Installation Manual

Troubleshooting 8-89
Servo Power Verification
1. On the XY Servo Interface PWA, locate the J3 connector.
2. Confirm there are two blue wires attached to the J3 connector labeled SERVO DC POWER (the
positions of these wires are labeled +SERVO).
3. Measure VDC at the connector where the two blue wires come into J3. (Use TP1 labeled
SERVO_RETURN on the XY Servo Interface PWA for ground.).
4. Is the reading 67.5 ±2 VDC for each blue wire?
Go to Step 5
XY Servo Interface PWA (P/N 60-1211-00) has failed. See Parts
Replacement
section.
5. Exit FmNT, shut down Windows NT, press the black OFF (0) button on the Operator’s Console,
switch Main Circuit Breaker to
OFF (0) position, and disconnect Power Cable from the facility outlet.
6. Locate the Servo Transformer on the Servo Shelf.
7. Disconnect the Power Cord (P/N 56-0304) from the Servo Transformer AC power inlet.
8. Test the two 8-Amp fuses in the Fuse Tray on the Servo Transformer AC Power Inlet for continuity
(the outward fuse is a spare, the inward fuse is connected to the circuit).
9. Is there continuity on both fuses?
Replace fuse (P/N 55-5392). See Parts
Replacement
section. Then go to Step 10.
Go to Step 14
10. Reconnect the Power Cord (P/N 56-0304) to the Servo Transformer’s AC power inlet.
11. Connect the Power Cable to the facility outlet, switch Main Circuit Breaker to
ON (I) position, press
the green
ON (I) button on the Operator’s Console, and enter FmNT.
12. Is the green +SERVO power LED illuminated?
Go to Step 13
Go to Servo Amplifier Verification in this subsection.
13. Exit FmNT, shut down Windows NT, press the black OFF (0) button on the Operator’s Console,
switch Main Circuit Breaker to
OFF (0) position, and disconnect Power Cable from the facility outlet.
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