Scr anode-to-cathode resistance – Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) User Manual
Page 65
Rockwell Automation Publication 7000-IN006B-EN-P - May 2013
61
Commissioning the Drive Chapter 5
Figure 36 - SCR snubber circuit connections
If you find a damaged device or snubber component, follow the detailed
replacement procedure located in the PowerFlex 7000 ‘B’ Frame User Manual’s
“Component Definition and Maintenance” section.
SCR Anode-to-Cathode Resistance
Performing an Anode-to-Cathode resistance test verifies the integrity of the
SCR. Unlike the SGCT, the SCR uses the snubber circuit to power the self-
powered gate driver boards. The resistance measurement taken across each SCR
should be constant; an inconsistent value may indicate a damaged sharing resistor,
self-powered gate driver board or SCR.
Using an ohmmeter, measure the anode-to-cathode resistance across each SCR in
the rectifier bridge, while looking for similar resistance values across each device.
Sharing Resistance
Snubber Resistance
Snubber Capacitor
Testpoint
To Gate
Driver Board
Heatsink
Heatsink
Sharing Resistance
Snubber Resistance
Snubber Capacitor
Testpoint
To Gate
Driver Board
Heatsink
Heatsink
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