Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 51)

Rockwell Automation Publication 7000-IN012B-EN-P - June 2014 51
Commissioning the Drive Chapter 4
Silicon Controlled Rectifier
PowerCages Figure 36 shows the snubber circuit. Figure 37 shows the physical locations of the
same circuit.
Disconnect the 2-pole plug to the Gate Driver board marked TB1 on the circuit
board. Measure the resistance from the point of the plug that connects to the
point labeled V.SENSE on the Gate Driver board to the anode side heat sink. A
value of 80 kΩ indicates a good sharing resistor.
Figure 36 - Snubber Circuit for SCR Rectifier Module
T P
R s n-2
C s -1
R s h
A node
C s -2
S P G D B
Cathode
R s n-1