Vestfrost R-138, User Manual

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20 Vestfrostsolutions.com
EN
Your device is equipped with a remote alarm
connection to send alarm signals to a building
management system, a monitoring unit, visual
or acoustical warning device etc.
The alarm output is managed freely by the
built in controller of the unit.
Alarm criteria may be too low temperature,
too high temperature, power failure, open
door or similar.
The alarm output is an electrical floating
output (dry contact) which acts like a ON/OFF
switch.
A SPDT (single pole, dual throw) relay with
maximum switch rating of 250V 3A is main-
tained by the build-in XW737K controller unit.
The relay terminals are explained this way:
COM: COMMON terminal
NO: NORMALLY OPEN terminal.
Connects to COM when the alarm is activated
NC: NORMALLY CLOSED terminal.
Disconnects from COM when the alarm is
activated
An alarm interface cable of maximum
30 meters can be attached without the use of
tools to the 3-pole alarm clamp connector.
Wire thickness must be within 0.5mm2 to
2.5mm2 and fitted with core crimp terminals.
Internal XW737K controller with
build-in alarm relay
Remote alarm function
3. COM
2. NO
1. NC