Hubbell Euclid Lifting Magnet Controller 4291 Users Manual Specification
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2015-02-09
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Hubbell Industrial Controls Euclid™ Lifting Magnet Controller Varistor Type Automatic Discharge 4291 Specification 4291 • May 2004 • Replaces July 1990 General Information The Euclid Type 4291 Magnet Controller is for use with all types and makes of lifting magnets. It assures fast and clean release of all types of magnet loads. All or just part of the load may be dribbled, if desired. In addition, because of the circuit design, the magnet and magnet leads are not subjected to high induced voltages. ♦Automatically discharges magnet. ♦ Fast and clean release of load. ♦ Peak magnet induced voltage limited to under 700 volts. ♦Wide reverse current adjustment for different types of magnet loads. ♦ Mechanically interlocked mill-type “Lift” and “Drop” contactors. ♦High-thermal capacity varistor discharge. ♦ Permanently connected discharge path. ♦ Discharge path completely independent from the line. ♦ “Drop” contactor opens automatically at end of drop cycle. ♦Front wired, front removable components. ♦ Long contact life. Euclid Lifting Magnet Controllers Provide 3-Way Release of Load Euclid Type 4291 automatic discharge type magnet controller is the only one on the market today that will assure (1) fast and clean release of full load, (2) accurate release of partial load and (3) precise control of dribbling. It can be used with all types and makes of lifting magnets in any industrial application. ♦ Minimum maintenance. ♦ Full voltage reverse current. ♦ NEMA 3R Enclosed Application Euclid Type 4291 Lifting Magnet Controllers have many uses from light scrap handling to extremely heavy plate or billet handling. The flexibility of this magnet controller is illustrated by the ease of proper “cleaning” that can be accomplished when switching from one type of material to another. A simple adjustment of the potentiometer (P1) is all that is necessary. An inherent dribble characteristic is designed into each unit allowing material sorting such as steel plate stacking, by releasing one plate at a time. Description The Euclid Type 4291 Magnet Controller incorporates time proven components arranged to provide a new concept in magnet controller design and operation. This controller includes all necessary power and reverse current contactors in addition to discharge path components. Euclid’s standard mill-type contactors are used to carry the power to the magnet. The Page 1 of 4 reverse current or “Drop” contactor is also a mill-type contactor. The commonly used discharge resistor has been replaced by a high thermal capacity varistor connected in series with a silicon rectifier to assure a permanently connected independent discharge path at all times around the magnet. Main power of “Lift” contactors, due to the circuit design described herein, need only Euclid’s exclusive arc-centering, high-arc interrupting system to handle the highly inductive magnet circuit. The high thermal capacity of the nonlinear varistor dissipates the energy stored in the magnet at a much lower value of induced voltage than does the usual fixed type discharge resistor. The varistor assembly is a bank of silicon-carbide composition discs connected in parallel and cooled by aluminum radiating plates. The maximum induced voltage permitted by the varistor is a peak of 700 volts. This feature assures extra protection of the magnet and lead system insulation. It also minimizes destructive arcing on the "Lift" contactor. Non-linear characteristics of the varistor help maintain the discharge voltage at the maximum allowable voltage until all of the stored magnet energy is dissipated. The Euclid Type 4291 Magnet Controller dissipates stored energy as fast as any comparable device, but with a much lower induced voltage. It is not necessary to close the "Drop" contactor immediately to provide a discharge path. Full line voltage, for cleaning the magnet, is applied to the magnet terminals when the value of the induced magnet voltage declines to nearly the line voltage value. Resistors are eliminated from the reverse current circuit. This allows the reverse current to build up as fast as the magnet inductive characteristics will permit. During the time of the stored energy dissipation, the reverse voltage across the magnet and the discharge varistor assembly signals the discharge Sensor Module (DSM) that the discharge cycle has begun. When the discharge voltage falls to 250 to 300 volts, the "DSM" closes a pilot Drop Relay (DR) that energizes the Drop Contactor (D). The adjustable time reverse current cycle begins with the closing of the Drop Relay after practically all the stored magnet energy is dissipated by the Discharge Varistor (DVA) assembly. The DSM also controls the length of the reverse current cycle. After a preset Euclid Lifting Magnet Controllers: Automatic Discharge period, controlled by the Potentiometer (P1) assembly, the DSM de-energizes the Drop Relay. This causes the Drop contactor to open and end the reverse current cycle. The remaining reverse magnet current flows through a secondary discharge path from the magnet through the normally closed "power auxiliary" interlock of 2L, the DVA and back to the magnet. The Euclid magnet controller can be operated by a small notched position master switch or a maintained contact-type pushbutton station. Specifications 4291 The arrangement of the circuit components allows an operator to drop portions of a load with ease. This is a feature most operators will appreciate. A portion of the load can be dropped by merely moving the master switch only the distance necessary to momentarily de-energize the "Lift" contactor. This feature is possible because of the permanently connected discharge path and the elimination of having to close the "Drop" contactor before opening the "Lift" contactor. FANNING PACKAGE includes Fanning Contactor and Fanning Resistor for separate Comparison ChartSchematic Diagram Symbol Page 2 of 4 mounting suitably enclosed for NEMA 2 or NEMA 3R service. Fanning is the insertion of a resistor discharge path in parallel with the DVA to give extended magnet discharge time that is activated by a separate fanning pushbutton. The operator is allowed to control the rate of magnet discharge, dropping all or part of the load, by activating the fanning control. Releasing the fanning pushbutton deactivates the fanning control and returns the magnet controller to the lift mode to retain the remaining magnet load. Schematic Diagram Function Symbol Function DR DROP RELAY MOV SURGE SUPPRESSOR PI POTENTIOMETER ASSEMBLY DVA DISCHARGE VARISTOR CFU CONTROL FUSE DSM DISCHARGE SENSOR MODULE RFU DROP FUSE D DROP CONTACTOR DI DIODE 2L LIFT CONTACTOR RECT RECTIFIER, MAGNET DISCHARGE PATH 1L LIFT CONTACTOR ! ! 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File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.4 Linearized : Yes Encryption : Standard V1.2 (40-bit) User Access : Print, Copy, Annotate, Fill forms, Extract, Assemble, Print high-res Create Date : 2006:08:10 09:56:06-04:00 Modify Date : 2007:02:14 16:01:34-05:00 Subject : Euclid™ Lifting Magnet Controller Page Count : 4 Author : Jonathan King Producer : OpenOffice.org 2.0 Creation Date : 2006:08:10 09:56:06-04:00 Mod Date : 2007:02:14 16:01:34-05:00 Metadata Date : 2007:02:14 16:01:34-05:00 Title : Specification 4291 Creator : Jonathan King Description : Euclid™ Lifting Magnet ControllerEXIF Metadata provided by EXIF.tools