Main Power Connection - Macurco DVP-120 User Instructions

2.2 General Wiring Information
High voltage terminals (120/240 VAC) are located within the DVP-120, presenting a hazard to service technicians. Only qualified technicians should
open the DVP-120 case and service the internal circuits. Ensure power is removed from the DVP-120 prior to servicing the unit.
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).
DVP-120
The power and signal connections to the remote mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 2-2
for recommended wire gauges. Four conductor cables may be used in all cases since the DVP-120 employs DC power for remote
sensors to help prevent electrical noise from interfering with the sensor output signal.
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-120 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-120 end of the cable only. A
ground stud is provided near the bottom left corner of the panel.
DVP-120M
The power connections to the remote mounted sensors and MRS-485 should be size AWG18 (minimum) for short runs. Refer to Table
2-2 for recommended wire gauges. The Macurco MRS-485 output is connected via a four terminal screw type connector. The MRS-485
adapter is wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485
bus. 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. 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.
2.3

Main 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 2-1 for DVP-120 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.
Figure 2-2 Typical Layout
Signal
Line (120/220/240/250 VAC)
Neutral
Ground
Table 2-1 Main Power Connections
! WARNING
Connector
AC~
AC~
Ground Stud
7
Pin Number
3
1
n/a