Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 343)

Component Definition and Maintenance 6-39
7000 “A” Frame 7000A-UM150F-EN-P –June 2013
SCR PowerCages
The snubber circuit is shown in Figure 6. 31 . Disconnect the 2-pole plug
to the Gate Driver Board that is 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 heatsink. A value
of 80 kΩ indicates a good sharing resistor.
Rsn-2
Rsh
Rsn-1
Anode
To gate driver board
Cs-2
Cathode
Cs-1
TP
Rsn-2
Rsh
Rsn-1
Anode
To gate driver board
Cs-2
Cathode
Cs-1
TP
Figure 6.31 – Snubber circuit for SCR rectifier module
Rsh
Rsn-1
Cs-1
Cs-2
Anode
Cathode
Rsn-2
TP
To gate driver board
Figure 6.32 – Snubber circuit Assembly for SCR rectifier module