Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 358)

6-54 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” 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 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.