IOM – VL71 FLOODLIGHT
VL71 IOM
IECEx
ATEX
Issue 02
May 08
5
removed by releasing four screws. The baffle plate is removed by undoing 2 x M5 nuts at the base. Reselect the voltage
tapping if necessary. No more than one single or multiple strand lead shall be connected into either side of any terminal,
unless multiple conductors have been joined in a suitable manner, e.g. two conductors into a single insulated crimped
bootlace ferrule. Leads connected to the terminals shall be insulated for the appropriate voltage and this insulation shall
extend to within 1mm of the metal of the terminal throat. All terminal screws, used and unused, shall be tightened down to
between 1.2 Nm and 2 Nm. The cover is replaced and the toggle clamps snapped back over.
3.7
Fitting Lamps
Make sure the correct lamp is selected, access for fitting lamps is gained through the lampglass cover, as above. The lamp
should be firmly screwed into place.
3.8
Inspection and Maintenance
Visual inspection should be carried out at a minimum of 12 monthly intervals and more frequently if conditions are severe,
refer to (IECEx)
EN 60079-17
. The time between lamp changes could be very infrequent and this is too long a period without
inspection.
3.8.1
Routine Examination
The equipment must be de-energised before opening and note taken of the rated opening delay periods alternatively the
nameplate may read ‘do not open when an explosive gas atmosphere is present’. Individual organisations will have their own
procedures. What follows are guidelines based on
(IECEx) EN 60079-17
and on our experience:
1
Ensure the lamp is lit when energised and that the lampglass is not damaged.
2
When de-energised and left to cool there should be no significant sign of internal moisture. If there are signs of water
ingress, the luminaire should be opened up, dried out, and any likely ingress points eliminated by re-gasketting, re-
greasing or other replacement.
3
Check the cable gland for tightness and tighten if necessary.
4
Check any external earthing.
5
Examine the glass for any signs of damage. Clean glass.
6
When relamping, check that the cover gasket has not softened or become excessively deformed, if in doubt replace
(see section 4.0 ).
Important :
Where spares are needed, these must be replaced with manufacturers parts.
No modifications should be made without the knowledge and approval of the
manufacturer.
3.9
Electrical Fault Finding and Replacement
The supply must be isolated before opening the luminaire.
Control gear will not normally go open circuit unless it has overheated first and the signs of this are obvious, being severe
discoloration of the paint on the gear and cracks in any exposed insulation. Similarly, a bad contact at the lamp cap will
usually result in signs of overheating. Any fault finding must be done by a competent electrician and, if carried out with the
luminaire in place, under a permit to work.
With HPS and MBI lamps the ignitor can become faulty. If the lamp is fitted, the choke has continuity and the connections are
good and correct, they should produce an 'attempt to start' effect and a buzzing sound from the ignitor. It will be unusual to
have no other parts available to perform a substitution fault finding routine and this is the normal procedure. Before re-
assembling, all connections should be checked and any damaged cable replaced. The ignition connection to the lampholder
is sleeved with a high temperature silicone sleeve and this must be kept in place.
3.9.1 Thermal Protector
Thermal protectors are included. If the lamp goes on and off over a timescale of several minutes, this could be the thermal
protector operating. The causes are defective lamps/diode effects, gross over voltage or the choke beginning to fail and this
should be investigated directly. Also see section 3.4.
