ADB Safegate SafeLED IQ SL-RGL-E, User Manual

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The light is available in a 6.6A constant current version or in VAC version and can be supplied with 4 different frangible
coupling accessories: FAA or IEC breakable coupling with 2” NPS or 2” BSP threads.
Each unit is individually packed in a durable cardboard box, labeled with its reference name and code.
4.3 Description of the light
The SafeLED IQ RGL-E is an alternately flashing yellow taxiway light fixture.
4.3.1 Electrical supply
Electrical power Designation
6.6 A / 2A constant current SafeLED IQ-……..+6.6A
90-260 Vac constant voltage SafeLED RGL-E......+VAC
4.3.2 SafeLED IQ and selection of isolation transformer
An Isolation Transformer in a series system has a specified current ratio (normally 6.6/6.6 A) that is considered to be fixed as
long as the load does not exceed the nominal wattage of the transformer.
Most manufacturers specify a certain spare capacity (20-30%).
When the load exceeds the nominal wattage, the transformer begins to saturate, the current ratio drops as a function of the
overload. To avoid this current drop (intensity drop) the nominal wattage should not be exceeded. It is even more important
in a system with SafeLED IQ where the IQ function adds a secondary load for its power consumption.
When dimensioning the isolation transformer size for a 2A-system (i.e. a series circuit with SLIQ2A that only is supposed to
run at 2A), it is important to know that the regular method by adding up the total wattage on the isolation transformer
secondary side, cannot be used. This is because a standard isolation transformer 6.6A/6.6A is marked with a maximum
wattage running at 6.6A. Following the Lenz Law of Induction, it can be seen that the dimensioning property of a transformer
is instead the total voltage, not the wattage, of the secondary side of the transformer in a 50/60Hz series circuit system. That
will get the consequence in a 2A-system, that the wattage marked on a 6.6A/6.6A isolation transformer must generally be
multiplied by the factor 0.3 to be able to find the total wattage that can be supplied from the transformer without saturating.
The secondary load of an isolation transformer in a SafeLED IQ system includes:
•
Lamp load
•
Cable losses (extension)
•
IQ function load (Option)
4.3.2.1 Lamp load
The lamp load is the total wattage of the lamp or lamps connected in series.
4.3.2.2 Cable losses (Extension)
The (extension) cable between the isolation transformer and the lamp adds losses that cannot always be ignored, for
example:
2.8-6.6A Operation
2.5 mm2 Cu-wire: 0.6 W/m
4 mm2 Cu-wire: 0.4 W/m
2A Operation
2.5 mm2 Cu-wire: 0.06 W/m
4 mm2 Cu-wire: 0.04 W/m
SafeLED IQ Elevated Light
Introduction
10
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