Wybron Luminaire Nexera LX, Руководство пользователя

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Nexera LX User Manual
Updated March 2009
Page 31
Head-Feet Restrictions
Head-Feet is defined as “the sum of cable lengths from each Nexera LX unit to a
single power supply output.” The Head-Feet parameter is a method of accounting
for the voltage drop in the power/signal cable caused by the current drawn by each
color module.
To help understand this issue, think of it as water pressure (voltage) in a hose
(cable) where you have multiple water sprinkler heads (Nexera LX units). If the
hose (cable) is too long, or there are too many sprinkler heads (color modules), the
water pressure (voltage) will be too low.
Use the following equation to determine total Head-Feet:
Head-Feet = [(A)+(A+B)+(A+B+C)+….]
where:
A = Cable length from power supply to first color module
B = Cable length between first and second color module
C = Cable length between second and third color module
and so on.
The maximum Head-Feet for each of the Nexera LX fixtures is as follows
Model 2560 Nexera LX Wash - Tungsten 1500 Head-Feet max.
Model 2570 Nexera LX Profile - Tungsten 1500 Head-Feet max.
Model 2640 Nexera LX 19º-26º Profile - Tungsten 1500 Head-Feet max.
Model 2580 Nexera LX Wash - CDM
1500 Head-Feet max.
Model 2600 Nexera LX Profile - CDM 1500 Head-Feet max.
Model 2650 Nexera LX 19º-26º Profile - CDM 1500 Head-Feet max.
Head-Feet Example
In the figure above, four Nexera LX fixtures are daisy-chained off of the same
power supply output. Using the equation given above, total Head-Feet can be
calculated as follows:
A
100 feet
B
25 feet
C
20 feet
D
25 feet
B
25 feet
C
20 feet
D
25 feet
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