9 – 101
Testing the current and energy sensors
To test the current sensors and energy transducers, press the "START" button.
A lit-up LED confirms the proper operation of the corresponding sensor/converter. If an LED flashes, the corresponding sensor/converter is
not present, not properly connected, nonconforming, or a transformer without power supply is connected.
Testing the tripping function
To test the tripping function, press one of the buttons "L", "S", "I", "N" or "G".
Long-time delayed tripping Test
If the test is successful, the "ETU STATUS" LED will light up a solid green. If errors are detected (the trip unit malfunctions),
the "ETU STATUS" LED will flash. Count the number of flashes to determine the fault (all fault codes are listed on page 9-104).
1 Charge the circuit breaker
2 Close the circuit breaker
3 Press the [L] button
The circuit breaker will trip after the set long-time delay time, plus approx. 2 seconds processing time, has elapsed. If the test device has
completed a test without faults, the "ETU STATUS" LED will light up continuously green. If a fault is detected, the LED will flash. The type of
flashing indicates what type of fault is present (fault codes are listed on page 9-104).
Short-time delayed tripping Test
The short-time delayed short-circuit tripping function and the trip unit circuitry can be tested using the test device.
1 Charge the circuit breaker
2 Close the circuit breaker
3 Press the [S] button
The circuit breaker will trip after the set short-time delay time, plus approx. 2 seconds processing time, has elapsed. If the test device has
completed a test without faults, the "ETU STATUS" LED will light up continuously green. If a fault is detected, the LED will flash. The type of
flashing indicates what type of fault is present (fault codes are listed on page 9-104).
Instantaneous tripping test
The instantaneous tripping function and the trip unit circuitry can be tested using the test device.
1 Charge the circuit breaker
2 Close the circuit breaker
3 Press the [I] button
The circuit breaker will trip after approx. 2 seconds processing time. If the test device has completed a test without faults, the "ETU STATUS"
LED will light up continuously green. If a fault is detected, the LED will flash. The type of flashing indicates what type of fault is present (fault
codes are listed on page 9-104).
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