Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 73)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 73
Component Definition and Maintenance Chapter 3
Snubber Resistance
Access to the snubber resistor is not required to test its resistance. Located
within the PowerCage under the heatsink is a snubber circuit test point. 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 58 - Testing the Snubber Resistor
Figure 59 - 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