Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control User Manual

Page 357

Component Definition and Maintenance 6-53

7000 “A” Frame

7000A-UM150F-EN-P –June 2013

Filter Capacitor Replacement

1. Ensure there is no power to the equipment.

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.

A T T E N T I O N

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.

2. Remove medium voltage barrier below the low voltage panel to

access capacitor. (See Figure 6.41).

3. Short all four bushings together and to ground on both capacitors

before handling the connections.

4. Note the location of all the cables and mark them accordingly.

5. Remove the 4 power connections to the terminals, and the single

ground connector from the drive to the capacitor frame.

6. 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.

7. Remove the capacitor from the drive. THESE CAPACITORS CAN

WEIGH AS MUCH AS 100 kg (200 lbs), SO YOU WILL REQUIRE
TWO PEOPLE TO REMOVE A CAPACITOR.

I M P O R T A N T

Do not lift capacitor by bushings. Doing so
may damage bushings and result in oil
leakage.

8. Install the new capacitor, sliding it back until it fits into the slot.

Fasten the top bracket and grounding network.

9. Reconnect all the power cables and the ground connection. These use

M14 hardware, but should only be tightened to 30 Nm (22 ft-lbs.) due
to capacitor mechanical constraints.

10. Remove any shorting/grounding conductors.

11. Reinstall the sheet metal that was removed, and complete one final

check to ensure connections are secure and correct.