Document UT-MT-0812_ENG
Page 21 of 28
Edition 19/05/2016
Suspended edition 18/12/2014
ELEVATED LEDs A APPROACH, THRESHOLD, THRESHOLD WING BAR, RUNWAY END AND STOP BAR LERA
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
4.2
FIELD INTERVENTIONS: REMOVING AND OPENING THE FIXTURE
WARNING: operate always when the light is not powered.
4.2.1
Fixture removal
If it is necessary to replace the complete fixture, operate as follows:
remove the light unit from the breakable coupling, from the supporting pole or from the
frangible-lowering mast, releasing the locking screws of the support with vertical aiming adjusting
device and unscrewing the nut of the bulkhead connector. Remove the external grounding wiring
too, when provided. In this way the existing electrical connections can be reused (fig. 17)
replace the light unit, reconditioning the electrical connections
aiming the fixture following the instructions of the specific manuals (see para 3.4).
Figure 17: bulkhead connector electrical connection
4.2.2
Opening the light unit
If the light unit is off, it is not necessary replace completely it. In this case it is enough to replace only the
electronic cover-LED support assembly and then check inside the maintenance center which is the faulty
component.
To remove the
To remove the electronic cover-LED support assembly operate as follows (fig. 18):
unscrew in the rear side the four captive screws
pull out the electronic cover-LED support assembly
disconnect the power supply and grounding wires
replace the faulty assembly with a new equivalent one
reconnect the power supply and grounding wires
screw the four captive screws
NOTE: no new adjustments are necessary.
UNSCREW
