Siemens 3AH Інструкція з експлуатації - Сторінка 34

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1. Table of Contents

Maintenance andTroubleshooting

(continued)

Trou bleshooti ng

Table

Problem

N uisance or false close

Circuit breaker will n ot trip

N uisance or false trip

Symptoms

Electrical problem

M echa n ical Problem

Trip coil, (52T) does not energize:

There is no tripping sound.

Trip coil (52T) energizes. No tripping

sound is heard, a n d circuit breaker

contacts do not open (i.e .. , they re-

main closed).

Trip coil (52T) energ izes. Tripping

sou nd is heard, but circu itbreaker

contacts do not open.

Electrical problem

Mech a n ical problem

Possible Causes and Remedies

1. N u isance or false closing signal

to secondary discon nect contact

A2. Check relay logic. Correct as

req u ired.

2 . Close coil (52SRC) terminal A2 is

shorted to g round. Check to deter-

mine if problems in wiring or coil.

Correct as required.

1. Mech a n ical failure of operating

mech a n ism. Check and contact

factory or a uthorized service shop.

1. Second a ry control power is de-

energized or control power fus-

esare blown. Correct as indicated.

2. Damage to wiring, terminals or

con nectors. Check and repair as

necessary.

3. N o tripping signal to secondary

disconnect contact C2. Check for-

contin uity a n d correct relay logic.

4. Secondary d isconnect contacts

C2 or 02 a re not enga g i n g . Check-

a n d replace if req u ired .

5. Fai l u re of trip coil (52T). Check

and replace if necessa ry.

6. Auxiliary switch 52a/b N O contacts

23-24 or 33-34 are open when cir-

c u it breaker is closed.

Check l i n kage and switch. Replace

or adjust as necessa ry.

1. Fai l u re of opening spring or its

mechanical l inkage. Check a nd

replace if required .

1. Mech a n ical failure of operating

mechan ism . Check a n d contact

factory or a uthorized service

shop.

2. One or more of the vacuum in-

terrupters a re held closed. Check

and replace as necessary.

1.Tripping signal remains energized

on secondary disconnect contact

C2. Check for improper relay logic.

1. Mech a n ical failure of operating

mech anism. Check and contact

factory or authorized service shop.