General Arrangement - MEDC XB4 Manuel Technique

Access to Terminals – Exd Units:
Unscrew the 3 off M8 screws (6.0mm A/F hexagon key) holding the cover assembly to the base. The cover
screws are captive and will be retained in the cover assembly.
Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove to
gain access to the interior. The cover will be remain attached to the base by means of a retention chain
Unscrew the 3 off slotted screws holding the electronics assembly into the unit and lift the electronics assembly
clear of the unit, exposing the terminal block and internal earth stud. The slotted screws are captive and will be
retained in the PCB mounting holes. The electronics assembly will remain attached to the enclosure by means of
a nylon retention strap. Care must be taken to avoid damage to the xenon tubes during cable termination.
Once termination is complete, carefully replace the electronics assembly onto the mounting pillars and secure
with the 3 off slotted screws.
Carefully replace the cover assembly back onto the base, avoiding damage to the mating surfaces, and ensuring
the o-ring remains correctly seated in its groove during re-assembly. Fully tighten the 3 off M8 cover screws (6.0mm
A/F hexagon key). Ensure the required gap (0.15mm max.) is maintained between the cover and enclosure
Access to Terminals - Ex de Units:
Unscrew the 2 x M5 retained cover screws in the cover of the Ex e chamber (4.0mm AF hexagon key).
Remove the Ex e cover from the terminal chamber, exposing the terminal block and the internal earth stud.
See Cable Termination.
After cable termination has been completed, the cover can be replaced and secured with the 2 x M5 fixing
screws. Maximum torque 4NM.
3.0 OPERATION
The operating voltage of the unit is stated on the unit label.
The Beacon can either be powered directly or initiated by means of a telephone ringing signal or remote 24Vdc
supply via a relay if specified when ordering. See documentation supplied with the beacon for confirmation of
initiation method
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GENERAL ARRANGEMENT

© Eaton MEDC Ltd 2017