Terminal Connections; Power Connection - Macurco RD-VRF Instrucciones De Usuario

3.3 Terminal Connections

3.3.1 RD-VRF-X-24 Low Voltage Models
Except for the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply
plug the modular connectors into the matching connectors on the back side of the detector.
3.3.1.1

Power Connection

Connect the RD-VRF to Class 2 power supply only. It is suggested to use a separate transformer for powering the unit
or units because of possible interferences from other devices on the same power supply. Connect the RD-VRF to the
control cables with terminal plugs. When making connections, make sure the power is off. There are two terminals
for Power: 12 to 24 VAC or 12 to 32 VDC. The connection can accommodate a wire size 12 to 22AWG. Refer to
Figure 3-4.
3.3.1.2 Relay Connections
Both relay terminals have normally open, common, and normally closed (NO, COM and NC) connections and can
accommodate a wire size 14 to 22 AWG. To install the wiring for the relays, strip the insulation of each wire back
approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the
wire cannot easily be pulled from the connector.
3.3.1.3 Modbus Connection
When using the Modbus connection, it should be done using a RS-485, 4 conductor, 22-24AWG, shielded twisted
pair cable.
Note: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as
there may be interference from the high voltages.
REV – 1.0
Figure 3-8 Front View Board Layout
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