Siemens SENTRON 3WA1 - Troubleshooting; Troubleshooting for Circuit Breaker

3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
541
Troubleshooting
8
8.1 Troubleshooting for circuit breaker
General troubleshooting
Fault
Cause
Remedy
Circuit breaker cannot be closed:
Circuit breaker is not ready to close.
Stored-energy spring is not charged.
Charge the stored-energy spring.
The undervoltage release is not
energized.
Connect the undervoltage release to
the power supply.
Mechanical reclosing lockout is
active.
Eliminate the trip cause by the
electronic trip unit and press the
reset button.
Electrical closing lockout is active.
Disconnect the control voltage of the
closing lockout.
1)
The O / OPEN button is locked with
padlocks (accessory).
Remove the padlocks.
1)
The O / OPEN button is locked with a
safety lock (accessory).
Release the O / OPEN button.
1)
The emergency OPEN button is
locked in the OPEN position
(accessory).
Unlock the emergency OPEN button
(turn in the counterclockwise
direction).
1)
The lock to prevent closing when the
control cabinet door is active
(accessory).
Close the control cabinet door.
Mechanical interlocking is active
(accessory).
Open the interlocked circuit breaker
or rack it to the disconnected
position.
1)
Electronic trip unit is incorrectly
installed.
Install the electronic trip unit
correctly.
The shunt trip is energized.
Switch off the shunt trip.
Closing coil is energized.
Disconnect the closing coil from the
control voltage for a short time.
Circuit breaker cannot be closed:
Circuit breaker is ready for operation.
The control voltage of the closing coil
is incorrect or not present.
Check the control voltage.
1)
Safety device. The safety measure can only be removed after it has been checked that this is operationally
permissible.