Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 240)

Commissioning 4-35
7000 “C” Frame 7000L-UM300I-EN-P – Juen 2013
SCR Testing
The following steps outline how to verify SCR semiconductors and
all associated snubber components. A quick reference to the
expected resistance and capacitance values as well as a simple
schematic diagram is located in below:
Table 4.B – SCR Snubber Circuit Resistance and Capacitance Values
Drive Rating Sharing Resistance Snubber Resistance Snubber Capacitance
3300 to 6600V 80 kΩ 90 Ω 0.5 µf
Anode
Chillblock
Cathode
Chilblock
Disconnect Points
Rsh-2
Rsh-1
Rsn-1
Cs-1
Cs-2
Rsn-2
To Gate Driver Board
TP
Figure 4.7 – SCR Snubber Circuit Connections
If a device or snubber component is found to be damaged, a detailed
replacement procedure is a located in Chapter 6 – Component
Definition and Maintenance.