Unitronics EXF-RC15, Installation Manual

Page: 5 / 6

EXF-RC15 Installation Guide
Unitronics 5
Relay Outputs
Increasing Contact Life Span
To increase the life span of the relay
output contacts and protect the device
from potential damage by reverse EMF,
connect:

A clamping diode in parallel with each
inductive DC load

An RC snubber circuit in
parallel with each inductive AC
load
Power Supply
The model requires an external 24VDC power supply.

The power supply must include double insulation. Outputs must be rated as
SELV/PELV/Class 2/Limited Power.

Use separate wires to connect the functional
earth line (pin 3) and the 0V line (pin 2) to the
system earth ground.

Install an external circuit breaker. Guard against
short-circuiting in external wiring.

Double-check all wiring before turning on the
power supply.
 Do not connect either the ‘Neutral’ or ‘Line’ signal
of the 110/220VAC to device’s 0V pin.

In the event of voltage fluctuations or non-
conformity to voltage power supply specifications,
connect the device to a regulated power supply.
Earthing the model
To maximize system performance, avoid electromagnetic interference by:

Mounting the model on a metal panel.

Connect each common and ground connection directly to the earth ground of your system.
For ground wiring use the shortest and thickest possible wire.