TEMON 4-C
Doc. N°
MO-0368-ING
Microener. - Copyright 2010
2.1
Date
01.12.2008
Rev.
0
Pag.
4
of
14
5. Connection of the Thermometer Sensors
For the connection of the thermometer sensor RTD Pt100 it’s necessary to follow the indication of the wiring
diagram of this manual: pay attention not to invert the position between the conductors with red insulator and the
conductor with white insulator. The probes type PT100 with 3 wires use a third wire to compensate the resistance
of the conductors. If the sensor has 2 wires (normally white and red) it’s necessary to short-circuit the terminals with
the red wires (1-2, 4-5, 7-8, 10-11).
To re
duce the external noises it’s necessary to use the following indication for the wires of measure of the Pt100:
to use probes with shielded wire connected at earth and wires twisted
to separate the wires of the probes from wires of power
to use wires with section higher than 0,5 mm
2
to use wires with conductor with tin or silver-plated
6. Output Relays
For the connection of the output contacts of relays it’s necessary to follow the indication in the diagram.
The ALARM and TRIP relays commute when the threshold set are to get over.
The FAULT relay is normally energized and it commute in presence of an anomaly on the Pt100 or on device.
During the normally functioning of the device the contact 38-39 will be open while the 39-40 will be closed.
The FAN relay is used to control the fun of cooler, in function of the threshold set of switch on and switch off.
