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Sgct powercages – Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) User Manual

Page 74

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74

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013

Chapter 3 Component Definition and Maintenance

SGCT PowerCages

Figure 52

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 52 - Snubber Circuit for SGCT module

Figure 53 - Snubber Circuit Assembly for SGCT module

Cs-1

Rsn-2

Cs-2

e

Rsh

Rsn-1

Cathode

Snubber Resistor Test

Cs-1

Cs-2

Anode

Rsn-1

Rsh

Rsn-2

Cathode