EUCHNER CET - Manual (Page 5)

CET Help for Setup and Service
Page 5 of 10 Subject to technical modifications 01/2013
3 Troubleshooting
3.1 LED STATE flashes twice (separate operation)
Fault symptom:
The CET-AR displays the fault state “input error (e.g. missing test pulses)”.
Possible fault causes:
 24 V DC missing at inputs I
A
and/or I
B
 A safety evaluation unit or a safe control system with pulsing outputs is connected the inputs I
A
and/or I
B
.
Remedy:
1. Check the wiring and correct it if necessary or switch the clock pulses off
2. Switch the voltage off
or
Press the reset button (if present) that controls the integrated reset input
3. Switch the voltage on again
or
Release the reset button
4. Wait until LED STATE flashes three times or stops flashing entirely (after approx. 8 s)
5. Close the safety door
 The CET-AR is now operational again, the LED STATE stops flashing
Flashes twice