Accessories
3.7 Accessories for the Electronic Trip Unit
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
89
Switching the line voltage
Operation
When the power supply is connected, the status test starts automatically with the querying of
different electronic trip unit components and parameters. If the status test is successful, the
"ETU STATUS" LED lights up (continuous light). If the test is not successful, this means that
the electronic trip unit or one of its components is either defective or has not been installed.
Electronic trip unit defective
• Parameters set incorrectly
• Current transformer incorrectly terminated
• Tripping solenoid F5 incorrectly connected or defective
• Electronic trip unit defective
The status test can be repeated at any time by means of the "START" button (press for at least
3 s). The status test can also be carried out on electronic trip units that have already been
activated. In this case, note that the "ETU STATUS" LED may flash twice briefly when the result
of the status test is signaled even if no fault is present. To be on the safe side, the electronic
trip unit should be deactivated and the status test repeated.
Testing the transformers
To test the energy and current transformers, press the "START" button (for less than 2 s).
If the LED lights up, this means that the transformer is functioning properly. If the LED
flashes, the transformer is either not installed, incorrectly connected, or defective.
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