Siemens 3AH3 Instruction Manual page 48

Table 8: Troubleshooting
Problem
Circuit breaker fails to close.
Nuisance or false close
48
Symptoms
Closing spring will not automatically charge.
Closing coil or solenoid
(52SRC) fails to energize.
No sound of circuit
Closing springs charge
but circuit breaker does
not close.
Closing coil energizes.
Sound of circuit breaker
closing is heard, but
circuit breaker contacts
Electrical problem
Mechanical problem
1. Secondary control circuit is de-energized or control
circuit fuses are blown. Check and energize or replace
if necessary.
2. Secondary multi-pin plug contacts A1 or D16 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 (88.0). Replace if required.
5. Motor cut-off switch LS21 or LS22 fails to operate.
Replace if necessary.
6. Mechanical failure of operating mechanism. Check
and contact the factory or Siemens field service at
1-800-347-6659 or 1-919-365-2200 outside the U.S.
1. Secondary control circuit de-energized or control
circuit fuses blown. Correct as indicated.
2. No closing signal to secondary disconnect pin A2.
Check for continuity and correct protective 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 to 22, 31
breaker closing.
to 32 or 13 to 14. Check and replace as required.
5. Failure of close coil (solenoid) (52SRC). Check and
replace as required.
6. Auxiliary switch NC contacts 41 to 42 are open when
circuit breaker contacts are open. Check linkage and
switch. Replace or adjust as necessary.
1. Mechanical failure of operating mechanism. Check
and contact the factory or Siemens field service at
1-800-347-6659 or 1-919-365-2200 outside the U.S.
do not close.
1. Nuisance or false closing signal to secondary
disconnect multi-pin plug contact. Check protective
relay logic. Correct as required.
2. Closing coil (52SRC) terminal A2 is shorted-to-
ground. Check to determine if problems are in wiring
or coil. Correct as required.
1. Mechanical failure of operating mechanism. Check
and contact the factory or Siemens field service at
1-800-347-6659 or 1-919-365-2200 outside the U.S.
Possible causes and remedies