Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 4 Installing DIN Rail Mount Transmitter
QmBS Sensor / QTA Transmitters
4-2
The following requirements apply:
•
19.2 to 28.8 VDC at the power terminals, at a load current of 330 mA
•
6.3 watts maximum
•
At startup, the transmitter power source must provide a minimum of 1.0 amp of short-term
current per transmitter
To size the cable, refer to Table and use the following formula as a guideline:
Minimum Supply Voltage = 19.2V + (Cable Resistance x Cable length x 0.33 A)
Applying AC voltage to the transmitter will damage
the device.
To avoid damaging the transmitter, do not connect it to an
AC power supply.
Table 4-1 Typical Power Cable Resistances at 68 °F (20 °C)
Gauge
Resistance
a
a.
These values are based on copper wire, and include the resistance of both wires in a cable. If you are using a
material other than copper, refer to the resistivity specifications for your wire type
.
14 AWG
0.0050
Ω
/foot
16 AWG
0.0080
Ω
/foot
18 AWG
0.0128
Ω
/foot
20 AWG
0.0204
Ω
/foot
2.5 mm
2
0.0136
Ω
/meter
1.5 mm
2
0.0228
Ω
/meter
1 mm
2
0.0340
Ω
/meter
0.75 mm
2
0.0460
Ω
/meter
0.5 mm
2
0.0680
Ω
/meter
CAUTION
