45
Overhaul
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Breaker fails to close
Closing springs will not automatically
1. Secondary control circuit is de-
charge
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).
Check brushes and replace if
required.
5. Motor cut-off switch (LS1) failed to
operate. Replace if necessary.
6. Mechanical failure of operating
mechanism. Refer to factory or
authorized service shop.
Closing springs charge, but breaker
does not close
• Closing coil, or solenoid (52SRC)
1. Secondary control circuit de-
fails to energize. No sound of
energized, or control circuit fuses
breaker closing
blown. Correct as indicated.
2. No closing signal to secondary
disconnect pin 13. Check for
continuity 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 3-4
are open when breaker contacts
are open. Check linkage and
switch. Replace or adjust as
necessary.
7. Spring charged switch (LS2) NO
contact remains open after
springs are charged. Check and
replace as required.
• Closing coil energizes. Sound of
1. Mechanical failure of operating
breaker closing is heard, but
mechanism. Check and contact
breaker contacts do not close.
factory or authorized service shop.
Troubleshooting
