46
Overhaul
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Nuisance or false close Electrical problem 1. Nuisance or false closing signal
to secondary disconnect contact
13. Check relay logic. Correct as
required.
2. Closing coil (52SRC) terminal 2
is shorted to ground. Check to
determine if problem is in wiring
or coil. Correct as required.
Mechanical problem 1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service
shop.
Circuit breaker will not trip Tripping coil, or solenoid (52T) does 1. Secondary control power is de-
not energize. There is no tripping energized or control power fuses
sound. are blown. Correct as indicated.
2. Damage to wiring, terminals or
connectors. Check and repair as
necessary.
3. No tripping signal to secondary
disconnect contact 1. Check for
continuity and correct relay logic.
4. Secondary disconnect contacts
1 or 2 are not engaging. Check
and replace if required.
5. Failure to trip coil (52T). Check
and replace if necessary.
6. Auxiliary switch NO contacts 1-2
or 5-6 are open when breaker is
closed. Check linkage and
switch. Replace or adjust as
necessary.
Tripping coil (52T) energizes. No trip- 1. Failure of tripping spring or its
ping sound is heard, and breaker mechanical linkage. Check and
contacts do not open (i.e., they remain replace if required.
closed).
Tripping coil (52T) energizes. Tripping 1. Mechanical failure of operating
sound is heard, but breaker contacts mechanism. Check and contact
do not open. factory or authorized service shop.
2. One or more of the vacuum inter-
rupters are held closed. Check
and replace as necessary.
Nuisance or false trip Electrical problem 1. Tripping signal remains energized
on secondary disconnect contact 1.
Check for improper relay logic.
Mechanical problem 1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service shop.
Troubleshooting (continued)
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