RayTek LineScanner MP150, Руководство по эксплуатации

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Installation
MP150
Rev. E3 07/2013
25
5.7 Power Supply Cable
This standard cable is 7.5 m (24.6 ft.) long, free from Halogen, and withstands ambient temperatures
up to 180°C (356°F).
The linescanner requires a nominal 24 VDC power supply, 18 VDC minimum. To insure that sufficient
voltage is supplied t the linescanner, it is necessary to define the gage and the length of the power
cable to determine the resistance and the voltage drop. The maximum current draw of the linescanner
is 1 A.
The following table shows typical parameters from shielded 2 wire copper cables and the maximum
recommended cable length.
Cable gauge Resistance per m
(1 wire)
Voltage drop per m at 1 A
(2 wire)
Max. cable length
0.5 mm²
0.040
Ω
/m
0.080 V/m 75 m
0.56 mm² (AWG 20)
0.034
Ω
/m
0.068 V/m 88 m
0.75 mm²
0.027 Ω /m
0.054 V/m 111 m
0.82 mm² (AWG 18)
0.023
Ω
/m
0.046 V/m 130 m
1.0 mm²
0.020
Ω
/m
0.040 V/m 150 m
1.31 mm² (AWG 16)
0.015
Ω
/m
0.030 V/m 200 m
1.5 mm²
0.014 Ω /m
0.028 V/m 214 m
2.08 mm² (AWG 14)
0.009
Ω
/m
0.018 V/m 333 m
Tab. 1: Maximum allowed cable length from a 24 VDC power supply to the linescanner
The linescanner is equipped with an electronic fuse to prevent damage from voltage spikes greater
than 36 V on power or signal lines. If the fuse circuit switches the power off, disconnect the power line
for several seconds and turn power on again.
5.8 Warm-Up time
For accurate temperature readings we recommend a 30 minute warm-up period after power on.
During this time the internal calibration sources will be stabilized. Digital communication and the
analog outputs can be started 60 seconds after power on.