EUCHNER MGB (V2.0.0) - Manual (Page 10)

MGB Help for Setup and Service
3.6 LED DIA illuminated + LED STATE flashes 4 time (AR and AP modes)
Fault symptom:
The MGB displays the fault state “output fault”.
Possible fault causes:
 The connected control system and the MGB do not have a common reference potential (common ground)
 A ground loop has been produced by bridges having been installed both on the MGB and in the control
cabinet (refer to the system manual for this purpose).
 The internal output circuit is damaged.
 24 V DC or 0 V is present at one of the two safety outputs during the switch-on process.
 A safety evaluation unit or a safe control system with clocking outputs is connected.
Remedy:
2. Check the wiring and correct it
3. Switch the voltage off at all devices
or
press the reset button (if present) that controls ALL integrated reset inputs in the series connection
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”.
6. The MGBs are now ready for operation again if no fault occurred in the internal output connection.
3.7 LED DIA illuminated + LED Lock flashes 1 time (AR and AP modes)
Fault symptom:
The MGB displays the fault state “signal sequence incorrect”
Possible fault causes:
 Actuator broken.
 EMC interference.
 Hardware fault in the handle module
 Different potentials between fence and door.
Remedy:
1. Open all safety doors on which the LED Lock is flashing (irrespective of the number of flashing pulses) so
that no passage is possible.
2. Switch the voltage off at all devices
or
press the reset button (if present) that controls the integrated reset inputs.
3. Switch the voltage on again
or
release the reset button
4. Wait until the STATE LED flashes with the code “LONG OFF, SHORT ON”.
5. Close the safety doors
 If there is no internal fault (break), the MGBs are now ready for operation again.
Page 10/14 Subject to technical modifications 115218-01-03/12