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CHAPTER 5 SETTINGS AND THE PROCEDURE BEFORE OPERATION
5
5.4 Wiring
5.4.2 External wiring
(b) In the heating-cooling control
*1 Use the shielded compensation lead wire.
*2 Use the shielded cable.
Use the compensation lead wire for the cable of thermocouple. If the compensation lead wire is not used, and when the cold
junction temperature compensation resistor is away from the end tip of thermocouple, the (ambient) temperature difference
may lead to a faulty temperature process value (PV).
Heating
L1H
L1C
CH1+
CH1-
Filter
Filter
CH2+
CH2-
Controlled
object
*1
*1
*2
*2
*2
Q64TCTTN
Internal
circuit
Internal
circuit
Internal
circuit
L2H
COM-
*2
24VDC
Internal
circuit
L2C
Internal
circuit
Cooling
Q64TCTT(BW)N
Reference junction
Thermocouple extension wire (OK)
Shielded cable (NG)
Cold junction
temperature
compensation
resistor
(Ambient) temperature difference
Terminal block
A: Reference junction of the
thermocouple
B: Cold junction temperature
compensation resistor
A
B