EUCHNER MGB (V2.0.0) - Manual (Page 8)

MGB Help for Setup and Service
3.3 LED DIA illuminated + LED STATE flashes 2 times
(single wiring – only AR mode)
Fault symptom:
The MGB displays the fault state “input error (e.g. missing test pulses)”.
Possible fault causes:
 24 V DC missing at inputs Fl1A and/or Fl1B
 A safety evaluation device or a safe control system with clocking outputs is connected to FI1A and/or FI1B.
Remedy:
1. Check the wiring and correct it if necessary or switch to AP mode.
2. Switch the voltage off
or
press the reset button (if present) that controls the integrated reset input.
3. Close the door(s).
4. Switch the voltage on again
or
release the reset button
5. Wait until the STATE LED flashes with the code “LONG ON, SHORT OFF”.
 The MGB is now ready for operation again
3.4 LED DIA illuminated + LED STATE flashes 2 time
(series wiring – only AR mode)
Fault symptom:
The MGB displays the fault state “Input fault (e.g. missing test pulses, illogical switching state of upstream
switch)”
Possible fault causes:
 24 V DC missing at inputs Fl1A and/or Fl1B of the first MGB
 In case of series operation, FI1A is connected with FO1B or FI1B is connected with FO1A
 In case of series operation, conventional safety components (switching contacts) are connected to FI1A
and/or FI1B
 A safety evaluation unit or a safe control system with clocking outputs is connected.
Page 8/14 Subject to technical modifications 115218-01-03/12