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