Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 48)

48 Rockwell Automation Publication 7000-IN012B-EN-P - June 2014
Chapter 4 Commissioning the Drive
Snubber Resistance (SGCT Device)
Access to the snubber resistor is not required to test the resistance. The snubber
circuit test point is located within the PowerCage under the heat sinks. For each
device, there is one test point. To verify the resistance, measure the resistance
between the test point and the heat sink above.
Figure 32 - Snubber resistor test
Figure 33 - Snubber Resistor Test (with SPS Board)
Snubber test point
Measure resistance
between heat sink
and test point
Heatsink Heatsink
SGCT
Snubber
Resistor Snubber
Capacitor
Sharing Resistor
Test Point
Resistance value between
heat sink and test point is
Snubber Resistance
Heatsink Heatsink
Snubber
Resistor Snubber
Capacitor
Sharing Resistor
J1
SPS Board
1 2
SGCT
Test Point
Resistance Value between two
heat sinks is sharing resistance
in parallel with Anode-Cathode
Resistance