MEDC XB9 Manuel Technique page 3

English
1.0 INTRODUCTION
These compact and lightweight beacons have been designed for use in potentially explosive atmospheres and harsh
environmental conditions. The beacon housing, including the flamepaths, is manufactured completely from a UV
stable glass reinforced polyester which is ideally suited for use offshore and onshore.
Stainless steel screws and mounting bracket are incorporated ensuring a totally corrosion free unit.
Units can be painted to customer specification and supplied with identification labels
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and
operation should be referred to e.g. IEE Wiring Regulations and the 'National Electrical Code' in North America.
Additional national and/or local requirements may apply.
Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry points and
that the NEMA/IP rating of the unit is maintained. MEDC recommend the use of a sealing compound such as
HYLOMAR PL32 on the threads of glands and stopping plugs in order to maintain the IP rating of the unit.
The beacon is mounted via the 3 off !7mm mounting holes in the standard L-shaped bracket fixed to the base of
the unit. The holes have been designed to accept and M6 screw or bolt.
MEDC recommend the use of stainless steel fixings. Ensure that all nuts, bolts and fixings are secure.
Note that if the beacon is to be used in high amplitude vibration applications, a secondary restraint would be
advisable. Please contact MEDC for details.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
Unscrew the set screw in the cover assembly one full turn (2.0mm A/F hexagon key).
Using an 80-90mm hook spanner, carefully unscrew and remove the cover assembly. Once the cover assembly has
been removed, slide the PCB assembly out of the unit until the terminals clear the enclosure body.
Cable termination should be in accordance with specifications applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram provided
with the product.
Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded and correctly
earthed.
All cable glands should be of an equivalent NEMA/IP rating to that of the beacon and integrated with the unit such
that this rating is maintained.
Ensure there is not too much slack of cable cores within the unit due to space limitations.
After cable termination has been completed, the PCB can be fully inserted into the enclosure, ensuring the spacer on
the bottom of the PCB 'snaps' into the retaining clip on the boss inside the enclosure base.
To replace the cover, use the same procedure as above but in reverse manner, ensuring the cover is screwed down
tightly and ensuring there is no damage to the thread surfaces or mating faces of the cover and enclosure. There
should be a maximum gap of 0.2mm between the faces of the cover and enclosure to ensure correct o-ring
compression. Once assembled, ensure the set screw in the cover assembly is fully tightened to secure the cover.
© MEDC 2015 04/15