Connection and commissioning
5.5 Commissioning
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
191
5.5.2
Procedure for testing the accessories
To meet the high quality requirements of Siemens, this points are already tested if the circuit
breaker is configured in the factory.
The accessories therefore only need to be tested after installation or conversion by the user.
The following points must be considered during commissioning after conversion or
installation:
Accessories to be tested
Method
Geared motor
1. Run the geared motor for charging the springs at the appropriate nominal voltage.
Result: The springs are correctly charged. The signals are normal. When the springs
are charged, the geared motor stops.
2. Perform a few close and open operations.
Result: The geared motor charges the springs again after every closing operation.
NOTE: If there is one, switch on the undervoltage coil in advance.
Undervoltage coil
1. Run the undervoltage coil at the appropriate rated voltage and perform the closing
operation on the circuit breaker.
Result: The circuit breaker closes correctly. The behavior and the signals of the au-
xiliary switches are normal.
2. Switch off the power supply of the undervoltage release. The circuit breaker opens.
3. Operate the undervoltage coil at the appropriate nominal voltage and perform the
closing operation on the circuit breaker.
Result: The circuit breaker closes. The behavior and the signals of the auxiliary swit-
ches are correct.
Note: If the undervoltage coil is tripped by a shunt release (ST), the circuit breaker
cannot be reclosed until voltage is applied to the undervoltage coil again. Make sure
that the coil was really tripped by a power failure. Otherwise examine the circuit brea-
ker and the device in question to see whether both are fully functional.
Shunt release (ST)
1. Close the circuit breaker.
2. Operate the opening coil at the appropriate nominal voltage.
Result: The circuit breaker opens correctly. The signals at the auxiliary switches are
correct.
Closing coil (CC)
1. Open the circuit breaker.
2. Charge the springs manually or electrically.
3. Operate the closing coil at the appropriate nominal voltage.
Result: The circuit breaker closes correctly. The signals at the auxiliary switches are
correct.
Shunt release (ST) with
actuator module COM ACT
1. Supply power to the ETU with the auxiliary voltage at the Breaker Connect module.
2. Switch on the contacts of the actuator module.
3. Close the circuit breaker.
4. Choose item "Open CB" in the menu of ETUs of the 6-series.
Result: The circuit breaker opens correctly. The behavior and the signals of the au-
xiliary switches are normal.
Note: The test can be conducted if voltage is applied to the ETU and to the coils.
Closing coil (CC) with
actuator module COM ACT
1. Supply power to the ETU with the auxiliary voltage at the Breaker Connect module.
2. Switch on the contacts of the actuator module.
3. Charge the springs.
