Maintenance and Troubleshooting
1. Secondary control circuit is de-
energized or control circuit fuses
are blown. Check and energize
or replace if necessary
2. Secondary disconnect contacts
15 or 16 are not engaging. Check
and replace if required.
3. Damage to wiring, terminals or
connectors. Check and repair as
necessary.
4. Failure of charging motor (88)
Replace if required.
5. Motor cut-off switch LS21 or LS22
fails to operate. Replace if nec-
essary.
6. Mechanical failure of operating
mechanism. Refer to factory or
authorized service shop.
1. Secondary control circuit de-en-
ergized or control circuit fuses
blown. Correct as indicated.
2. No closing signal to secondary
disconnect pin 13. Check for con-
tinuity and correct relay logic.
3. Secondary disconnect contacts
13 or 15 are not engaging. Check
and correct as required.
4. Failure of anti-pump relay (52Y)
contacts 21-22 or 31-32 or 13-14.
Check and replace as required.
5. Failure of close coil (solenoid)
(52SRC). Check and replace as
required.
6. Auxiliary switch NC contacts 41-
42 are open when breaker con-
tacts are open. Check linkage and
switch. Replace or adjust as nec-
essary.
7. Spring charged switch LS9 NO
contacts remains open after
springs are charged. Check and
replace as required.
1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service
shop.
Breaker fails to close
Closing springs will not
automatically charge
Possible Causes and Remedies
Problem
Symptoms
Table 8. Troubleshooting
Closing springs charge, but
breaker does not close
• Closing coil, or solenoid
(52SRC) fails to energize.
No sound of breaker closing.
• Closing coil energizes. Sound
of breaker closing is heard,
but breaker contacts do not
close.
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