31Chapter 6 Electrical Installation
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
6 Electrical Installation
Remove power from the transmitter and receiver before performing any electrical installation or maintenance.
6.1Receiver Electrical Installation
6.1.1Receiver Power Supply Requirements
The receiver requires a voltage supply of 1832 Vdc (nominal 24 Vdc). Peak current for receiver is max. 0.6 A. Inrush current
for receiver is 0.3 A for less than 20 ms.
Average (RMS) power consumption values:
Ambient Operating
Temperature
Power
consumption (W)
55°C (67°F) to 30°C (22°F) 7.4
30°C (22°F) to +30°C (+86°F) 4.8
above +30°C (+86°F) 3.0
Cold Start / Heat-up power consumption values:
Ambient Operating
Temperature
Power
consumption (W)
below 30 °C (22 °F) 15
above 30°C (22°F) 10
The heat-up period lasts approx. 20 min. At lower ambient temperature the internal heater is active and power consumption
may reach up to 15 W.
Ensure that the minimum required supply voltage 18 VDC is present at the receiver, taking into account the voltage drop
due to cable resistance.
Note
Make allowance for the insertion loss resistance.
The maximum loop resistance in the field cable is calculated as follows:
As an example, V
detector min
= 18 V; P
max
= 10 W or 15 W (dependent on environmental conditions) V
controller
will depend upon
the connected power supply or control system. Consult the manual of the given equipment for this information.
The receiver 24 V power supply and 420 mA current loop power supply must be of an isolating type (galvanic isolation
from mains, providing basic insulation) but does not need to be a Class II (SELV) power supply.
If mains voltage is connected to more than one relay, all relays must be connected to the same phase of the mains network.
Using different phases is not allowed.
Temperature rating of the cable connected to the terminal shall be suitable with respect to the installation environment.
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