TN835 1 High Current Power Supplies Codan AC To DC
User Manual: 8. Other | LMR & HF Radio | Codan Radio
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TECHNICAL NOTES MT-3/4 Radio Systems TN835 High Current AC to DC Power Supplies The PSA-12-40-RB-00 and PSA-12-60-RB-00 AC switching power supplies provide a regulated +13.8 Vdc to the output terminals. The power supplies are 19” rack mountable and include battery revert capability. An input fuse, electronic current limiting and voltage limiting protection, transient voltage suppressor and thermistor are built into the unit as standard protection to safeguard the unit from abnormal conditions. The power supply uses active current sharing technology to distribute the load current among two or three 20 Amp modules. This reduces stress on individual components and increases reliability. For remote sensing, status signals are available on the rear of the power supply on a female DB25 connector. REDUNDANT POWER SUPPLY SYSTEM STATUS DC / Output AC / Input on Module 1 off on Module 2 off on Module 3 off on Module 4 off ON OFF Specifications Input Voltage Range Input Frequency Range Output Voltage Output Current 120 Vac or 220 Vac (Switch Selectable) 50 / 60 Hz +13.8 Vdc 40 Amps continuous @ +13.8 Vdc (+60°C) PSA-12-40-RB-00 60 Amps continuous @ +13.8 Vdc (+60°C) PSA-12-60-RB-00 -40°C to +60°C continuous duty Operating Temperature Installation 1. Mount the unit to the 19” rack. 2. Select the input voltage by sliding both AC voltage select switches on the rear of the power supply. Be certain that both switches are on the same voltage setting. WARNING: Damage to the unit and personal injury might occur if both the AC voltage select switches are not set on the same voltage setting. 3. Connect the load to the output terminal block connector marked “SYSTEM”, with proper polarities in mind. Tighten the output terminal block screws to secure the wires. 4. Connect the backup battery (if applicable) to the output terminal block connector marked “BATT”, with proper polarities in mind. Tighten the output terminal block screws to secure the wires. 5. While the switch is in the OFF position, connect the supplied AC power cord to the AC input socket. 6. Plug the unit into an AC source capable of handling the rated input current (7 Amps or 12 Amps). 7. Turn the AC switch (located on the front panel) to the ON position to operate the unit. 43 Erie Street Victoria, B.C. Canada V8V 1P8 TN835 Rev 1-1-0 Toll Free Canada & U.S.A. Phone: 1-800-664-4066 Fax: 1-877-750-0004 Mar 13 International Phone: 250-382-8268 Fax: 250-382-6139 © 2013 Codan Limited All rights reserved. Internet Email: LMRsales@codanradio.com Web: www.codanradio.com Page 1 of 2 TECHNICAL NOTES MT-3/4 Radio Systems TN835 High Current AC to DC Power Supplies Battery Backup During normal operation, the power supply provides all of the necessary power to the output while float charging the battery that is connected at the battery backup output. In the event that the AC power source is interrupted, the battery will start to supply power to the load through an isolation diode; however, the load voltage will be 0.4 Vdc lower than the battery voltage. The power resistors used to float charge the battery limit the charging current to a value based on a 100Ah deep cycle battery. Alarm and Status Signals For remote monitoring, the power supply is equipped with a female DB25 connector (on the rear of the power supply behind a protective panel) that outputs various alarm and status signals such as: Pin Number Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin Description AC Good signal +5 Vdc reference signal No connection Fan Good signal No connection Current signal Module 1 Good signal Pin 8 Pin 9 Pin 10 Pin 11 Pin 12 Pin 13 Pin 14-15 Module 2 Good signal Module 3 Good signal Module 4 Good signal No connection Temp warning signal System VOUT Signal Ground 13 25 Voltage Out +15 Vdc if AC Voltage present / 0 Vdc if AC voltage not available +5 Vdc N/C +5 Vdc if both fans are good / 0 Vdc if one or both fans not functioning N/C System current out analog signal (0 Vdc ~ +5 Vdc) +5 Vdc If Module is Good 0 Vdc If Module is not functioning or not present N/C +5 Vdc if the temperature inside the unit is over 48°C +13.8 Vdc Ground 1 14 Figure 1: Pin Layout of the DB25 Connector LED Status Display An LED status indicator (located on the front panel) identifies how many modules are connected on the board and are working. The display also shows the status of the AC input and the DC output signals. The green LED status indicator will be lit when: • AC line voltage is preset • DC output voltage is present • Module voltage is present The yellow LED status indicator will be lit when: • Module is not present in the slot • Module is not producing any output 43 Erie Street Victoria, B.C. Canada V8V 1P8 Page 2 of 2 Toll Free Canada & U.S.A. Phone: 1-800-664-4066 Fax: 1-877-750-0004 International Phone: 250-382-8268 Fax: 250-382-6139 © 2013 Codan Limited All rights reserved. Internet Email: LMRsales@codanradio.com Web: www.codanradio.com TN835 Rev 1-1-0 Mar 13
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