Filter capacitor replacement – Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) User Manual
Page 283
Component Definition and Maintenance 5-41
7000 “A” Frame
7000A-RM001A-EN-P – January 2011
Filter Capacitor Replacement
1.
Ensure there is no power to the equipment.
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.
A T T E N T I O N
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 5.30).
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 (220 lbs), SO YOU WILL REQUIRE
TWO PEOPLE TO REMOVE A CAPACITOR.
I M P O R T A N T
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.