Siemens 3AH Series Instructions Manual page 33

Maintenance andT rou b leshooting
8.
Troubleshooti ng
Table
Problem
Circuit breaker fails to close
Symptoms
Closing spring will not automatically
charge
Closing springs charge, but circu it-
breaker does not close
• Close coil, (52SRC) fa ils to
energize. No sound of circuitbreak-
er closing.
• Close coil energizes. Soun d
of circuit breaker closing is hea rd,
but circuit breaker contacts do not
close.
Possible Causes and Remedies
1 . Secondary control circuit is de-
energ ized or control circuit fus-
esare blown. Check and energize
or replace if necessary
2. Secondary d isconnect contacts
A 1 or D 1 6 are not engaging.
Check a n d replace if req uired.
3. Damage to wiring, terminals or
connectors. Check and repair as
necessary.
4. Failure of charging motor (88)
Replace if requ ired.
5. Motor cut-off switch LS21 or LS22
fails to operate. Replace if nee-
essary.
6. Mechanical fa ilure 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
discon nect pin A2. 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 2 1 -22 or 31 -32 or 1 3-14.
Check and replace as req u ired.
5. Failure of close coil (52SRC).
Check and replace as requ ired .
6. Auxiliary switch 52a/b NC con-
tacts 41-42 are open when cir-
cuitbreaker contacts are open.
Checklinkage and switch . Replace
orad just as necessary.
7. Spring charged switch LS9 N O
contacts remains open after
springs are charged. Check a n d
replace as required .
1 . Mechanical failure of operating
mechanism. Check and contact
factory or authorized service shop.
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