Siemens SGIM-3268H Manual page 48

Overhaul
Troubleshooting (continued)
P P r r o o b b l l e e m m
Nuisance or false close
Circuit breaker will not trip
Nuisance or false trip
46
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S S y y m m p p t t o o m m s s
Electrical problem
Mechanical problem
Tripping coil, or solenoid (52T) does
not energize. There is no tripping
sound.
Tripping coil (52T) energizes. No trip-
ping sound is heard, and breaker
contacts do not open (i.e., they remain
closed).
Tripping coil (52T) energizes. Tripping
sound is heard, but breaker contacts
do not open.
Electrical problem
Mechanical problem
P P o o s s s s i i b b l l e e C C a a u u s s e e s s a a n n d d R R e e m m e e d d i i e e s s
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.
1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service
shop.
1. Secondary control power is de-
energized or control power fuses
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.
1. Failure of tripping spring or its
mechanical linkage. Check and
replace if required.
1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service shop.
2. One or more of the vacuum inter-
rupters are held closed. Check
and replace as necessary.
1. Tripping signal remains energized
on secondary disconnect contact 1.
Check for improper relay logic.
1. Mechanical failure of operating
mechanism. Check and contact
factory or authorized service shop.