Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 362)

6-18 Component Definition and Maintenance
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Testing Filter Capacitors
1. Ensure there is no power to the equipment before testing the
capacitor.
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 running due to process. A
freewheeling motor can generate voltage that will
be back-fed to the equipment being worked on.
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.
A T T E N T I O N A T T E N T I O N Ve 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 or other
voltage-measuring device verify that the
capacitor is fully discharged before touching it.