Siemens 3AH Instructions Manual - Page 33

Browse online or download pdf Instructions Manual for Control Unit Siemens 3AH. Siemens 3AH 38 pages. Vacuum circuit breaker operator module
Also for Siemens 3AH: Instructions, Installation, Operation, Maintenance (33 pages), Installation Operation & Maintenance (20 pages)

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1. Table of Contents

Maintenance andT rou b leshooting

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.