Test 3
1. Open the recloser contacts.
2. Ground the recloser.
3. Connect and ground terminals 1, 3, and 5 (see Figure 10).
4. Connect terminals 2, 4, and 6.
5. Apply proper test voltage to terminals 2, 4, and 6.
6. The recloser should withstand the test voltage for 60
seconds.
7. Reverse the connections: ground terminals 2, 4, and 6.
8. Apply test voltage to terminals 1, 3, and 5 for 60 sec-
onds.
9. The recloser should withstand the test voltage for 60
seconds.
Withstand Test Results
The high-potential withstand tests provide information on
the dielectric condition of the recloser and the vacuum integ-
rity of the interrupters.
If the recloser passes the closed-contacts tests (Tests 1
and 2), but fails the open-contacts test (Test 3), the cause
is likely to be in the interrupter assembly. Retest each phase
individually to determine the failed phase or phases.
If a recloser fails the closed-contacts test, the cause is likely
to be a diminished electrical clearance or failed insulation.
If the recloser does not pass Tests 1, 2, or 3, contact an
authorized service center or your Cooper Power Systems
representative.
Note: Test results for NOVA reclosers equipped with the
internal voltage sensing option will be influenced by the
source-to-ground connected sensing resistor, especially
if DC high-potential testing is performed.
Module Flashover Service
If a NOVA recloser module was exposed to an external
flashover, an inspection process is recommended to assure
proper operation of the recloser. Should the NOVA recloser
exhibit external flashover attributes (carbon tracking or dis-
coloration), 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 the
High-Potential Withstand Testing section of this
manual.
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 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” 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 Cooper Power
Systems representative.
6. Inspect the operating rod for damage. If there is
damage to the operating rod, the module must be
replaced. Contact an authorized service center or your
Cooper Power Systems representative.
7. If no damage is found, clean the module with isopro-
pyl 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 per-
forming a high-potential withstand test. Refer to the
High-Potential Withstand Testing section of this
manual.
TROUBLESHOOTING
If the Type NOVA recloser does not perform as described
in the OPERATION section of this manual, the following
information may assist in troubleshooting:
Unit Will Not Close
•Make sure the yellow manual open handle is com-
pletely up.
• Check all cables for proper connection.
• Verify that the control has power.
• Upon loss of AC power, check recloser control battery
level.
• For NOVA reclosers with the auxiliary-powered inter-
face, verify that auxiliary power is present at recloser.
• For NOVA reclosers with the control-powered inter-
face, check the fusing on the DC-to-DC converter
board located in the control cabinet.
Unit Will Not Open Electrically
• Check all cables for proper connection.
• Verify that the control has power.
• For NOVA reclosers with the auxiliary-powered inter-
face, verify that auxiliary power is present at recloser.
• For NOVA reclosers with the control-powered inter-
face, check the fusing on the DC-to-DC converter
board located in the control cabinet.
S280-42-1
25
!
SAFETY
NOW
!
SAFETY
FIRST
!
SAFETY
FOR YOUR SAKE
!
SAFETY
MAKES SENSE
!
SAFETY
USE IT
!
SAFETY
FOR LIFE
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