WEG ABW Series, Instruction Manual

Page: 54 / 164

www.weg.net
54 | ABW - Air Circuit Breaker
8 FAILURES AND DIAGNOSES
Defect Probable cause Corrective actions
The circuit breaker interrupts a shortage, but
the mechanical reset button does not go out.
1. There is no control voltage or the
undervoltage coil is damaged.
1. Check control voltage.
2. Variation of control voltage. 2. Check control voltage.
The circuit breaker opens instantaneously to
a closing operation, and the mechanical reset
button goes out.
1. There is a short-circuit.
1. Eliminate short-circuit before reconnecting
circuit breaker.
2. Very high current in closing.
2. Check the electrical circuit or revise
protection unit adjustment parameters.
The circuit breaker opens normally by manual
command, but not by electrical command.
1. Very low control voltage. 1. Check control voltage (0.6~1.1Vn).
2. Defect in undervoltage coil. 2. Change undervoltage coil.
The circuit breaker does not open by manual
command.
1. Defect in operation mechanism. 1. Contact WEG.
The circuit breaker does not close, by manual
or electrical command.
1. The circuit breaker closed under short-circuit.
1. Eliminate short-circuit. Check state of circuit
breaker.
2. Mechanical reset button was not reset. 2. Reset the mechanical reset button.
3. Instability in operation of extraction/insertion. 3. Check operation of extraction/insertion.
4. Anti-pumping function. 4. Try again, after de-energizing closing coil.
5. Unloaded springs.
5. Check power supply of motorized drive.
Check if manual loading functions suitable.
6. Defect in closing coil.
6. De-energize closing coil. Re-energize coil
and check operation of circuit breaker.
7. Energized opening coil. 7. De-energize opening coil.
8. Defect or undervoltage in undervoltage coil.
8. Energize undervoltage coil (V>0.85Vn) and
try to close the circuit breaker by closing coil.
9. Circuit breaker with mechanical interlocking
installed.
9. Check mechanical interlocking.
The circuit breaker closes normally by manual
command, but not be electrical command.
1. Very low control voltage in closing coil. 1. Check command voltage (0.75~1.1Vn).
2. Defect in closing coil. 2. Change closing coil.
The circuit breaker does not load the springs
electrically.
1. Unsuitable control voltage.
1. Check control voltage.
2. Check motorized drive circuit.
2. Defect in motorized drive. 3. Contact WEG.
Maneuver rod does not go in opening.
1. Obstruction by the Off button.
1. Tighten Off button while inserting rod in
opening.
2. Obstruction by blocking of padlock. 2. Remove padlock, releasing blocking.
3. Poor positioning of circuit breaker in
extraction car.
3. Position circuit breaker correctly in
extraction car.
Impossible to extract the circuit breaker.
1. Extraction rod is inserted. 1. Remove extraction rod.
2. Circuit breaker is not in disconnected
position.
2. Place circuit breaker correctly in
disconnected position.
3. Obstruction by blocking of padlock. 3. Remove padlock, releasing blocking.
Impossible to insert the circuit breaker.
1. Circuit breaker and extraction car are
incompatible as regards size.
1. Use compatible unit.
2. Unsuitable positioning of lever. 2. Reposition lever to right.
3. Cutters blocked by padlock. 3. Remove padlock.
Table 8.1: