Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 285)

Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014 285
Component Definition and Maintenance Chapter 5
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 Nm (22 ft-lb.) 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. There are instruction labels on each capacitor detailing how to tighten the
terminal connections. Please refer to these labels.
9. Reinstall the sheet metal that was removed, and complete one final check
to ensure connections are secure and correct.
Testing Filter Capacitors
1. Ensure there is no power to the equipment before testing the capacitor.
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. Note the location of all the cables and mark them accordingly.
6. Disconnect power cables from the capacitor terminals on all four bushings
and isolate them from the capacitor.
7. Connect a low voltage single-phase test power, for instance 110V or 220V,
across a phase and the neutral of the capacitor. Switch on the test power
and measure the test voltage and current drawn by the capacitor. Repeat
the test for all three phases and note down the test voltage and current.
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 running due to process. A
freewheeling motor can generate voltage that will be back-fed to the
equipment being worked on.
ATTENTION: The capacitor will charge during this test so care must be
taken to prevent a shock or injury. When moving the test connections
from one phase to the next, wait for at least five minutes until the
capacitor is discharged. Using a hot stick.