
Maintenance and Troubleshooting
ADDvantage-32 PLUS ● AC to DC Power Converter
7-27
7.5 REPLACING DRIVE SUB-ASSEMBLY (550 ADC)
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W A R N I N G
HAZARDOUS VOLTAGES WHICH CAN CAUSE SEVERE
INJURY OR DEATH ARE PRESENT DURING THE
OPERATION OF THIS EQUIPMENT. TURN OFF AND
LOCK OUT ALL SOURCES OF POWER BEFORE
MAKING ANY REPAIRS.
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This procedure covers replacement of the entire DC Drive Controller Base Sub-
Assembly. To replace individual power components, such as thyristors and fuses, see
Section 7.7.
1. Remove power from the unit.
2. Open the front controller housing cover.
3. Refer to Figures 7-1, 7-3, and 7-6. Remove system interconnections from
the microprocessor board, shown in Figure 7-1. Close cover.
4. Open the main drive door.
5. Remove all cables from the bridge interface board (see Figure 7-3).
6. Remove ground wire from the door.
7. Remove the door, with microprocessor board board in the
controller attached, from the base assembly. Set aside for reuse later.
8. Remove the bridge interface, as instructed in paragraph 7.3.4. Set aside
for reuse later.
9. Remove high voltage wiring at L1, L2, L3, A1, and A2.
10. Remove wiring from TB1 and GND.
11. The complete sub-assembly may now be removed and replaced. Use
existing hardware.
12. Reattach wiring to TB1 and GND.
13. Reattach high voltage wiring at L1, L2, L3, A1, and A2.
14. Reinstall the bridge interface from step 8 (see paragraph 7.3.4).
15. Replace the door/controller from step 7.
16. Replace ground wire on door.
17. Attach all seven bridge interface cables and shut door.
18. Open cover and attach system connections to the microprocessor board.
19. Verify all connections.
20. Close cover and reapply power.
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