Siemens SENTRON 3WL10 - Page 193

Display of the LED ACT
The LED name "ACT" stands for ACTIVE. This LED indicates that the ETU is ready for operation.
If the LED does not light up, the power supply of the ETU is interrupted and the ETU is not
ready to operate.
ACT Alarm / status Measure / comment
Flashing slowly
(1 Hz; 0.1 s on / 0.9 s o󹪜)
ETU ready No measures required
O󹪜
ETU without power supply Check the power supply of the
ETU via the main circuit or the
auxiliary conductors.
LED displays of the protection releases
L S I G

Alarm / status Measure / comment
Flashing fast
(2 Hz)
Flashing fast
(2 Hz)
Flashing fast
(2 Hz)
Flashing fast
(2 Hz)
Auxiliary solenoid clos‐
ing coil / shunt trip
(CC/ST) not connected
or
trip command failed
Check connections.
Flashing slowly
(0.5 Hz)
Flashing fast
(2 Hz)
Flashing fast
(2 Hz)
Flashing fast
(2 Hz)
Current sensor not con‐
nected
Check connections.
Flashing slowly
(0.5 Hz) with 2 s
pause
Flashing slowly
(0.5 Hz) with 2 s
pause
Flashing slowly
(0.5 Hz) with 2 s
pause
Flashing slowly
(0.5 Hz) with 2 s
pause
Fault in rating
plug
Check the connection
between the release
and the rating plug.
Perform installation.
Flashing slowly
(0.5 Hz)
Flashing slowly
(0.5 Hz)
Flashing slowly
(0.5 Hz)
Flashing slowly
(0.5 Hz)
Internal con󹪝gu-
ration error
Contact Siemens Tech‐
nical Support.
On

On
 Tripping on hardware
fault
Check the circuit break‐
er and accessories.
Operation
6.2Alarms
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
192 Equipment Manual, 10/2023, L1V30499596002-03