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Methodology used in the calculations for powering Wybron color scrollers.

From the RAM Power Supply User Manual:
Head-Feet Restrictions
The HEAD-FEET parameter is a method of accounting for the voltage drop in the RAM
power/signal cable caused by the current drawn by each device.
To help understand this issue, think of it as water pressure (voltage) in a hose (cable)
where you have multiple water sprinkler heads (color changers). If the hose (cable) is
too long or you have too many sprinkler heads (color changers), the water pressure
(voltage) will be too low.
HEAD-FEET is defined as "the sum of cable lengths from each device to a single power
supply output".
Refer to the chart on page 6 of this manual and the user manual of the specific
components for detailed head-feet information on those products.

"Head-Feet" Example:
There are four Coloram II color changers connected to a power supply. The RAM Cable
between the power supply and the first Coloram II is 100 feet long. The cables between
each of the Coloram IIs is 20 feet long.

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The amount of cable from the power supply to:
1st Coloram II 100 ft
2nd Coloram II 120 ft
3rd Coloram II 140 ft
4th Coloram II 160 ft
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Total: 520 Head-Feet