Allen-Bradley PowerFlex 7000 User Manual

Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 61
Power Component Definition and Maintenance Chapter 2
SGCT and Snubber Circuit
With all power semiconductors or thyristors, the SGCT requires a snubber
circuit. The snubber circuit for the SGCT consists of a snubber resistor in
series with a snubber capacitor.
Figure 43
shows the snubber circuit. Figure 53 shows the physical locations of
the same circuit. Measure the resistance across two adjacent heatsinks. A value
between 60 kΩ and 75 kΩ indicates a good sharing resistor.
Figure 43 - Snubber Circuit for SGCT Module
Figure 44 - Snubber Circuit for SGCT module (with SPS board)
Rsn-2
Rsn-1
Anode
Cs-1
Rsh
Cs-2
Snubber
Resistor
Test
Cathode
Heatsink Heatsink
Rsn-2
Rsn-1
Anode
Cs-1
Rsh
Cs-2
Snubber
Resistor
Test
Cathode
Heatsink Heatsink
SPS Board
J1-1
J1-2

Allen-Bradley PowerFlex 7000 Specifications

General

Brand	Allen-Bradley
Model	PowerFlex 7000
Category	Controller
Language	English