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PRESYS
| Instruments
The wiring of a type of sensor in input 1, will not restrict the simultaneous use of
any other sensor, whether or not of the same type, in input 2.
To prevent noise induction from occurring in the sensor when connecting wire to
the I/O terminal use twisted pair cable and run the sensor connection wire through a
metallic tube or use a shielded cable. Be sure to connect only one shielded wire end to
the negative I/O board terminal, or to the sensor ground, as outlined in the following
items.
WARNING: THE GROUNDING OF THE TWO SHIELDED WIRE ENDS MAY CAUSE
DISTURBANCE TO THE CONTROLLERS.
2.3.1 - Thermocouple Connection
Whenever using just one thermocouple, the user should preferably connect it to
input 1 of the controllers, in order to obtain a greater accuracy in temperature
measurements, since the cold junction sensor is solidly attached to the I/O terminal and
closer to input 1.
Apply thermal paste from the thermocouple I/O terminals to the cold junction
sensor in order to reduce the cold junction compensation error.
Connect the thermocouple to terminals 2(+) and 3(-) to use input 1 or to terminals
5(+) and 6(-) to use input 2 as shown in figure 4.
Use appropriate compensation cables of the same construction material as the
thermocouple to connect the thermocouple to the controller I/O terminals. Check that the
correct thermocouple polarity is the same as that of the corresponding terminals.
Grounded
Note 1
-
+
-
+
6 5
4
3
2
1
Channel 2
Channel 1
Note1: Keep shielded wire disconnected at this end.
Fig. 4 - Thermocouple Connection
DCY-2050 and DCY-2051
Ungrounded
Thermocouple
Twisted pair or
shielded wire
-
6 5
Channel 2
Note 1
+
-
+
4
3
2
1
Channel 1
Installation
Page 9
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