Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 48)

48 Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
6. Install the new capacitor, sliding it back until it fits into the slot. Fasten the
front bracket.
7. 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. You may want to fasten these
connections before fully sliding the capacitor into place depending on the
available space.
8. Follow the instruction labels on each capacitor to tighten the terminal
connections.
9. Reinstall the removed sheet metal, and complete one final check to ensure
connections are secure and correct.
Testing Filter Capacitors
There are two ways to test line filter capacitors. Rockwell Automation
recommends the first method as it reduces the chance of re-torque issues because
the capacitors are not disconnected. If the readings are unsatisfactory, the second
method is more accurate, but involves disconnecting and testing them
individually.
First Method
1. Ensure there is no power to the equipment.
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.
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.
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. 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 running due to process. A freewheeling
motor can generate voltage that feeds back to the equipment.