Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 113)

Rockwell Automation Publication 7760-UM001D-EN-P - October 2014 113
Troubleshooting Chapter 8
If the values for each leg vary by more than 1%, the voltage sensing module may
need to be replaced. See Renewal Parts listing in Appendix C, and refer to
Voltage-Sensing Board Replacement on page 103 .
Note: The white high voltage wires must be connected to the correct tap on each
leg of the voltage sensing module. Failure to do so may result in equipment
damage. Special care must be taken when working with the white high voltage
wire to ensure it is not damaged.
The ribbon cable must be connected to J1 on the voltage sensing board or the
equipment will not function.
2. When repairs are complete, re-assemble all parts, check all fasteners, and
verify all connections are correct and tight. Make sure all barriers and
mechanical parts are in place and secured.
3. Repeat PowerBrick (SCR) Testing on page 108 and Resistance Checks and
Power Supply Tests on page 53 .
Power Resistor Replacement When replacing the ceramic wire-wound type resistors, use caution when
handling the parts. The resistor element is under a thin coating on the ceramic
tube, and it may be damaged if dropped, struck or scraped.
ATTENTION: Grounds must be reconnected on the voltage sensing boards.
Failure to do so may result in injury, death or damage to equipment.
ATTENTION: Make sure ground wires from the Voltage Sensing Module are
securely connected to the ground bar in the low voltage panel or ground bus.
Failure to do so may result in severe injury or equipment damage.