Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 254)

5-12
Component Definition and Maintenance
7000A-RM001A-EN-P – January 2011 7000 “A” Frame
Surge Arresters (cont.)
Surge Arresters
Figure 5.10 – Surge Arresters
Note: When the surge arrester is disconnected from MV, it is possible
that a small amount of static charge is retained by the arrester. As a
precautionary measure, install a temporary ground on the line-end of the
arrester and discharge the stored energy. Remove temporary ground
before the arrester is reinstalled. To avoid electrical shock when removing
the arrester from service, consider it to be fully energized until both the
line and ground leads are disconnected.
Field Test and Care
No field testing is necessary. The arresters do not require special care.
However at very dusty sites, it is suggested to clean the arrester when the
whole drive is cleaned.