ADB Safegate RELIANCE IQ L-852G(L), User Manual

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The secondary load of an Isolation Transformer in a RELIANCE/RELIANCE IQ system includes:
•
Lamp load
•
Cable losses (secondary cables)
•
IQ function load (Option)
3.6.2 Light fixture load
This load must be considered when calculating the total CCR load.
L-852G(L) - Runway Guard Light (RGL-I) 25 W
L-852S(L) – Stopbar Light (SB-I) 16 W
3.6.3 Cable losses (secondary cable)
The cable between the Isolation Transformer and the lamp adds losses that cannot 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
Note
Cable lengths should not exceed 100 m.
3.6.4 IQ function load (Option)
With IQ enabled, an additional load of 12 W need to be added to the transformer calculations
Note
RELIANCE IQ is not to be connected to transformers smaller than 65W.
3.6.5 2A system
When dimensioning the isolation transformer size for a 2A-system (a series circuit with RELIANCE IQ 2A which is only
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. According to the Lenz Law of Induction, the dimensioning property of a transformer is the
total voltage, and not the wattage, of the secondary side of the transformer in a 50/60Hz series circuit system.
The consequence in a 2A-system is the wattage marked on a 6.6A/6.6A isolation transformer must generally be multiplied by
the factor 0.3 to find the total wattage which can be supplied from the transformer without saturating.
Note
The same dimensioning method must be used for a CCR, as the transformer kVA-size marked on a CCR is normally
calculated at 6.6A, not at 2A. There are also more constraints to consider such as spare capacity. For more information,
contact Safegate for a complete CCR dimensioning procedure.
RELIANCE Inset Light
Introduction
12
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