Rockwell Automation Publication 6000-UM002E-EN-P - April 2018 115
Preventative Maintenance and Component Replacement Chapter 5
8. Using a voltmeter, check the input voltage on the line side of the CB2
circuit breaker.
The input voltage must be 220V AC.
9. Turn on CB2, CB3, CB5, and CB6 circuit breakers to complete the
procedure.
Inspect PLC
1. Verify all input and output terminal connections are secure.
2. Verify all LEDs are working and indicate normal status.
See publication 2080-UM002
for further information for the PLC, or
publication 2080-WD002
for further information regarding the Isolated Serial
Port Plug-in Modules.
Inspect/Replace Control Unit or Control Boards
• Verify that the terminal connections on the bottom of the Control Unit
are secure and are free of dirt, dust, or foreign material. Clean with an anti-
static cloth.
• Verify the fiber optic cables are properly connected to the A/B/C PWM
boards. Verify an appropriate bend radius (if applicable).
• Check all boards for damage and properly working LEDs.
Replace a Control Unit
1. Turn off all the control power, turn off the UPS, and confirm the LV
Control cabinet is unenergized before operation.
2. Disconnect all of the bottom terminals.
ATTENTION: During removal and installation of the UPS, do not omit the UPS
ground wire.
ATTENTION: Always perform Power Lockout procedure before servicing
equipment. Verify with a hot stick or appropriate voltage measuring device that
all circuits are voltage free. Failure to do so may result in severe burns, injury, or
death.
The Control Unit does not have to be removed to replace Control Boards.
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