Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control (PanelView 550) - Manual (Page 150)

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Component Definition and Maintenance
7000A-UM151D-EN-P – March 2013 7000 “A” Frame
2. Follow appropriate safety steps to isolate the equipment from medium
voltage.
3. Verify that there is no voltage present on the capacitor by using a hot
stick or any other appropriate voltage-measuring device.
4. Perform visual inspection to ensure there is no oil leak or bulge in any
of the capacitors.
5. Using a DMM measure the capacitance across each phase-to-neutral
of capacitors without removing any connections. If the difference
between the highest and the lowest readings is below 15% then all
capacitors are in good condition.
6. If the difference between the highest and the lowest readings is off by
15% or more, then you might have a bad capacitor.
7. Before disconnecting the capacitors, note the location of all the cables
and mark them accordingly.
8. Disconnect power cables/bus bars from the capacitor terminals on all
four bushings and isolate them from the capacitor. (Refer to “Filter
Capacitor Replacement” guidelines in the Classic User Manual -
Component Definition and Maintenance chapter (chapter 6) for using
proper torque when reconnecting the capacitors)
Second Method
1. Ensure there is no power to the equipment before testing the
capacitor.
A T T E N T I O N A T T E N T I O N To prevent electrical shock ensure the main
power has been disconnected before working on
the capacitor. Verify that all circuits are voltage
free using a hot stick or appropriate voltage-
measuring device. Failure to do so may result in
injury or death.
D.C. Link / Fan / Control
Components (cont.)