40 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Chapter 2 Power Component Definition and Maintenance
The surge arrester is certified as per ANSI/IEEE Std C62.11-1993. Certification
tests include high current short duration tests, low current long duration tests,
and fault current withstand tests. The fault current withstand tests consist of
different combinations of kA and number of cycles, including a 20kA 10-cycle
test, under which the arresters are non-fragmenting without expelling any
internal components.
When the incoming energy exceeds the handling capability of the arrester and
causes arrester failure, the housing splits open to vent without causing
damage to any adjacent components.
Replacing the Surge Arrester
1. Isolate and lock out all power to the drive.
To access the surge arrestors in an arc resistant drive, remove the
barriers behind the swing-out LV compartment.
2. Wait a minimum of ten minutes for the drive to discharge stored energy.
3. Observe the location of the connecting leads.
4. Use proper method to ensure the leads are at ground potential. Use
temporary grounding 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. Torque the surge arrester hardware to 28 N•m (21 lb•ft).
Figure 32 - Surge Arresters (Heatsink Model)
ATTENTION: To prevent electrical shock, disconnect the main power
before working on the drive. 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.
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