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Types SDV-R and SDV-R-AR distribution circuit breakers |
Instruction manual
Introduction
The following procedures along with the troubleshooting charts at the end of this section, provide maintenance personnel with a
guide to identifying and correcting possible malfunctions of the type SDV-R distribution circuit breaker.
Problem
Symptoms
Possible causes and remedies
Circuit breaker fails to close.
Closing spring will not automatically charge.
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).
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) 333-7421 or
+1 (423) 262-5700 outside the
U.S.
Closing springs charge but circuit
breaker does not close.
Closing coil or solenoid (52SRC) fails
to energize. No sound of circuit
breaker closing.
1. Secondary control circuit de-
energized or control circuit fuses
blown. Correct as indicated.
2. No closing signal to multi-pin
plug pin A2 or contacts A2 and
B3 are not engaging. Check for
continuity and correct protective
relay logic. Replace contacts if
required.
3. Failure of anti-pump relay (52Y)
contacts 21 to 22, 31 to 32 or
13 to 14. Check and replace as
required.
4. Failure of close coil (solenoid)
(52SRC). Check and replace as
required.
5. Auxiliary switch NC contacts 41
to 42 are open when circuit
breaker contacts are open.
Check linkage and switch.
Replace or adjust as necessary.
Troubleshooting
Table 5: Troubleshooting
