Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 74)

74 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Snubber Capacitance
Turn the multimeter from the resistance to capacitance measurement mode.
Verify the snubber capacitor by measuring from the test point to the heat sink
adjacent to the right for standard rectifiers, or from heat sink to heat sink. For
SPS rectifiers, measure from the test point to pin 1 of the Phoenix connector that
plugs into J1 of the SPS board (disconnect the J1 connector from the SPS board
first).
Figure 60 - Snubber Capacitor Test
Figure 61 - Snubber Capacitor Test (shown with SPS Board installed)
Heatsink Heatsink
Snubber
Resistor Snubber
Capacitor
Sharing Resistor
Test Point
Measure capacitance
between heat sink and
test point (or heat sink
to heat sink)
Snubber test point
SGCT
Heatsink Heatsink
Snubber
Resistor Snubber
Capacitor
Sharing Resistor
J1
SPS Board
1 2
SGCT
Test Point
Snubber Capacitor Wire
Use Connector Terminal Screw
for Testing Snubber Capacitor
SGCT Cathode Wire
Snubber
Test
Point