EUCHNER CET - Manual (Page 8)

CET Help for Setup and Service
Page 8 of 10 Subject to technical modifications 01/2013
3.5 LED STATE flashes five times
Fault symptom:
The CET displays the fault state “internal fault”.
Possible fault causes:
 This state occurs in the event of an internal fault
Remedy:
1. Switch all devices' voltage off
or
Press the reset button (if present) that controls the integrated reset inputs
2. Switch the voltage back on
or
Release the reset button
3. Wait until LEDs DIA1 flash three times or stop flashing entirely (after approx. 8 s)
4. Close the safety doors.
 If there is no internal fault, the CETs are now ready for operation again.
3.6 Separate operation functions on the safety relay, but not series
operation
Fault symptom:
The connection of a separate CET-AR to a safety relay functions, but the connection in series to a safety relay does
not function despite correct wiring. The safety relay displays a fault or does not switch on.
Possible fault causes:
 The first CET-AR is connected to the safety relay with its inputs I
A
and I
B
, and the current that the safety relay can
supply is insufficient.
Remedy:
Connect the first inputs I
A
und I
B
directly to the 24 V DC power supply.
Flashes five times