NDC BETA LaserMike LaserSpeed Pro 8500-4, Инструкция по эксплуатации, Страница: 310 / 348

15-2 LaserSpeed Pro 8500-4 Instruction Handbook: Supply Voltage Requirements
15.1.1 Voltage Drop using Single Supply/Single Return
Example : Your power supply is 200 feet (61 meters) away from the LS8500-4. You are using a single 20
AWG wire to supply power to pin 24, and a single 20 AWG wire as a ground (connected to pin 12). Your volt-
age drop in the cable will be:
Voltage Drop = #Feet * Voltage Drop/Foot = 200 * 0.041 = 8.2 volts
In order to deliver at least 20 volts to the LS8500-4, your power supply will need to be greater than 28.2 volts.
The supply should not be higher than 30VDC, or damage may occur.
15.2 Quad Conductor Supply
If you are using four conductors (two supply, two return wires), the following table will help you determine your
total voltage drop across the cable.
Wire Size
(AWG) Wire Size
(mm
2
)
Voltage Drop per
Foot (@2.0A) Voltage Drop per
Meter (@2.0A)
26 0.129 0.082 0.27
24 0.205 0.051 0.17
22 0.326 0.032 0.11
20 0.518 0.020 0.067
18 0.823 0.013 0.042
16 1.31 0.008 0.026
14 2.08 0.005 0.017
12 3.31 0.0032 0.010
Example : Your power supply is 200 feet (61 meters) away from the LS8500-4 gauge. You are using two 20
AWG wires to supply power to pin 24 and 25, and two 20 AWG wire as a ground (connected to pins 12 and
13). Your voltage drop in the cable will be:
Voltage Drop = #Feet * Voltage Drop/Foot = 200 * .020 = 4 volts
In order to deliver at least 20 volts to the LS8500-4, your power supply will need to be at least 24 volts.
Note : All NDC Technologies supplied cables have connections for quad conductor supply. In order to take
advantage of all conductors, you need to be sure to supply power to both pins 24 and 25, and tie the two
ground pins (12 and 13) together. The wires are not necessarily tied together inside the cable.