Power Connection - Macurco DVP-120C User Instructions

Macurco DVP-120C Manual
With the exception of 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 printed circuit board (PCB).
Note: It is recommended to always install with wires enclosed within the rigid metallic conduit.
The power and signal connections to the remotely mounted sensors should be size AWG18 (minimum) for short
runs. Refer to Table 3-2 for recommended wire gauges.
Do not bundle sensor power and/or signal connections with other AC power cables to prevent electrical
interference. If other AC power connections must be bundled with the DVP-120C sensor cables, the sensor
connections should be made with two twisted pairs of the appropriate gauge, with an overall foil and braid shield.
All shields should be terminated at the DVP-120C end of the cable only. A ground stud is provided.
The power connections to the MRS-485 and remote mounted sensors should be size AWG18 (minimum) for short
runs. Refer to Table 3-2a for recommended wire gauges. The power for the MRS-485 adapter is connected via a two-
terminal screw type connector, 12 to 24 VAC or 12 to 24 VDC and no polarity.
The MRS-485 adapter output is wired in the standard 2W-Modbus circuit definition with selectable built-in
terminating resistors at the ends of the RS-485 bus. It is recommended to always use twisted wires to reduce noise
and allow for reliable data communication over greater distances. For best performance use shielded 3-conductor
wire with one twisted pair providing a pair for signal (A & B), common (COM) and shield ground (SHD) connections.
Use at least 3-conductor wire with one twisted pair providing a pair for signal (A & B) and common (COM)
connections. The Macurco MRS-485 Modbus output is connected via a four-terminal screw type connector.
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 near the bottom left corner of the panel.

3.2.2 Power Connection

The main power cable should be routed into the bottom left conduit entry. Macurco recommends a minimum wire
size of AWG18 and the wire insulator must be rated for 140°F (60°C) service. The modular connector will accept wire
from 12 to 24 AWG. The safety ground wire should be secured to the ground stud at the bottom left of the cabinet
with the lock washer and nut supplied. Use a ring terminal for the ground connection. Refer to Table 3-1 for DVP-
120C power connections. The line and neutral wires should be stripped 1/4 in. (6.5 mm), insert the wire into the
wire cavity of the modular connector and tighten the screw clamp. Ensure that the wire cannot be easily pulled from
the connector. Plug the modular connector into AC~ on the PCB and ensure that it latches into the header properly.
REV – 1.0
Signal
Line (120/220/240/250 VAC)
Neutral
Ground
Table 3-1 Main Power Connection
[34-8708-4770-8 ]
Connector Pin Number
AC~ 3
AC~ 1
Ground Stud n/a
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