Relay Outputs; Increasing Contact Life Span; Power Supply; Earthing The Model - Unitronics EXF-RC15 Installation Manual

EXF-RC15 Installation Guide

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.
Unitronics

Relay Outputs

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