MEDC XB11 Manuel Technique page 2

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1.0 INSTALLATION
The XB11 can either be directly mounted using inserts moulded into the back of the enclosure (standard), or a backstrap
(optional) can be fixed to the unit thus giving an optional mounting position for when direct mounting is deemed unsuit-
able.
The fixings for direct mounting are 2 x M5 inserts in the back of the unit with 110mm between centres, the fixings for the
backstrap are 2 x M5 inserts in the back of the base that attach the backstrap to the unit then there are 2 x Ø8.5 clear-
ance holes on the backstrap with 170mm between centres for fixing the unit.
*Please note: For direct mounting, please observe the following formula to determine length of fixing screw required:-
Length of Screw = 10mm + Thickness of Mounting Surface.
For further details see attached data sheet.
1.1 Removing/Replacing the Cover Assembly prior to Cable Termination
Remove the 6 x M5 screws holding the cover to the base (see Note 1).
Twist the cover gently clockwise and anticlockwise, while pulling away from the base until the cover is removed.
Cable termination should be in accordance with specifications applying to the application. MEDC recommend that all
cables and cores should be fully identified.
Ensure that only the correct certified glands are used and that the assembly is shrouded and correctly earthed.
To replace the cover use the same procedure as above but in the reverse manner.
1.2 General
Cable termination should be in ac-cordance with specifications apply-ing to the application. MEDC recommend
that all cables and cores should be fully identified.
Ensure that only the correct certi-fied glands are used and that the assembly is shrouded and correctly
earthed.
Ensure there is not too much slack of cable cores within the unit, due to space limitations.
Ensure that only the correct certi-fied stopping plugs are used to blank off unused gland entry points. We recom-
mend the use of 'hyLOMAR PL32 COMPOuND' on the threads of stopping plugs in order to maintain the IP67
rating of the unit.
2.0 OPERATION
The beacon can be powered directly or initiated by a telephone line if requested when ordered.
3.0 MAINTENANCE
During the working life of the unit, it should require little or no maintenance. GRP will resist attack by most acids, alkalis
and chemicals and is as resistant to concentrated acids and alkalis as most metal products.
however, if abnormal or unusual environmental conditions occur due to plant damage, accident etc. then visual inspec-
tion is recommended.
If the unit requires cleaning, then only clean exterior with a damp cloth to avoid electro-static charge build-up.
Replacement of the xenon tube, see 3.1 below, can be carried out by competent site personnel. Other repairs should be
undertaken by returning the unit to MEDC or by an authorised repairer of Ex equipment.
If you acquired a significant quantity of units, then it is recommended that spares are also made available.(Please discuss
your requirements with our Technical Sales Engineers).
3.1 Removing/Replacing Xenon Tube
CAuTION : Before removing the cover assembly, ensure that the power to the unit is isolated.
Remove the 6 x M5 screws holding the cover to the base (see Note 1).
Twist the cover gently clockwise and anticlockwise, while pulling away from the base until the cover is removed.
Remove the two M3 nuts holding the circuit board to the cover.
Lift the electronic assembly away from the support pillars, thus exposing the xenon tube. Remove the old tube by unscrew-
ing the terminal block fixings. The replacement xenon tube can now be fitted (see xenon tube installation sheet, which is
supplied with the replacement tube).
To replace the electronic assembly and cover use the same procedure as above but in reverse manner.
11/07 © MEDC 2003