Connection and commissioning
5.4 Function test of the ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
188
Manual, 10/2018, L1V30499596002-01
In the following table, the functions and properties of the ETU to be tested are described. For
the necessary tests, see the relevant chapters (e.g. commissioning, maintenance, etc.)
The ETU can be supplied with power through the TD310, TD410, or TD420 test devices.
Test
Checks
LED test
(ETUs of the 3-
series)
1.
Connect the test device TD410 or TD420 to the ETU.
2.
Press the test button of the ETU for at least 6 seconds, but for no longer than 9 seconds.
Release the key as soon as the LEDs on the ETU light up.
3.
Check whether the following LED sequence is followed correctly:
–
LEDs of S, I, and G light up.
–
LED of L changes three times between yellow and red.
–
All LEDs go out.
Battery test
The battery test is integrated into the LED test.
•
If the battery is missing or flat, the LED of L flashes yellow five times after the LED test.
•
If the battery is working normally, the LED test is passed as described above.
Protection function
test
1.
Make sure that the circuit breaker is in the CLOSED (ON) position and that the main circuits are
not carrying any current.
2.
Connect the ETU via the TD410 or TD420 test device with a laptop on which the powerservice
software is installed.
3.
Run the protection function test with powerservice and check whether all protection functions are
working correctly.
Trip test
(ETU of the 3-
series)
1.
Make sure that the circuit breaker is in the CLOSED (ON) position and that the main circuits are
not carrying any current.
2.
Connect the test device TD410, TD420, or TD310 to the ETU.
3.
Press the test key of the ETU for at least 9 seconds.
4.
Check whether the circuit breaker has tripped or the TU reset button has moved forward.
Trip test
(ETUs of the 6-
series)
1.
Make sure that the circuit breaker is in the CLOSED (ON) position and that the main circuits are
not carrying any current.
2.
Connect the ETU via the TD410 or TD420 test device with a laptop on which the powerconfig
software is installed.
3.
Perform the trip test with powerconfig
4.
Check whether the circuit breaker has tripped or the TU reset button has moved forward.