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Module flashover service
If a NOVA NX-STS recloser module was exposed to an
external flashover, an inspection process is recommended
to ensure proper operation of the recloser. Should the
NOVA NX-STS recloser exhibit external flashover attributes
(carbon tracking or discoloration), the following procedure
is recommended:
1. Bypass and remove the recloser from service as
described in this manual.
2. Confirm the dielectric strength of the recloser by
performing high-potential withstand test. Refer to
High-Potential Withstand Tests section on page 17 .
3. Inspect the housing and lifting lugs for damage that may
affect electrical and/or mechanical performance. If there
is damage to either the housing or lifting lugs, then they
must be replaced or repaired.
4. Inspect module for damage to the terminals. Remove
any damaged terminals and replace.
5. Inspect module for damage to the module conductor
rods (0.63-inch diameter threaded rods on top and side
of module for affixing terminals). If there is damage
to the module rods, the module must be replaced.
Contact an authorized service center or your Eaton
representative.
6. Inspect the operating rod for damage. Check the module
surface and major and minor sheds for cracks, holes,
and major chips. If damage is present, the module must
be replaced. Contact your Eaton representative.
7. If no damage is found, clean the module with isopropyl
alcohol and a scratch-free, nylon scouring pad to remove
any carbon deposit.
8. Before returning to service, confirm electrical operation
by opening and closing the recloser with a control.
Confirm the dielectric strength of the recloser by
performing a high-potential withstand test. Refer to
High-Potential Withstand Tests section on page 17 .
INSTALLATION AND OPERATION INSTRUCTIONS MN280103EN March 2023 www.eaton.com
Troubleshooting
If the NOVA NX-STS recloser does not perform as described
in the Recloser Operation section on page 10, the
following information may assist in troubleshooting.
Unit will not close
Make sure the yellow manual operating handle is
•
completely up (returned to the CLOSED position)
Check all cables for proper connection
•
Check the condition of the battery located in the control
•
cabinet. Refer to Service Information MN280095EN
Form 7 Microprocessor Based Pole Mount Recloser
Control Installation and Operation Instructions for the
battery testing procedure
Unit will not open
Check all cables for proper connection
•
Check the condition of the battery located in the control
•
cabinet. Refer to Service Information MN280095EN
Form 7 Microprocessor Based Pole Mount Recloser
Control Installation and Operation Instructions for the
battery testing procedure
Service information
19
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