Troubleshooting - Siemens 3AF 01 Operating Instructions Manual

8.13

Troubleshooting

Problem Symptoms / Effect
Breaker 1. Closing spring charges,
fails to but breaker does not
close. close.
2. Closing spring does not
charge automatically.
3. Closing release operates,
sound of breaker closing
is heard, but breaker
contacts do not close.
Nuisance 1. Electrical problem
or false
closing of
breaker
2. Mechanical problem
Breaker 1. Tripping Release (Y1)
does does not trip.
not trip.
2. There is no tripping
sound.
Nuisance 1. Electrical problem
or false
tripping of
2. Mechanical problem
breaker
18
Possible Causes / Reasons
1. Electrical power to auxiliary
circuit is off, or MCB has tripped.
2. Loose connection,
damage to wiring.
3. No closing command to
terminal X3.5/X3.6
4. Terminals X3.3 & X3.4 not
shorted, if remote close is
not required.
5. Unoperational closing
release.
6. Aux. switch (S1) contacts
21-22 are open when the
breaker is closed.
7. Unoperational anti-pumping
contactor (K1) & its contacts
1. Electrical power to auxiliary
circuit is off, or MCB has tripped.
2. Loose connection,
damage to wiring.
3. Terminals X3.3 & X3.4 are not
shorted, if remote close is
not required.
4. Unoperational charging motor.
5. Limit switches S21 & S22
fail to operate
6. Mechanical failure of
operating mechanism.
Mechanical failure of operating
mechanism.
1. Closing command continues
on terminal X3.3/X3.4.
2. Terminal A2 of closing
release is shorted to earth.
Mechanical failure of operating
mechanism
1. Electrical power to
auxiliary circuit if off, or
MCB has tripped.
2. Loose connection,
damage to wiring.
3. No tripping command to
terminal X3.9.
4. Terminals X3.7 & X3.8 are not
shorted, if remote trip is
not required.
5. Unoperational tripping
release.
6. Aux. switch (S1) contacts 23-24
are open when breaker is closed.
1. Tripping command continues
on terminal X3.9.
2. Mechanical failure of
operating mechanism.
Remedial Measures
1. Check electrical power to auxiliary
circuit and/or replace blown fuses.
2. Check & repair as necessary.
3. Check for continuity & correct
logic circuit.
4. Check & repair.
5. Test closing release separately
& then replace, if not operating.
6. Check & adjust mechanical
linkage with aux. switch.
7. Check & replace, if necessary.
1. Check electrical power to auxiliary
circuit and/or replace blown fuses.
2. Check & repair as necessary.
3. Check & repair.
4. Check & replace.
5. Check & mechanical linkage with
limit switch & correct.
6. Check & contact authorised
service centres.
Check & contact authorised service
centres.
1. Check & correct logic circuits.
2. Check to find out if problem in
wiring or release. Correct as per
requirement.
Check & contact authorised service
centres.
1. Check electrical power to auxiliary
circuit and/or replace blown fuses.
2. Check & repair as necessary.
3. Check for continuity & correct logic
circuit.
4. Check & repair.
5. Test tripping release separately
& replace, if not operating.
6. Check & adjust mechanical linkage
with aux. switch.
1. Check & correct logic circuits.
2. Check & contact authorised service
centres.