Dover Civacon ROM III - Wiring Instructions; The Wire; Power

9393PrincetonGlendaleRoad
Hamilton,Ohio45011
Revision1.2ROMIII“‐L”&“‐LIQ”Installation&OperationManualPageNo.10of15
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7. Wiring Instructions
7.1 The Wire
All wiring entering the monitor must enter through the appropriate access openings
shown in Figure 1. Use weather tight strain reliefs or liquid-tight fittings to keep out
external moisture. The use of weather tight strain reliefs with the sensor and socket
housings is also imperative for a moisture resistant system. We require the use of a
high quality stranded and tinned copper wire with a minimum thickness of 20 gage
and min. temperature wire insulation greater than 70°C for all electrical connections
to the monitor. Trim about ¼" of the insulation off the end of each wire that will be
connected to the terminal strips of the monitor. Insert the trimmed wire into its
appropriate slot on the terminal strip and tighten the screw on top of that slot.
Ensure that NO strands of wire have separated from the connection that could cause
a potential short with an adjacent terminal. Due to the vibrations that can occur on a
trailer, it is extremely important to double check all wiring connections for good
mechanical integrity. The proper color code of the wires will save time and money on
the installation and on any troubleshooting, which may be required in the future.
CIVACON Model 2300 cable (Part # 97701) is a seven (7) conductor or Model 7215-
7215 (Part # 97702) is a ten (10) conductor color coded cable which is highly
recommended for use with the installation of CIVACON ROM III overfill prevention
equipment. CIVACON also makes a Model 2100 cable (Part # 97750) that is a five
(5) conductor color coded cable which may be used with the socket installations.
NOTE: The proper tightening torque value for each electrical connector screw (per
the manufacturer’s specifications) is 4.45 to 5.30 in- lbs. (0.05 to 0.06 N-m). Please
observe these values when tightening of wires into each connection terminal on
ROMIII
7.2 Power
Do not apply power to the monitor without reading this manual and thoroughly
checking all connections. Measure the truck / trailer system voltage. The monitor is
designed to operate from 9 to 30 Volts DC, negative ground systems, supplied by a
battery. If your voltage measurement is not within this range, contact CIVACON
before installing the monitor. Power from battery chargers or other pulsed power
supplies may permanently damage the monitor. If the power wires pass through a
Class I, Division 2, Group D area, the wire type must be suitable for this use. The
monitor's power supply circuit should contain a switch and an inline fuse with a
maximum current rating of 1/2 Amp. It could be located in the nose box, and an
inline switch located in the truck cab so that the overfill system can be turned off
when the truck is out of service. This may also be accomplished with an appropriate
SAFETY FIRST!! POWER MUST BE OFF WHEN INSTALLING OR REMOVING POWER
LEADS TO THE MONITOR. THE WIRES FOR THE POWER FROM THE BATTERY
MUST BE KEPT SEPARATE FROM THE SENSOR AND SOCKET WIRING! THEY
CANNOT BE RUN TOGETHER IN THE SAME CABLE! This is important to maintain
safe current levels in the intrinsically safe sensors, auxiliary switches, and socket
wiring.