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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.
● To use the heater disconnection detection function, the CT input channel assignment must be set. Since the CT1 is used
in the loop of CH1 in the above wiring example, set CH1(1) to CT1 CT input channel assignment setting (Un\G264).
● 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
Cooling
L1H
L1C
CH1+
CH1-
Filter
Filter
CH2+
CH2-
Controlled
object
*1
*1
*2
*2
*2
*2
Q64TCTTBWN
Current
sensor
(CT)
CT input circuit
CT1
CT1
CT8
CT8
CT2
CT2
Connector
Connector
Internal
circuit
Internal
circuit
Internal
circuit
L2H
COM-
*2
24VDC
Internal
circuit
L2C
Internal
circuit
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