34 Chapter 6 Electrical Installation
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
Unused conductors must be suitably terminated. Wiring must be in accordance with local, national and company
regulations. Exposed or bare conductors must be avoided.
The maximum permissible mA loop voltage is 32 VDC and the maximum current is 22 mA.
Note
Do not reverse the receiver power supply connections. This will not damage the unit, however, the unit will not operate.
RECEIVER
CONNECTIONS
4-20 mA Output
+24 Vdc
0 Vdc
RS-485A
RS-485B
RS-485D
Fault Relay COM
Fault Relay NO
Alarm 1 COM
Alarm 1 NO
Alarm 2 COM
Alarm 2 NO
CONTROL
CABINET
CONNECTIONS
Figure 21.Receiver Connections
6.2.2Power Consumption of Excel Components (Typical)
Receiver calculation = 1000 x 6.75 Ω / (Ω / km)
Typical cable resistance Maximum cable length
Cable
Ω / km Ω / mi Meters Feet
1.5 mm
2
(16 AWG) 12.7 20.4 531 1,742
2.0 mm
2
(14 AWG) 10.1 16.3 668 2,191
2.5 mm
2
(13 AWG) 8.0 12.9 844 2,769
AWG is nearest equivalent *example is for a nominal 24 VDC supply
Note
The figures given in the table above are typical ratings that may vary from cable to cable. Always measure your own cable and
device resistances and your power supplies to ensure accuracy in your calculations.
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