Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 99)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 99
Component Definition and Maintenance Chapter 3
Replacing Filter Capacitors
See Publication 7000-IN010_-EN-P , “Handling, Inspection, and Storage of
Medium Voltage Line Filter Capacitors”.
1. Isolate and lock out all power to the drive.
2. Remove medium voltage barrier below the low voltage panel to access
capacitor (
Figure 80 ).
3. Short all four bushings together and to ground on both capacitors before
handling the connections. Note the location of all the cables and mark
them accordingly.
4. Remove the four power connections to the terminals, and the single
ground connector from the drive to the capacitor frame.
5. Remove the grounding network and top bracket that holds the capacitor
in place. At the bottom of the capacitor, there is no hardware securing the
capacitor; it fits into a slot in the assembly.
6. Remove the capacitor from the drive. The capacitors can weigh up to
100 kg (200 lb); two people may be required to remove them.
7. Install the new capacitor, sliding it back until it fits into the slot. Fasten the
top bracket and grounding network.
8. Reconnect all the power cables and the ground connection. These use
M14 hardware, but should only be tightened to 30 N•m (22 lb•ft) due to
capacitor mechanical constraints.
9. Remove any shorting/grounding conductors.
10. Reinstall the sheet metal that was removed, and complete one final check
to ensure connections are secure and correct.
ATTENTION: 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.
ATTENTION: Verify the load is not turning due to the process. A freewheeling
motor can generate voltage that will be back-fed to the equipment being
worked on.
IMPORTANT Do not lift capacitor by bushings. Doing so may damage bushings and result in
oil leakage.
ATTENTION: The porcelain bushings are extremely fragile and any force applied
to the bushings can damage the seal between the bushing and the body
causing potential leaks or chipping.