External Wiring - Mitsubishi Electric MELSEC Q Series User Manual

4 SETUP AND PROCEDURE BEFORE STARTING THE OPERATION

4.4.2 External wiring

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(1) For use of the Q64TCTT
Controlled
object
1: Please use shielded compensation conductors.
POINT
When the cold junction temperature compensation resistor is away from the end tip
of thermocouple (or the end tip of compensation conductor), the (ambient)
temperature difference may lead to a faulty temperature process value.
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Q64TCTT
L1
L2
L4
COM-
24VDC
1
CH1+
CH1-
CH2+
CH2-
1
CH4+
CH4-
Reference junction
Q64TCTT(BW)
Thermocouple
extension wire (OK)
Cable (NG)
A
Cold junction
temperature
compensation
resistor
(Ambient) temperature
B
difference
MELSEC-Q
Internal
circuit
Internal
circuit
Internal
circuit
Terminal block
A: Reference junction of the
thermocouple
B: Cold junction temperature
compensation resistor
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