Rockwell Automation 7000L PowerFlex 7000 Medium Voltage AC Drive C Frame - Marine - Manual (Page 187)

Component Definition and Maintenance 4-11
7000 ―C‖ Frame - Marine 7000L-UM302B-EN-P – June 2013
Surge Arrester Replacement
1. Ensure there is no power to the equipment. Isolate the drive by lock
out / tag out.
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 surge
arrester. 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.
2. Wait for a minimum of 10 minutes to allow the stored energy in the
drive to be discharged.
3. Observe the location of the connecting leads.
4. Using proper method to ensure the leads are at ground potential. Use
temporary ground when necessary.
5. Detach the connecting leads.
6. Loosen the bolt that attaches the surge arrester to the ground bus.
Remove the arrester. Remove temporary ground when applicable.
7. Replace the surge arrester with an equivalent one (make sure that the
voltage rating is the same).
8. Connect the leads to the surge arrester.
9. Surge arrester hardware to be torqued to 28 Nm (21ft/lbs).
Surge Arresters
Figure 4.7 – Surge Arresters