EUCHNER CET - Manual (Page 7)

CET Help for Setup and Service
Page 7 of 10 Subject to technical modifications 01/2013
3.4 LED STATE flashes 4 times (separate or series operation)
Fault symptom:
The CET-AR displays the fault state “output fault”.
Possible fault causes:
 The evaluation unit connected to the CET and the CET do not have a common reference potential (common
ground)
 A ground loop has been produced by bridges having been installed both on the CET and in the control cabinet
(refer to the system manual for this purpose).
 The internal output circuit is damaged.
 24V present at output O
A
or O
B
Remedy:
1. Check the wiring and correct it
2. Switch off the voltage on the CET
or
Press the reset button that controls ALL reset inputs of the series circuit
3. Switch the voltage on again
or
Release the reset button
4. Wait until LEDs DIA1 flash three times or stop flashing entirely (after approx. 8 s)
5. Close the safety doors
 The CETs are now ready for operation again if no fault occurred in the internal output connection.
Flashes four times