Spectrum Controls 1756sc-IF8u User Manual
Page 32
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Wiring
Thermocouples to
the IF8u Module
One end of thermocouple to IN+
Other end of thermocouple to IN-
Thermocouple Inputs
EXC+
IN+
IN-
iRTN
CJC Sensors
TC +
TC -
CABLE SHIELD
CJC+
CJC-
White (With Potted Sensor)
White (No Sensor)
For cold junction compensation be sure the two supplied thermistors are
connected. One should be connected between CJC0-IN+ and CJC0-IN-
and the other should be connected between CJC1-IN+ and CJC1-IN-.
Also be sure configuration tag “.CJDisable” is set to zero to perform cold
junction compensation for thermocouple inputs
Cold Junction Compensation (CJC)
CAUTION
POSSIBLE EQUIPMENT OPERATION
Both CJCs are critical to ensure accurate thermocouple input
readings at each channel.
Failure to observe this precaution can cause unintended
equipment operation and damage.