rotor over through-stud and onto crankshaft. Be careful not to let weight of rotor rest on or bend the through-stud. 6. Install baffle ring. 7. tnstall stator through-studs in adapter. 8. Install stator and end bell. Torque nuts on through-studs to 19 to 21 ft-lbs (26 to 28 Nom). Check B1 lead to see that it is short and is kept away lrom the blower. If nearrery when Installing a new stator or leads, cut B1lead shorler . . and reinstail the connector. 13. Install end bell cover. MakeartalntheBl kadlsplsccdthroughthegrommetinthe bffk ring and out the air dirchargf! openlng in the adrptcr. . 36 Redistribution or publication of this document, by any means, is strictly prohibited. PTO ALTERNATORS ALTERNATOR DESCRIPTION mounted gear box and splined driveshaft and control box,which includes voltmeter and a full output load Plug- The 15 kW through 30 kW alternators are four-pole, revolvingfield, brushlessexciter, 1800rpmmodelsof drip-proof construction. Alternator design includes both single and three-phase, 60 hertz type alternators. The alternator rotor is fastened to the gear case by the rotor through-stud which passes through the rotor shaft, Figure 40. Control Box The control box includes the voltage regulator, voltmeter, 15 amp duplex receptacle with circuit breaker, 50 amp welder receptacle with circuit breakers, a full output load connector with load circuit breakers, and a field circuit breaker. The load circuit breakers can be used as an onoff switch. Alternator power must feed into the farm electrical system through an approved double throw load transfer switch. The end bell and stator housing are attached by four through-studs which pass through the stator assembly to the gear case alternator adapter. The brushless exciter stator mounts in the end bell while the exciter rotor and its rotating rectifier assemblies mount on the alternator rotor shaft. The shaft is supported at both ends by lubricated ball bearings. A centrifugal blower on the drive end of the alternator draws air through the alternator for cooling. Gear Box The gear box and alternator adapter contain two helical gears supported by heavy duty ball bearings. The bearings and gears are lubricatedby the gear box oil. The gear box requires 1.0-pint (-47 litre) of SAE 90 EP (extreme pressure) gear lubricant. The complete alternator includes a built-in exciter and voltage regulator, mounting feet, lifting eye, ORIGINAL EQUIPMENT MANUFACTURERS PRODUCTS Onan manufactures several versions of YD PTO alternators which are sold nationally under other brand names. The major difference in these units are location of control components and the form of mounting hardware. 37 Redistribution or publication of this document, by any means, is strictly prohibited. SPECIFICATIONS b' SINGLE PHASE ALTERNATORS . 15.OYD-3G ...................... Running. Watts.. .................... Volts ............................... Starting Watts 37.500 . 15,000 1201240 1 ............................ .............................. ................. ....................... ............................... .......................... ......... Phase.. Hertz Current (Amperes). Power Factor Wire Brushless Alternator Speed (Nominal) Tractor Speed (Nominal) Minimum Horsepower Required Driving Source Gear Box Oil Capacity, Pints Gear Lubricant Weight 20.OYD-3G 25.OYD-3G 30.0Y D-3G 52,000 20,000 1201240 62,500 25,000 120/240 80,000 30,000 1 1 60 60 1.o ............ ................. ........ ..................... ............................. 60 83.3. 62.5 104.2 1.o 4 Yes 1800 1.0 4 Yes 1800 540 540 540 30 1.0 Pt (0.47 litre) SAE 90 EP 354 Ibs. (161 kg) 35 1.O Pt (0.47 litre) SA€ 90 EP 398 Ibs. (181 kg) 45 1.0 Pt (0.47 litre) SA€ 90 EP 438 Ibs. (198 kg) 4 Yes 1800 1201240 1 60 125 1.o 4 Yes 1800 . 540 . 55 1.0 Pt (0.47 litre) SAE 90 EP 483 Ibs. (219 kg) THREE PHASE ALTERNATORS* .............................. .............................. ..................................... ...................................... ...................................... ......................... .............................. ....................................... .................................. ................. Starting Watts Running Watts Volts.. Phase Hertz Current (Amperes). Power Factor. Wire Brushless Alternator Speed (Nominal) Tractor Speed (Nominal) Minimum Horsepower . . Required, Driving Source . Gear Box Oil Capacity, Pints Recommended Gear Lubricant Weight .................... ................................. ................ .............. ..................................... 20.0Y D-5DG 25.OYD-5DG 30.OYD-5DG 57,500 20,000 1201240 70,000 25,000 120/240 30,000 3 60 60.2 0.8 4 Yes 1800 540 35 1.0 Pt (0.47 litre) SAE 90 EP 423 Ibs. (192 kg) 95,000 60 75.4 0.8 4 Yes 1800 540 120/240 .3 60 90.5 0.8 4 Yes 1800 540 45 1.0 Pt (0.47 litre) SAE 90 EP 438 Ibs. (198 kg) 55 1.0 Pt (0.47 litre) SAE 90 EP 512 Ibs. (232 kg) 3 . All models are CSA Certified. 'Delta wound, one phase center-tapped to deliver 120/240 volt, single-phase power in capacities to 2J3 of rated %phase kVA. 38 Redistribution or publication of this document, by any means, is strictly prohibited. FIELD EREAKEP \ VOLTMETER RECEPTACLE BREAKER / 120 VOLT, I5 AMP 240 VOLT. 50 AMP CONTROL BOX CIRCUIT BREAKER LIFTING EYE PTO SHAFT ALTERNATOR ALTERNATOR STATOR EXCITER STATOR EXCITER ROTOR DRIVE ROTOR-THROUGH-STUD TORQUE TO 55-60 FT. LES MOUNTING FOOT FIGURE 40. YD TRACTOR DRIVE ALTERNATOR Redistribution or publication of this document, by any means, is strictly prohibited. WIRING CONNECTIONS, 15-25 kW SINGLE PHASE ALTERNATORS THREE PHASE ALTERNATORS The most popular single phase connection is the 120/240combination. With this connection either 120 or 240 volts can be used alone or at the same time (Figure 41). Three phase alternators are connected as shown in Figure 42. The three load wires are connected to T1, T2 and T3. Single phase (240 volts) can be obtained between any two three-phase terminals. Single phase (120volts) can be obtained between T1 and TO or T2 and TO. TO is the grounded terminal for 120 volts. Referto page 8 f o r wiring connections of 30 kW units using the UR control. . VOLTAGE REGULATOR VOLTAGE REGULATOR &: ' F ; G i ? F -'- 1 ,e3 to. EXCITER WINDING GI( VOLTMETER LINE CIRCUIT BREA KE R I c85 I ALTERNATOR ) ALTERNATOR OUTPUT LEADS ?I CBi FIELD BREA.KER EXCITER WINDING FIELD BREAKER T4 CB2 POWER CABLE RECEPTACLE POWER CAB LE RECEPTACLE 240 v. RECEPTACLE w 1-,q RECEPTACLE 240 V. RECEPTACLE I20 v. & r RECEPTACLE GROUND FIGURE 41.120/240 VOLT, SINGLE PHASE CONNECTION FIGURE 4 2 THREE PHASE 240 VOLT DELTA CONNECTIONS . 40 Redistribution or publication of this document, by any means, is strictly prohibited. NOTE: For detailed troubleshooting information refer to GENERATOR and CONTROL TROUBLESHOOTING procedures and tests. A few simple checks and a proper troubleshooting procedure can locate the probable source of trouble and cut down troubleshooting time. 1. Check all modifications, repairs, and replacements performed since last satisfactory operation of set to be sure that connection of generator leads are correct. A loose wireconnection, overlooked when installing a replacement part could cause problems. An incorrect connection, an opened circuit breaker, ora looseprinted circuit board are all potential malfunction areas to be eliminated by a visual check. 2. Unless absolutely sure that panelinstrumentsare accurate, use portable test meters for troubleshooting. 3. Visually inspect components on voltage regulator. Look for dirt, dust, moistureand cracks in the printed solder conductors. Burned resistors, arcing tracks are all identifiable. Do not mark on printed circuit boards with a pencil. Graphite lines are conductive and can cause short circuits between components. TABLE 7. TROUBLESHOOTING NATURE OF TROUBLE Alternator Overheats Noisy Alternator Low Voltage Output of Alternator u . No Voltage Output, or Voltage Builds Up But Is High, Low, Unstable, Trips Field Breaker. POSSIBLE CAUSE REMEDY 1. Disassemble alternator and clean. 2. Clean alternator air intake and outlet areas. 3. Remove part of load. 1. Tighten mounting bolts. 2. Replace. Check alignment. 1. Test alternator with line wires disconnected. 2. Readjust PTO speed to 540 to 600 rpm. 1. Windings and parts covered with dirt and oil. 2. Air intake is restricted or incoming air too hot. 3. Overloaded. 1. Alternator loose on base. 2. Defective bearing. 1. External short circuit on line. 2. Incorrect PTO speed. Refer to GENERATOR TROUBLESHOOTING, Page 5. . . 41 Refer to GENERATOR TROUBLESHOOTING, Page 5. . Redistribution or publication of this document, by any means, is strictly prohibited. SERVICE AND MAINTENANCE PERIODIC SERVICE AND INSPECTION BEARINGS Followa regularscheduleof inspection and servicing. Make a good visual check before, while, and after alternator is operating; look for loose or broken leads and bad connections. The ball-type bearing on the cover end is double sealed and lubricatedfor life. If this bearing becomes noisy, worn, or otherwise defective, replace it. Remove the old bearing with a gear puller and drive or press new ones into place. The bearing on the gear box end is lubricated by the gear box lubricant (SAE 90 EP). For disassembly and repair see Alternator Repair section on page 47- GEAR BOX LUBRICATION Use only SAE 90 EP multi-purpose gear lubricant. Drain the gear box after the first 100 hours of operation and refill with fresh lubricant of, the recommended grade. Repeat this procedure each year thereafter, or every 250 hours of operation, whichever occurs first. Maintain the proper oil level between changes. Ezx CAUTION Overfilling will causefoaming,which can lead to an oil kak. Remove oil fill plug at top of thecaseand oil level plug from the face of the gear case, Figure 43. Fill case until oil flows from the oil level plug hole. Gear box holds 1 pint (0.47 litre) U.S. measure. Replace both plugs. PTO SHAFT LUBRICATION Grease the universaljoints and telescoping shafts on the PTO shaft at least every25 operating hours. Under adverse conditions, grease the joints as required, possibly every 4 to 8 hours. (PTO GUARD REMOVED) = Never operate the alternator with the protective guardsremoved from the PTOshaft Perm a l injury or death may othemise result. WARNING FIGURE 43. GEAR BOX LUBRICATION '42 Redistribution or publication of this document, by any means, is strictly prohibited. ' * TWO BEARING ALTERNATORS GENERAL end bell while the exciter rotor and its rotating rectifier assemblies mount on the rotor shaft. Onan YDtwo bearing alternators 5.0 through 20.0 kW are 50 and 60 hertz units designed for belt and pulley or direct coupling to a separate prime mover. . VOLTAGE REGULATOR The line voltage regulator is an all solid state device. Acentrifugal bloweron the frontend of the rotorshaft circulatesthe alternator cooling air. The air is drawn in through the end bell cover, over the rotor, and discharged through an outlet at the blower end, Figure 4.4. Basic components of the voltage regulator are: Printed circuit board Voltage reference transformer T21 0 Commutating reactor CMR21 Field circuit breaker Voltage adjust rheostat (optional) A ball bearing at each end supports the rotor shaft. The end bell and stator housing are attached by fourthrough-studs which pass through the stator assembly. The brushless exciter stator mounts in the Figure 45 shows the above components in a typical control on standard units. /FIELD BREAKER STATOR, m\ I 1- CONTROL JUNCTION BOX --- ASSEMBLIES ROTO R-SHAFT TORQUE TO 130 TO 150 FT. LBS STATOR-THROUGH-STUD m u 1 1 a ’ ROTORI . 1 END BELL . \ TORQUE TO 19-21 FT. LBS ( S 2 8 Wm) I flGURE 44. GENERATOR (CUTAWAY VIEW) 43 Redistribution or publication of this document, by any means, is strictly prohibited. c REGULATOR MOUNTING PANEL FIELD CIRCUIT BREAKER I I I t II 1I I I CYRZI-2 CURZI-3 I I CURZI-4 7821-1 7821-2 VR2l-9 VRZ 1-1 0 TBZI -F 1 VR21-8 VR21-1 COY. The control box (on top of the alternator) contains the voltage regulator and the lowerportionof the junction box for making alternator to load line connections. I I CBZI-2 VRPI-V4 CONTROL BOX I I The generator output leads are accessible by removing the control box cover, 14 yR2 1-7 I I I -I I -I I -I I VPl-VI 1 15 I yR21-2 1 15 1 AC VOLTMETER . FIGURE 45. VOLTAGE REGULATOR ASSEMBLY OPTIONAL SWITCHBOARDS Switchboards (Figure 46) are optional equipment which can be purchased at added cost. They contain a voltmeter; ammeters, line circuit breakers and marked terminals. The switchboard is used to check alternator voltage, load current and.voltage regulation with a varying load. When ordering parts for switchboards, obtain part numbers and description of part from the wiring diagram supplied with the switchboard. I .. SINGLE POLE LINE CIRCUIT BREAKERS KNOCK OUTS FIGURE 46. TYPICALWALL MOUNTING "SB" SWITCH-; BOARD 3 PHASE, 120120aVOLTS - 44 Redistribution or publication of this document, by any means, is strictly prohibited. SPECIFICATIONS TWO BEARING ALTERNATORS MODEL NO. AND KW RATING 6.0-3CSl 7.5-3cs/ GENERAL UTILITY RATING ELECTRICAL DETAILS kVA Frequency In Hertz Phase Wires Watts 60 1 1 4 4 6000 60 7500 at PF 6.0 @ 1.0 7.5 @ 1.0 Amps 240V 25.0 31-3 Weigh€ (Approx.) Lbs. kg 235 106.6 259 117.5 NO= All units are two-bearing alternatorsdesignedfor clockwise mtation with belt andpulley drive or direct drive coupled to a separateprime mover- Thedirection of rotation is clockwiseonly; it is determined when facing the drive shaft end. The60 hertz units operate at 1800 rpm while the 50 hertz units operate at 1500 rpm. NOTE: The3CSland 53CSlmodelsare 1201240 voltsinglephaseunits. The lSSland518Slmodels are threephasebroadrange reconnectible units. See Figure 19,page 20, for voltage codes, wiring diagram, and connection diagrams. ' 45 Redistribution or publication of this document, by any means, is strictly prohibited. NOTE: For detailed troubleshooting information refer to GENERATOR and CONTROL TROUBLESHOOTING procedures and tests. A few simple checks and a proper troubleshooting procedure can locate the probable source of trouble and cut down troubleshooting time. 1. Check all modifications, repairs, replacements performed since last satisfactory operation of set to be sure that connection of generator leads are correct. A loose wire connection, overlooked when installing a replacement part could cause problems. An incorrect connection, an opened circuit breaker, or a loose printed circuit board are all potential malfunction areas to be eliminated by a visual check. 2. Unless absolutely sure that panel instrumentsare accurate, use portable test meters for troubleshooting. 3. Visually inspect components on voltage regulator. Look for dirt, dust, or moisture and cracks in the printed solder conductors. Burned resistors, arcing tracks are all identifiable. Do not mark on printed circuit boards with a pencil. Graphite lines are conductive and can cause short circuits between components. c TABLE 7. TROUBLESffOOTING: Low Voltage Output of Alternator . I 1. Speed IGWbecause of loose, slipping belts. 2. External short circuit on line. 3. Open circuit of shunt field winding. 4. Short circuit of winding in the field or armature. 46 1. Adjust belt tension. 2. Test alternator with line wires disconnected. 3. Make proper connections. 4. Refer to GENERATOR TROUBLESHOOTING, Page 5. Redistribution or publication of this document, by any means, is strictly prohibited. . ALTERNATOR REPAIR GENERAL . 2. Remove gear case drain plug and allow oil to drain, Figure 48. Disassembly and reassembly of .the PTO and two bearing akernators are nearly identical. The difference involves the drive end and the controls. Use the appropriate Parts Catalog and Wiring Diagrams as aids in reassembling the control box hardwareandthe alternatoroutputand control leads. Use a new gasket when replacing gear case cover. -- The following items require disconnecting and removal before disassembly of gear case and alternator: 0 Disconnect engine PTO shaft. Remove control box cover. Disconnect alternator output leads from control components. Disconnect exciter leads F1 and F2 at printed circuit board. Remove control box from alternator. GEAR CASE DISASSEMBLY The gear case cover is drained of oil and removed from the unit for two purposes: (a) gear, bearing, or shaft replacement; and (b) to provide a flat end for supporting the alternator during disassembly and reassembly. 1. Remove PTO guard by loosening three 5/16 x 1/2-inch locking screws, Figure 47. FIGURE 48. DRAINING GEAR CASE RETAININGRING .. IR OUTLET GRILL . PTO SHAFT TUMBLING ROD PLATE GUARD . . FIGURE 47. GEAR CASE ASSEMBLY 47 f Redistribution or publication of this document, by any means, is strictly prohibited. 3. Removesix5/16x l-inch capscrewsandWo5/16 - l-l&inch 5. Block up gear case plate as shown in Figure 51 and tap PTO shaft out of plate. cap screws and gear case plate, Fig- ure 49. To assure a good seal always we a new gear case gasket when gear case plate Is assembled. FIGURE 49. GEAR CASE PIATE REMOVED FIGURE 51. REMOVAL OF PTO SHAFT FROM GEAR CASE PLATE 4. If necessary, remove seal and snap ring from around input shaft, Figure 50. Oldsealmutt bereplacedwith a new sealwhen reassembled 6. Remove snap ring and tap bearing through gear box plate, Figure 52 A FIGURE 50. INPUT SHAFT SEAL AND SNAP RING REMOVAL FIGURE 5 2 GEAR PLATEBEARING REMOVAL 48 Redistribution or publication of this document, by any means, is strictly prohibited. Alternator components are heavy, so use a hoist and rope sling and stator tongs for handling and separating the components, Figure 54. The drive gear and innerend bearing are pressed on the Input shaft and held In place by a key and a retaining ring, Flgure 53. Use a suitable press when it is necessary to replace the bearing, gear or shaft. On two bearlng alternators, remove drlve end bearlng plate and shaft key before upending the unit for dlsassembty. Usea hoist and ropesling to raise theend bell end up to a vertical position. 2. Support unit on drive end and use special blocks to protect drive shaft. This step isn't necessaryon PTO units if the gear case cover and shaft are removed first. 3. Remove four nuts from rotor-through-studs, Figure 55. 1. n FIGURE 53. INSTALLING SNAP RING BEHIND DRIVE GEAR BEARING ALTERNATOR DISASSEMBLY The alternator disassembly and reassembly is safer and easier with thealternator in the vertical position as shown in following sequence of illustrations. FIGURE 55. END BELL REMOVAL BRUSHLESS EXCITER BLOWER , / STATOR THROUGH-STUD KEY f A ' R E A FLE STATOR I ROTOR ROTOR THROUGH-STUD . COVER FIGURE 54. ALTERNATOR DISASSEMBLY 49 Redistribution or publication of this document, by any means, is strictly prohibited. ' 4. Remove end bell by tapping upward around joint and separating itfrom stator assembly, Figure 56. . FIGURE 56. FREEING END BELL FROM STATOR 5. Remove four stator through-studs with vise grip . pliers as shown in Figure 57. Reinstall two studs . during reassembly for aligning and guiding the ' . stator over the rotor. FIGURE 58. STATOR HANDLINGTONGS A pair of tongs is the most suitable device'for handling stators, Figure 58. The tongs shown were made from one inch steel bar. stock. The tongs should be a suitable size for handling several different size stators. FIGURE 57. STATOR THROUGH-STUD BOLT REMOVAL 50 Redistribution or publication of this document, by any means, is strictly prohibited. 6. Using a safe lifting device, stator handling tongs, or chain and lift hooks, lift stator assembly from gear case adapter. If necessary, lift unit off bench about one inch and tap adapter housing with a soft faced hammer to free stator from adapter, Figure 59. DO not set stator down on open end, top or bottom, because stator weight can damage . the windings. 8. Remove air baffle by loosening four locking screws, Figure 61. FIGURE 59. STATOR REMOVAL 7. While stator is stiil on lift tongs or hooks, revolve statorto horizontal position and set it down on its side, Figure 60. FIGURE 61. AIR BAFFLE REMOVAL FIGURE 60. REVOLVINGSTATOR FOR REPAIRS c 51 Redistribution or publication of this document, by any means, is strictly prohibited. A FIGURE 63. ROTOR AND FAN REMOVAL Use care to preventdamage to thefanblades. Broken blades will throw the fan out of balance and reduce the air flow rate. 11. Hold rotor in a suitable clamp and loosen nut on rotor-through-stud bolt as shown in Figure 64. FIGURE 62 ROTOR HANDLING SLING A rope sling is the most suitable device for handling rotors, Figure 62. 9. Remove rotor and fan .by using a soft-faced hammer to tap on the adapter while holding the rotor assembly about one inch above bench with a hoist and rope sling, Figure 63. Iz3 Uie care to prevent damage to the fan blades. Broken bladeswillthrow the fan out of balanceand reduce the air flow rate. CAUT~ON 10. If it is necessary to replace a damaged fan, support rotor assembly horizontally and remove fan from rotor with a gear puller. Use the holes provided in fan to attach gear puller tongs. FIGURE 64. ROTOR THROUGH-STUDNUT REMOVAL 52 Redistribution or publication of this document, by any means, is strictly prohibited. 12. If required, removebearingwith agear pullerand accessory crutch (if available)from rotor through stud, Figure 65. 13. Clamp alternator rotor in a fixed vertical or horizontal positionto remove or install the rotor lock nut, Figure 66. Lock nut is torqued to 130-150ft. Ib. (176-203Nom). 0455 FIGURE 65. ROTOR BEARING REMOVAL FIGURE 66.EXCllER ROTOR LOCKING NUT REMOVAL. 53 Redistribution or publication of this document, by any means, is strictly prohibited. 14. If bearing, shaft, or oil seal replacement is required, hold gear case upright and tap drive pinion and shaft through gear case, Figure 67. 16. Remove snap ring from bearing on drive pinion shaft, Figure 68. 17. Press bearing from drive pinion shaft if bearing replacement is required, 15. (Not Illustrated)-With vise grips, remove rotor through-stud from drive pinion shaft. FIGURE 67. REMOVING DRIVE PINION SHAFT FROM GEAR CASE FIGURE 68. DRIVE PINION SHAFT BEARINGi SNAP RING REMOVAL ALTERNATOR ASSEMBLY Use care to prevent damage to the fan blades. Broken fan blades will throw the fan out of balance and reduce the air flow rate. Assemble alternator components in reverse order from disassembly using additional instructions that follow: 1. Clean and inspect all mating surfaces. 2. Coat mating area between alternator bearing and end bell bearing hole with a thin film of Molykote or equal. 6. Install two stator throughstuds in adapter for aligning stator assembly over rotor during assembly. 7. Install baffle ring. 8. Install remaining two stator throughstuds in adapter. 9. Install stator and end. bell. Torque nuts on through-studs to 19 to 21 ft-lbs (26 to 28 Nom). 3. Install rotor-through-stud in drive pinion shaft, if it was removed. 4. Install rotor and fan assembly on adapter. Guide key ‘lotin fan Onto key in drive pinion shaft. A raised line on the fan body casting indicates the location of key slot inside. The drive shaft and key can be seen through the air outlet in the adapter. 5. If they were removed, install exciter rotor and shaft bearing. Hold fan with wooden stick and torque shaft nut against exciter rotor 130to 15Oft. Ibs. (176 to 203 Nom). 10. Torque down rotor-through-stud nut to 55-60 ft. Ib. (75-81 Nom). lnsta’l mounting feet and controlboxl2 Connect alternator Output and control leads according to appropriate wiring diagram. 13. Replace end bell cover. 14. Replace control box cover. 54 Redistribution or publication of this document, by any means, is strictly prohibited. CONTROL SYSTEMS * * GENERAL YD generatorsets use several forms of control boxes and panels as shown in Figures 69 through 72. Instrumentation and control functions vary because of set design,different needs of each installation,and optional equipment ordered by the customer. AC AMMETERS For description and troubleshooting information on the 30 kW SK engine DC controls, see Section 8Aof Master Service Manual 900-0218. VOLTAGE ADJUST RHEOSTAT, RESET BUTTONS. \ FIELD BREcKER CIRCUIT AC VOLTMETER \ LINE CIRCUIT BREAKER PHASE SELECTOR WIT- B218 FIGURE 70. CONTROL PANEL AND OUTPUT BOX AIR-COOLED SET ONLY certain failure modes of the generator, exciter, and voltage regulator. S \ FAULT LAMP Pre-Heat Switch: Provides pre-heat conttol for manifold heater and glow plugs for cold diesel engine starting. METER FIGURE 69. TYPICAL AIR-COOLED’AND MARINE SET CONTROL PANEL . Oil Pressure Gauge: Indicates pressure of lubricating oil in engine (wired to a sensor unit located on the engine). CONTROL PANEL COMPONENTS The following is a brief description of typical controls and instruments on the face of the panels; these may vary according to the customer purchase order. ACVoltmeter: IndicatesACgeneratoroutputvoltage. Voltmeter Phase Selector Switch: Selectsthe phases of the generator output to be measured by the AC voltmeter. Start-Stop Switch: Starts and stops the unit locally. Battery Charge Rate DC Ammeter. Indicates the battery charging current. Voltage Adjust Rheostat: Provides approximately plus or minus 5 percent adjustment of the rated output voltage. Field Circuit Breaker: Provides generator exciter and regulator protection from overheating in the event of CC Redistribution or publication of this document, by any means, is strictly prohibited. AC .AMMETERS WATER TEMPERATURE GAU EMOTE HEATER WITCH UN-STOP SWITCH FIGURE 71. TYPlCAL RAMATOR-COOLED SET CONTROL PANEL Cranking Limiter: Some systems have a thermally activated device that limitscranking 45 to 90seconds depending on ambient temperature. A red pushbutton popsout and cannot be reset until one minute has elapsed. Other solid state systems (DTA) limit crankIng to 45-75 seconds before energizing a fault relay. The relay stops the cranking function and turns on a red Overcrank lamp. set failed to start Overspeed Low oil pressure Pre low oil pressure Low engine temperature High engine temperature Pre high engine temperature Overcrank Start switch in Off position Running Time Metec Registers the total number of hours, to I/lOth that the unit has run. Use it to keep a record for periodic servicing. Time is accumulative; meter cannot be reset. Reset pushbuttons orswitches permit restartingafter ,trouble is corrected. . ) Line Circuit Breaker: Protects generator from line overloads. Frequency Meter: Indicates the frequency of the generator output in hertz. It can be used to check engine speed. (Each hertz equals 30 rpm.) Water Temperature Gauge: Indicates temperature of circulating coolant in engine. (Wired to a sensor unit located on the engine.) Wzrning Lights: Indicator lights are used on some controls to give warning of: 56 Redistribution or publication of this document, by any means, is strictly prohibited. /-\ \-/ START PRIME RESEi WPTESl CONTROL BREAKER REMOTE BREAKER STOP REMOTE FIELD BREAKER @ @ @~~ MDTA SERIES RUN PRE HI ENG TEMP PRE LO OIL PRES 0 8 m 3 PHASE- HI ENG TEMP 0 0 - OVERSPEED RESET VOLTAGE ADJUST START LO ENG TEMP PRIME LAMPTEST OVERCRANK LO OIL PRES SWITCH OFF a REMOTE @@@ 1 PHASE FlELLl CONTROL REMOTE DTA SERIES FIGURE 7 2 TYPICAL CONTROL PANELS, DTA/MDTA I 57 Redistribution or publication of this document, by any means, is strictly prohibited. ENGINE CONTROL SYST.EM OPERATION Dependable, trouble-free operation of the control system should be the major concern of any competent generator set service personnel. Service personnel must thoroughly understand how the controls operate, know how to check for troubles, and know how to make the proper adjustments, replacements, or repairs in a reasonable amount of time. 'If K14should energizeand stop the engine, a brief period is required for the relay's heater to cool before the relay contacts reset to the de-energlzedpositionfor starting again. Start-Disconnect Sequence When engine speed reaches 900 rpm, centrifugal switch S1 closes. This connects B+ to the StartDisconnect Relay K12 via resistor R1 1. The NC contacts of K12 now opens the K11 start circuit. The NO contacts of K12 close to connect B+ (via K14 contacts) to the ignition circuit and fuel control .components. The circuitry, control components, and operating cycles for air-cooled and marine generator sets are similar, however the gasoline and diesel-powered sets are different enough to be described separately. Prior to starting the generator set, check the fuel supply, engine oil level, and all battery connections for loose or broken wires. If an automatic demand control is in use, check for correct connections. # Stopping Sequence Holding S11 in Stop position de-energizes K12 which opens B+ circuit to the ignition system and fuel control components. GASOLINE POWERED SETS The DC start and run circuits are supplied by the 12-volt battery and charge winding of the generator. The control circuits are completed by returning to ground (negative post of battery). DIESEL POWERED SETS The DC start and run circuits are supplied by the 12-volt battery, and by the charge winding of the generator. The control circuits are completed by grounding to the negative pole of the battery. Figure 73shows a typical wiring diagram for gasoline powered sets described in the following Starting, .Start-Disconnect and Stopping sequences. Relay contact references normally open (NO) and normally closed (NC) referto position of contacts with the unit at rest (not energized). .E3 Do not apply overvoltage to the starting circuit at any time. Overvoltage will destroythe glow plugs and air heater in two to three seconds. If it becomes necessary to usean additiomlsourceof powerto star! the unituse a 12-volt battery connected in parallel with the starting bancrier. CAUTION The following starting, startdisconnect and stopping sequences are referenced to the typical control schematic in Figure 74. Starting Sequence The Start-Stop switch i s pressed and held at Start position until the engine starts and runs. E x Test reference to relay contacts normally open (NO) and normally closed (NC) refer to position of contacts with the unit at rest (not energized). 1. The start circuit is completed by Start-Stop switch S11 at the 'Start position. This action energizes Start Relay K11via NCcontacts of the StartDisconnect Ignition Relay K12. 2. Start Relay K11 has two sets of NO contacts performing the following functions when energized: a. One set connects battery B+ to: primer solenoid K3, thermal choke S3, and starter motor shift solenoid B1. b. The other set connects B+ to: the breaker point assembly S3 (via high temperature switch S2 and NC contacts of optional Emergency Relay 'K14), thermal choke heater S3, and other fuel control components. Starting Sequence Do not hold mltch longer than 30 seconds during any attempt to stah Longer periods m y harm the starter motor and dischargebattery needlettly. CAUT,ON 1. For cold engine starting, the Pre-Heat Switch S12 is held in the Heat position for 30 seconds if ambient temperature is above 55OF (43OC); 60 seconds if below 5 5 O F . This action energizes the Manifold Heater Relay K13 which connects battery B+ to the manifold and glow plug heaters HRl-5. After proper pre-heat time, 512 is released and start circuit energized (Step 2). 2. The start circuit is completed by Start-Stop Switch SI1at the Start position. This action energizes Start Relay K11 via NC contacts .of relay K12. Relay K13 is also energized by S11 at Start. 58 Redistribution or publication of this document, by any means, is strictly prohibited. c . I I TI I I C 0IL-IGNITION I I GENERAlOR I 621 RZI lRED!3oR ASSI VRZZ lREGULATOR ASSY-VOLTAGE I W/O V ADJ)4.-CIZ.+S~-OWO. Q.-w VR23 I REGULATOR ASSY -VOLTAGE IW V A D J l - O ~ - O 4 , - O 7 . ~ - l l - l 2 2 d - . l r I I CRII FI I IRECTIFIER a J LEAD ASSY I N S E - I O AMP I KII (02 K14 IRELAY-START S O L W I D I R E L A V # L E I D IdsV IRELAY-EYERGEUCY (LOP1 ' I I 1- I FIGURE 73. TYPICAL GASOLINE ENGINECONTROLSCHEMATIC ~~~ FIGURE 74. TYPICAL DIESEL ENGINECONTROL SCHEMATIC 59 Redistribution or publication of this document, by any means, is strictly prohibited. Start-Disconnect Sequence Umlt cranking 15to 20recondsto con5ewe batteryand prevent possibleharm to the starter motor Bl. When engine speed reaches 900 rpm, centrifugal switch S1 closes. This connects B+ to the StartDisconnect Relay K12 via resistor R l l . The NC contacts of K12 open the cranking circuit. The NO contacts of K12close to keep B+ (via K14contacts) to the fuel solenoid K1 and the fuel pump El. 3. Start Relay K11 has two sets of NO contacts performing the following functions when energized: a. One set connects battery B+ to the starter motor shift solenoid B1. b. The other set connects B+ to the fuel solenoid K1 and optional fuel pump E l via NC contacts of optional Emergency Relay 'K14. a Stopping Sequence Holding SI1 in Stop position de-energizes K12 which opens B+ circuit to the fuel solenoid and pump. The fuel solenoid shaft forces the injection pump control arm to the no-fuel position. The engine stops from lack of fuel. 'If K14 should energize and stop the engine, a brief period Is required for the relay's heater to eo01 before the relay contacts reset to the de-energized position for starting again. , 60 Redistribution or publication of this document, by any means, is strictly prohibited. . , - CAUEE OIL PRESS. .EIUEE WATER TEMP AIIETER CHARGE 5-0-5 RESISTW 3.0HT. 1 0 1 Mll 112 113 - 111 $11 S12 SW 1111 . SWITCH - PANEL LIGHT SllTCH - SELECTOR SWITCH - UNIBLOCK I . mi BLOCK - TERMINAL - TERIIMAL W M USED MOTE: U L E S OTHERWISE 1I1)TED. ALL COIPONEWTS ARE SHOW IN THE ~ M - E W ~ O Zmsiiiow. ED ~~ FIGURE 75. TYPICAL CONTROL SCHEMATIC, RADIATOR-COOLED J-SERIES DIESELENGINE 61 Redistribution or publication of this document, by any means, is strictly prohibited. Oil pressure meter M11. Water temperature meter M12. Fuel solenoid K3. Optional water solenoid K2 and fuel pump E3. Heater Relay K1 via NC contacts of Si3 and K13 (Start-Disconnect Relay). Starter RelayK16via K13and S12. (Relay K16 connects B+ to the B1 starter solenoid and Cranking Limiter Relay K14.) RADIATOR-COOLED DIESEL SETS The control components on the water-cooled, diesel sets are similar to the air-cooled and marine sets, but the circuitry and operating cycles are different. The solid-state control used on the DTNMDTA Series is described separately. The DC start and run circuits are supplied by the 12-volt battery, and by the battery charging system. Do not apply overvoltage to the starting circult at any time. Overvoltage will destroy the glow plugs and air heater In two to three seconds. If it becomes necessary to use an additional source of power to start the unltuse a 12-volt battery connected In parallel with the starting batteries. Start-Disconnect Sequence When engine reaches about 900 rpm, centrifugal switch S4 closes and energizes relays K12 and K13 (Oil Pressure and Start-Disconnect). The NC contacts of K13 opens the K16 Starter Relay circuit and starter.solenoid BI. Prior to starting, check the fuel supply, engine oil level, and all battery connections for loose or broken wires. If an automatic demand control is in use, check for correct connections and make sure the selector switch is in Remote position. Stopping Sequence Positioning selector switch S12 to Stop position disconnects B+ voltage from the control circuits; thereby de-energizing all control components required to operate the engine in either Run or Remote condition. Figure 75 shows a typical schematic diagram for radiator cooled diesel sets described in the following Starting, Start-Disconnect and Stopping sequences. Emergency Shutdown Emergency Shutdown Relay K15is controlled by any one of three switches: S1 low oil pressure, S2 high water temperature, and S3 overspeed. Contacts of K15 control two circuits: one normally closed set of K15 contacts controls the fuel solenoid relay coil to shut off the fuel supply to the engine; the other normallyopensetclosestolightthe pilot lightandsetoff the emergency alarm whenever the emergency shutdown relay energizes. Starting Sequence The following sequence of electrical functions occur during the starting operation. Relay contact text references normally open (NO) and normally closed (NC) refer to position of contacts with the unit at rest (not energized). . With S12 in the Remote position, the operator can start the set from a remote location, or by an automatic demand control. Inthis position only is engine preheating controlled automatically by 20 second Time Delay Relay K17. Relay K17 is energized by B+ connected through the remote switch, and through S12 in the Remote position. CONTROL OPERATION (DTNMDTA SERIES) Manual starting at the set involves the following sequence of electrical and mechanical functions: 1. For cold engine starting, the Pre-Heat Switch S13 is held in the Heat position for 30seconds if below 55°F (13OC); 60 seconds if below 55OF. This action energizes the Heater Relay K1 which connects B+ to the manifold and glow plug heaters HR1-5. After proper pre-heattime, Sl3is released and the start circuit energized (Step 2). , 2. The start circuit is completed when the selector switch is moved to the Run position. This action energizes Fuel Relay K11 via normally closed contacts K14 and K15 (Cranking Limiter and Emergency Shutdown Relays). When K11 contacts close, B+ energizes the following components. Figures 76and 77show the PC board and DCcontrol' schematics for the solid state control. Relay contact text references normally open (NO)and normally closed (NC) referto position of contacts with the unit at rest (not energized). Starting Sequence The start circuit is completed by switch S10 in the. Start position. This action energizes On/Off Relay K2 which puts B+atStopSolenoid KSand Fuel Pump E l ' (via contacts K2, K1 and J1-4). As K5 energizes, its NC contacts open and allow the Starter Pilot Relay K4 to energize (via contacts K2, K1, K3, J1-6, K6, P1-16 and K5 auxiliary coil to ground). The K4 contacts connect B+ to the Starter Motor Solenoid K and cranking begins. .62 Redistribution or publication of this document, by any means, is strictly prohibited. 300-1696 ENGINE MONITOR PCB .' I t I I . FIGURE 76. DC CONTROL SCHEMATIC DTNMDTA (OPTIONAL METERING) 63 Redistribution or publication of this document, by any means, is strictly prohibited. Emergency Shutdown Fault Relay K1 can be energized by any of several sensors as follows: S3 low oil pressure switch, S5 Start-Disconnect Sequence When cranking begins, the solid-state crank-limiter timer is activated. If engine does not start in 45-75 seconds, Fault Relay K1 energizes and cranking stops. Engine start is determined when voltage output at auxiliary terminal of the belt driven alternator energizes the Start-Disconnect Relay K3. Relay K3 stops the timer sequence and opens the cranking circuit. Stopping Sequence high engine temperature switch, S7 overspeed switch, OC (overcrank) Limiter. When K1 is energized, a NC set of contacts open B+ to the Stop Solenoid and Fuel Pump, and another set closes to connect B+ to an optional fault alarm. The engine sensor causing the fault triggers a transistor circuitthat lights up theappropriate fault lamp on the control panel. Theengine cannot be started until fault condition is corrected and the Reset Switch S12 pressed. ' Placing switch S10 in Stop position de-energizes relay K2 which opens B+ circuit to the Stop Solenoid and Fuel Pump. The Stop Solenoid connecting rod movesthe injectionpump control tothe no-fuel position. The engine stops from lack of fuel. The Low Oil Pressure Delay circuit is not .actuated until the Start-Disconnect Relay is energized. The circuit allows a delay of 7.5 to 12.5 seconds before LOPshutdownand prealarm are functional. Following this initial delay, both the LOP shutdown and pre-alann functions are immectiate. 64 Redistribution or publication of this document, by any means, is strictly prohibited. . 1. 1136 I ~ I S T O I I(ID~,I/N,W TRUSISTM- SIONALIYPS 653OEOl.4 DIODE-400V 14041 (-OI.-oL) SILKSCREEN- PC -0 (-05) SLISQIEEH- PC WARD (-02) SOLDER-BAR IGPROGIMA8LE TIMER TEWINAL BLOCK4 PLC 1-01.42) TEWINAL BLOCK-12 PLC UI-2 782 TBI -1.5%) tSO.33 e RESISTOR (IOOK.1/21.5Z) R29.34 2 AZO-26 7 RESlSTOR (47K,IL?N,55) RESISTOR (lOO.l/ZW.%) RESISTOR (6EO,l/ZW.%) R7.9.11.13.15. 7 17.19 R35 I R l b . E . I O . 12.14 15 16.18.27.28.32 RESISTOR ( Z 7 0 4 ~ , 5 % ) ( - 0 2 ) RESlSlOR (lOK.lL?W.S%) (111-17 7 TRANSISTORSIMIL (UPS 6533) P4.5.7-IO.I8 (11-3 7 TRANSISTORSIMIL (UPS 6530) (92W45A) REUY-MIN OPDl REUY-SPST K3 K2 KI 11-3 3 1 I I 3 I TmsisrnR C12.9 CI I c8.10 2 I 2 CAPACITOR $1-7 7 111 REF.Dp. 27 I NOTE 1. USE CR29 FOR -01 8-03, USE R25 FOR -02 REUV-TPDT PUIGCMHECTOR OIODE4OOY (IR6054) OIOOE-4OOY (404) DIODE- 4OOV 14D41(-01,-03) CIPACITOR-TANT 147YFO.20V) WACITOR LO22 YFD.4OOV) CR12 CR13- I1.B-28.32 CA29 DASH NO. (.ism. I oov) _--.. . I ma . FIGURE 77. ENGINE MONITOR PCB SCHEMATIC 300.1896 (DTNMDTA) 65 Redistribution or publication of this document, by any means, is strictly prohibited. a a W a 9 W z f 6 b w a 3 0 E 66 Redistribution or publication of this document, by any means, is strictly prohibited. The data in this section is divided into three flow charts, and information on troubleshooting the DTA/MDTA solid-state control (page The flow charts consist of: A. Engine does not crank. B. Engine cranks but does not start. C. Engine starts but stops when start switch is released. Before starting a troubleshooting procedure, make a few simple checks that may expose the problem and cut down on troubleshooting time. a). Check all modifications, repairs, replacements performed since last satisfactoryoperation of set. A loose wire connection overlooked when installing a replacementpart could cause problems. An incorrectconnection, an openedswitch or circuit breaker, or a loose plug-in are all potential problems that can be eliminated by a visual check. Unlessabsolutely sure that panel instrumentsare accurate, use portable test meters for troubleshooting. To troubleshoot a problem, start at the upper-left corner of chartand answerall questions eitherYESor NO. Followthe chart until the problem is found, performing referenced Control Component Checkout procedures on page 70. Refer to typical wiring diagrams in Figures 78 and 79for locating control component leads, terminals and other check points. Check for correctvoltage at terminal blocks as shown below. Measure voltage between terminal and ground, or as indicated. TBll-B+. ............................................ 12VDC ............................................ GROUND TBll-2 ....................................l2VDC RUNNING TBll-3 .................................... l2VDC STOPPED TB11-1 .................................... l2VDC STOPPED .................................... l2VDC RUNNING ................................... -12VDC RUNNING .................. 0-VDC STOPPED, l2VDC RUNNING ......................................... 19 to 21 VAC .................................. .120 to 139VAC .............................................. 12 VDC ............................ .7 to 9 VDC ON CRANKING ................................. 12 VDC ON PREHEAT TB11-H -12-4 TB12-5 1612-6 TB12-7 TB21-1 to 2 K11-B+ K11-S K13-H FLOW CHART A. ENGINE DOES NOT CRANK START Check batteryper Checkout [A] and recharge or replace. (NOTE: Centrifugal switch S1 and diode CRll can cause battery discharge. See Checkouts IC]and [HI). Is battery dead? - Check engine oil level. If OK, reset relay. Check oil pressure switch S4 and related wiring. Is LOP emergency relay K14 tripped? ’ 1 Jumper battery cable B+ connection to 61starker solenoid terminal. Does engine crank? With Si1 in Start position, does start solenoid K11 energize? (Is at least 7 volts DC present between K11 terminal S and ground?) Is at least 7volts DC present between B1 starter solenoid terminal and ground? + + Check battery cables for clean and tight connections (ref. Checkout [B]). Check B7 starter solenoidand motor if bad, repair or replace. + Check solenoid K11, relay K12, Start/Stop switch S11 and associated wiring and connections per Checkouts P I , [El and [GI. - Check wiring and connections between K11 terminal S and the solenoid terminal of 81. L Redistribution or publication of this document, by any means, is strictly prohibited. DIESEL ENGINE START t (Also see "Onan Diesel Starting Guide," page 71) Does fuel transfer pump El and solenoid K1 operate when SI1 is in Start position? Check relays K11, K12 and K14 per Checkouts [D]and [E].Check wiring. Replacetransfer pump El if defective. no Yes I 3 Isengine getting fuel? (Exhaust smoke should be blue-whiie. and fuel flow steady from fuel return line.) Check fuel supply system: fuel tank, shutoff valves, fuel lines and connections, fuel filters and pumps. I I - Is preheat system operating properly? I Check heatersolenoid K13 and switch S12per Checkouts [D]and [GI.Check wiring and heater elements. Incorrectfuel? (See Operator's Manual recommendations.) I f GASOLINE ENGINE - Does fuel primer solenoid K3 energize when S11 is in Start position? Is carburetor choke operation proper? Check solenoid K3 and related wiring. Repair or replace as needed. Check electric choke components and wiring (if used). -no-, .Adjust per Operator's Manual instructions. I Yes ' 1 I Check ignition components: points, condenser, plugs, distributor, wiring, and HETCO. Battery voltage must appear at coil during cranking. Is ample spark ignition voltage available at spark plugs? cI Is fuel pump OK? Does fuel pulsate from line removed at carburetor? Use extreme care for this test. Run fuel into a suitable container and makesure area iswell ventilatedto prevent an explosion or flre and resultingpersonalinjury or death. 68 I I L Check fuel supply system: fuel tank, shutoff valves, fuel lines and connections, fuel filters and pumps. Redistribution or publication of this document, by any means, is strictly prohibited. I I FLOW CHART C. ENGINE STARTS BUT STOPS WHEN START SWITCH IS RELEASED START Check centrifugal switch S I and related wiring. S1 should close at about 900 rpm and connect battery B+ to Connect voltmeter from TB12-5 to ground. Is battery -novoltage indicated as engine rpm increases? TB12-5. 7 Check resistor R11 per Checkout [FJ.If OK, check relay K12 switch S11 and relatedwiring for short to ground. Connect voltmeter to other side of resistor R11 (either at relay KlPor Stop terminal of S11). Is batteryvoltage read at rpm increase? Jumper normally open contacts of relay K12 Does engine start and run? no---, ' Check wire between relay K12 and ammeter M11. Yes 1 I Replace relay K12 TROUBLESHOOTING DTNMDTA DC ENGINE CONTROL Refer to Control Operation and the schematic in Figure 76 when troubleshooting this control. Repair information is not extensive since the solid-state printed circuit board lends itself more to replacement than repair. External components such as leads, switches, indicator lights, relays, gauge senders, circuit breakers, DCvoltage regulator, etc., plug into the board. * t If an external component is suspected of causing a problem, disconnect its associated jack (51, J2or 53) from the board (Figure 80) and check continuity of wiring and the component. Note some switches are NC and some NO with unit at rest. Individual components can be checked out simularily as referenced in "Control Component Checkout" on page 70. FIGURE 80. LOCATION OF JACKS AND RELAYS'ON ENGINE MONITOR BOARD 300-1896 Redistribution or publication of this document, by any means, is strictly prohibited. CONTROL COMPONENT CHECKOUT The following component checkouts are referenced in the Control Troubleshooting flow charts, pages 67 to 69. They are an aid to isolating circuit problems caused by faulty engine control components. SOLENOID CHECKOUT 1. Apply 12 volts to battery terminal. 2. Jumper a ground wire to terminal marked “S.” Solenoid should activate. 3. If contacts are good, 12 volts should be read between terminal S1 and ground. The voltage drop measured across contacts should never exceed 1volt in circuit application. BATTERY CHECKOUT Check charge condition of the battery with a hydrometer. The electrolyte specific gravity should be about 1.260forafullycharged battery at 80” F (27OC). If not, add approved water to keep electrolyte at proper level and recharge the battery. If battery will not recharge, replace it. [El RELAY CHECKOUT If the battery loses excess water, the generator charge rate may be set too high. Likewise, if battery state of charge is not maintained, the charge rate may betoo low. Set charge rate per Adjustment Procedure [C] in the Generator Troubleshooting section (page 10). 1. Connect 12 volts across relay coil terminals. Relay should activate if coil is okay. 2. Connect a 12-volt source to one side of relay contacts. 3. Connect a voltmeter to other side of relay contact and 12-volt source. If 12volts appearswhen relay is energized, contact is okay. The 12-volt reading appears in reverseorder when checking normally closed (NC) contacts. BATTERY CABLE CHECKOUT With the starter motor operating, check the voltage drops (1) from the battery negative post (not the cable clamp) to the cylinder block, (2) from the battery positive post to the battery terminal stud on the solenoid. Normally, each of theseshould be lessthan 0.3 volt. If extra long battery cables are used, slightly higher voltagedrops may result. Thoroughlyclean all connections in any part of the circuit showing excessive voltage drop. RESISTOR CHECKOUT 1. Remove battery B+ cable. 2. Disconnect one side of resistor and using an ohmmeter measure across resistor for an accurate reading. SWITCH CHECKOUT RECTIFIER CHECKOUT 1. Remove battery B+ cable. 2. Place ohmmeter leads across switch. 3. Activate switch. If meter reads continuity, switch is good. Disconnect one lead from, or remove, each rectifier for its individual test. Note carefully the direction of mounting of any rectifier removed. I1must be remounted in its original direction. 1. Connect the ohmmeter across the rectifier contacts and observe the meter reading. 2. Reverse the connections and compare the new reading with the first reading. 3. If one reading is considerably higher than the other reading, the rectifier can be considered satisfactory. However, if both readingsare low, or if both indicate an “open” circuit, replacethe rectifier with a new identical part. CENTRIFUGAL SWITCH CHECKOUT The start-disconnect switch is located on the gear cover on the side of the engine abovethe oil filter. The switch opens when theengine stops and closes when the engine speed reaches about 900 rpm. Check the switch contacts for pitting. If necessary, loosen the stationary contact and adjust the point gap at 0.020 inch (0.51 mm). Replace burned or faulty points. 70 Redistribution or publication of this document, by any means, is strictly prohibited. 8 ONAN DIESEL STARTING GUIDE IMPORTANT! KEEP ENTIRE FUEL SYSTEM CLEAN AND FREE FROM WATER DIESEL INJECTION PUMPS WILL FAIL IF SYSTEM CLEANLINESS IS NEGLECTED L FUEL TRANSFER INJECTION PUMPS AND NOZZLES ARE NOT FIELD REPAIRABLE WHEN TROUBLESHOOTING. CHECK ALL OTHER COMPONENTS FIRST .- = FUEL RETURN NE CONNECTION DO NOT I E E ETHER STARTING AIDS! ETHER IS EXTREMELY EXPLOSIVE AND MAY CAUSE SERIOUS PERSONAL INJURY. ENGINE DAMAGE IS ALSO LIKELY. . WARNING BEFORE STARTING: I a INJECTION PUMP I CHECK FUEL SUPPLY. BE SURE SHUTOFF VALVES ARE OPEN. TO PRIME PUMP. MOVE PRIMING LEVER UP AND DOWN UNTIL FUEL FLOWS STEADILY FROM RETURN LINE (DISCONNECTED). PREHEAT COLD ENGINE PUSH PREHEATSWITCHAND HOLD 30 SECONDS IF ABOVE % O F (13oC); 60 SECONDS IF BELOW 55'F (13eC). TO START I I PRIMEFUELSYSTEMIF:FUELFILTERSWERE DRAINEDOR CHANGED, SYSTEM WAS JUST INSTALLED. FUEL TANK RAN DRY. I RELEASE PREHEAT - ENGAGE START SWITCH ' STOP LIMIT CRANKING TO 15 TO 20 SECONDS TO CONSERVE BARRY. IF ENGINE DOES NOT STARE ALLOW? MINUTE I ' BEFORE RE- CRANKING. IF ENGINE FIRED, REPEAT ABOVE PROCEDURES, INCLUDING PREHEAT. IF IT STILL DOES NOT START, PROCEED AS FOLLOWS I TEMPERATURES BELOW 3 2 0 (ooc]: ~ I USE NUMBER 1 DIESEL FUEL USE CORRECT VISCOSITY OIL. KEEP BATTERIES FULLY CHARGED. DO NOT USE ETHER STARTING AID. I I _. OBSERVE ENGINE EXHAUST "SIGNALS": 1I I BLUE-WHITE EXHAUST SMOKE: ENGINEIS GETTING FUEL I LITTLE OR NO EXHAUST SMOKE ENGINE IS NOT GETTING FUEL. PRIME FUEL SYSTEM AS SHOWN ABOVE OBSERVE FUEL FLOW FROM RETURN LINE 1 I I I I I I FUEL FLOWS STEADILY CHECK PREHEATSYSTEM: 1. OBSERVE AIR HEATER THRU AIR INLET HOLEOR BY REMOVING AIR CLEANER. 2. ENGAGE PREHEAT. 3. IFHEATERELEMENTDOESNOT GLOW RED WITHIN 30 SECONDS, CHECK AIR HEATER AND GLOW PLUG WIRING CONNECTIONS TIGHT? FREE FROM CORROSION? 2-79 I CHECK FUEL SOLENOID SOLENOID ROD SHOULD PULL IN AND THROlTLE ARM FOLLOW (AS SHOWN) WHEN START SWITCH IS TURNED ON. IF NOT, CHECK FOR NG LINKAGE E OR BROKEN WIRES OLENOID ROD THROTTLE ARM 900-0217 CHECK FUEL SUPPLY SYSTEM: FUEL TANK EMPTY? SHUTOFF VALVES CLOSED? FUEL LINES KINKED? LOOSE CONNECTIONS? CLOGGED FUEL FILTERS? ' I I IF ENGINE IS STILL NOT GETTING FUEL, CHECK TRANSFER PUMP: 1. CRANK ENGINE AND OBSERVE FUEL FLOW FROM RETURN LINE. 2. IF FUEL DOES NOT SPURT OUT. PUMP MAY BE DEFECTIVE. I IF ENGINE STILL DOES NOT START. CONTACT AUTHORIZED ONAN SERVICE REPRESENTATIVE 71 I Redistribution or publication of this document, by any means, is strictly prohibited. WIRING DIAGRAMS The wiring and schematic diagrams in this section represent typical air-cooled, marine, and radiator cooled engine driven YD generator sets. Wiring diagrams for special order generator sets are shipped with the units and should be referred to whenever possible. kW RATING MODEL DRAWING NUMBER PAGE 612-4791 73 DJB DJC DJB,DJE DJC MDJC UDJE MDJF 4.5 & 6.0 (Code 18,518,3C, and 53C) 9.0 & 120 4.5 & 6.0 (with LOPswitch) 9.0 & 120 (with LOP switch) 7.5 12.0 & 15.0 612-4791 612-4792 612-4792 612-4792 612-4B2 612-4792 JB JC 6.0 & 7.5 15.0 612-4793 ,612-4793 75 JB JC MJC 6.0 & 7.5 (with 'LOP switch) 12.5 & 15.0 (with LOP switch) 76 10.0 & 15.0 612-4794 612-4794 612-4794 JC RJC RDJC 12.5 (Code 18 & 518 120/240V) 12.5 (Code 18 & 518 120/240V) 17.5 (Code 18 & 518 120/240V) 612-4816 612-4816 612-4816 77 RJC RDJC 12.5 (Code 18 277/480V) 17.5 (Code 18 277/480V) 612-4817 612-4817 78 JC RJC RDJF 12.5 (Code 18 120/240V) 12.5 (Code 18 120/240V) 17.5 (Code 18 120/240V) 612-4818 612-4818 612-4818 79 MDTA/DTA 25.0 (Code 3CR & 15R) 612-5799 80 612-2730 81 305-0532 305-0534 305-0579 3050618 620-0155 620-0156 620-0193 620-0205 82 83 84 85 88 87 87 620-0153 620-0154 88 88 1Q;O RDJC/RDJF Engine Control Voltage Regulator Assembly (Air-Cooled and Marine Sets) Voltage Regulator Assembly (Radiator Cooled Sets) Typical Single-phase PTO Alternator Typical Three-phase PTO Alternator 30.0 kW YD PTO Alternator Control Typical Two-Bearing Alternator (Single and Three Phase with Circuit Breaker CB21) . Typical Two-Bearing Alternator (Single and Three Phase) - 74 84 - NOTE:Special order generatorsets with optional specificationcodes such as, 4R-,4XR-, and 5 D R 60 Hertz: 5R and 55R 50 Hertz; and many others are basic 18R 60 Hertz or 518R 50 Hertz and 3C 60 Hertz or 53C 50 Hertz generators. Optional meter equipment and voltage output capabilities change the specification codes of these units and each wiring arrangement is slightly different. - - - 72 - Redistribution or publication of this document, by any means, is strictly prohibited. > 0 c I I I 73 Redistribution or publication of this document, by any means, is strictly prohibited. I I I I I m L 74 Redistribution or publication of this document, by any means, is strictly prohibited. 5 a e, a 2 0 B 5 f u) 0 I I x 0 m i $1 i II i I a e, n 5 75 Redistribution or publication of this document, by any means, is strictly prohibited. U I 1' t I I Redistribution or publication of this document, by any means, is strictly prohibited. I p W L Redistribution or publication of this document, by any means, is strictly prohibited. I- CE 3 w It I I IW o_ u) z Redistribution or publication of this document, by any means, is strictly prohibited. Redistribution or publication of this document, by any means, is strictly prohibited. L I - I -----_..- I a 0 w u Y 80 Redistribution or publication of this document, by any means, is strictly prohibited. I I I I I I I $1 I 3 :I a1 I I tl de; I 81 Redistribution or publication of this document, by any means, is strictly prohibited. i 0 \ \ \ " \N s 0 0 ai Redistribution or publication of this document, by any means, is strictly prohibited. P 83 Redistribution or publication of this document, by any means, is strictly prohibited. RADIATOR COOLED SETS PLKFMSM CDMCTlDn (Ill) p'p / ' \ @@ XI TO YRI-¶ 1. x2 TO n1-lo C. HI TO TI24 0. ws TO m-1 RADIATOR COOLED AND PTO MODELS / / I A. / \ Redistribution or publication of this document, by any means, is strictly prohibited. I" -. r- --1 I. I - 1 85 Redistribution or publication of this document, by any means, is strictly prohibited. I 86 Redistribution or publication of this document, by any means, is strictly prohibited. 6a i- z 0 0 a Ea Ew 13a 0 k ~ * 0 " - 3 Y . I e 87 \ Redistribution or publication of this document, by any means, is strictly prohibited. 8 @Y c 2 z W W a I c 5 I- ?$" 88 Redistribution or publication of this document, by any means, is strictly prohibited. I b~ A I TI I TL ---- I I -e M5 I I I I I I M3 I I I REAR V I E W 7 6 Et 4 3 2 TERM I N A L BLOCK C I R C U I T BREAKER T R A NS F 0 RME R - CUR R ENT t4 E TER - F R EQ U ENC 7 METER-T I ME T O T A L I Z I NG I4ETER-AC VOLTAGE TB 1 ICB 1 l C T l .CT2 M5 1.14 t;i 3 Redistribution or publication of this document, by any means, is strictly prohibited. - AC WIRING DIAGRAM - A C SCHEMATIC - ELECTRONIC REG 50/60HZ ELECTRONIC REGULATION 50/6OHZ NOTES: 1. CUT LEADS 3 8 4 FROM L 2 1 . THESE LEADS ARE NOT USED. T21 2. UNLESS OTHERWSE NOTED. ALL COMPONENTS ARE SXQW IN DEENEROltED POSITION. 3. DASMED LINES INDICATE CONNECTIDNS W E N USE0 HI XZ .- i 1 I I I I I I _I I I I I I -- I' I C821 1 I I I I I I I i -r- RECONNECTION O I A O X M I TRANSFORMER-VOLT REF REACTOR ASSY-COM GENE2ATOR ( A C ) C I R C U I T BREAKER-LOAD C I RCU I T BREAKER-MAG 3 A REGULATOR-ASSY V O L T DEC;CTdF;TI&hl LXI MATErjkL T21 1 CMR2 G2 1 CBZZ CB2 I VRZ 1 LZ . TOP EOOE 16 Redistribution or publication of this document, by any means, is strictly prohibited. Redistribution or publication of this document, by any means, is strictly prohibited. Onan Corporation 1400 73rd Avenue N.E. Minneapolis, MN.55432 1-800-888-ONAN 612-!574-5000 International Use Telex: 275477 Fax: 612-574-8087 Onan is a registered trademark of Onan Corporation Redistribution or publication of this document, by any means, is strictly prohibited.
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