Siemens SENTRON 3WL10 Series Manual page 164

Operation
6.2 Alarms
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
Flashing slowly
(1 Hz; 0.1 s on / 0.9 s off)
Off
LED displays of the protection releases
L S
Flashing fast Flashing fast
(2 Hz) (2 Hz)
Flashing slowly Flashing fast
(0.5 Hz) (2 Hz)
Flashing slowly Flashing slowly
(0.5 Hz) with 2 s (0.5 Hz) with 2 s
pause pause
Flashing slowly Flashing slowly
(0.5 Hz) (0.5 Hz)
162
Alarm / status
ETU ready
ETU without power supply
I G
Flashing fast Flashing fast
(2 Hz) (2 Hz)
Flashing fast Flashing fast
(2 Hz) (2 Hz)
Flashing slowly Flashing slowly
(0.5 Hz) with 2 s (0.5 Hz) with 2 s
pause pause
Flashing slowly Flashing slowly
(0.5 Hz) (0.5 Hz)
Measure / comment
No measures required
Check the power supply of the
ETU via the main circuit or the
auxiliary current conductors.
Alarm / status Measure / comment
Auxiliary solenoid Check connections.
closing coil / shunt
release (CC/ST) not
connected or
trip command failed
Current sensor not Check connections.
connected
Fault in rating Check the connection
plug between the release
and the rating plug.
Perform installation.
Internal configuration Contact Siemens
error Technical Support.
Manual, 11/2017, L1V30499596002-01
Air circuit breaker 3WL10