Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 79)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 79
Component Definition and Maintenance Chapter 3
Figure 72 - Snubber Circuit Assembly for SCR Rectifier Module
SCR Testing
The following procedure verifies SCR semiconductors and all associated snubber
components. For quick reference to the expected resistance and capacitance
values, refer to
Table 2 below. A simple schematic diagram in Figure 73 shows the
snubber component connections across an SGCT.
Table 2 - SCR Snubber Circuit Resistance and Capacitance Values
Cathode
Cs-2
Cs-1
Rsh
Rsn-2
Rsn-1
Anode
SCR Rating Sharing Resistance Snubber Resistance Snubber Capacitance
350, 400, 815 A 80 k Ω 60 Ω 0.5 μf