Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 109)

Rockwell Automation Publication 7760-UM001D-EN-P - October 2014 109
Troubleshooting Chapter 8
If the power pole resistance is a multiple of 25 k lower than specified above, there
may be one or more shorted SCRs in the PowerBricks.
3. If a short circuit is suspected, the power pole cart must be removed from
the equipment to facilitate further testing. Refer to cart removal
instructions in the Installation Instructions Manual (publication
7760-IN001_-EN-P ).
4. Remove the clear plastic guards from the front and rear of the power pole
assembly by removing two screws from the top and bottom of each guard.
5. Measure DC resistances as follows for each PowerBrick: (Refer to
Figure 46 ).
C1 to C2: 21…29 k
Gate to Cathode (G/C): 4…40
Figure 46 - PowerBrick Current Loop Gate Driver Board Connections
6. If the resistance values are out of range, the PowerBrick must be removed
from the power pole cart assembly. Refer to PowerBrick removal procedure
in the Installation Manual (publication
7760-IN001_-EN-P ).
CT
J1
Therm
Rx1 Tx1
CT
J2
Rx2 Tx2
Connection to H3
Snubber Capacitor
Connection
Connection to H2
Snubber Resistor
Connection
Current Loop
CT Connector
Test Power Supply
Connector Gate Logic Fibre Optic Receiver
Temperature Feedback Fibre Optic Transmitter
Thermistor Connector (J2)
Match Band Character
SCR Gate Lead
Connectors (J5)
Overvoltage Sense Connection