Siemens SENTRON 3WL10 - Function Test of the ETU

Mounting the spring charging motor
5.4 Function test of the ETU
WARNING
Hazardous voltage
The power supply of the ETUs through the main circuits must only be used after commissioning.
Before the ETU can be supplied with power through the main current paths, the tests in the
chapter on commissioning (see Chapter "Commissioning (Page178)") must be performed.
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 󹪞at, the LED of L 󹪞ashes yellow 󹪝ve times after the LED test.
• If the battery is working normally, the LED test is passed as described above.
Connection and commissioning
5.4Function test of the ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03 177