Wiring - Omron CQM1H series Operation Manual

Wiring

Autotuning (AT)
2-5

Wiring

Wiring
Units for Thermocouples
CQM1-TC201
(4 loops, NPN
outputs)
Loop 1
Loop 2
Cold junction
compensator
Loop 3
Loop 4
Output 1
Output 2
Output 3
Output 4
+24 VDC
(from external
power supply)
PID calculations using the limit cycle method are performed when autotuning is
executed. Parameters cannot be written for loops that are currently being auto-
tuned.
Set point
AT executed for ON/OFF control
• The limit cycle method causes hunting using ON/OFF control near the set point
to measure the hunting cycle and amplitude and uses the results to make cal-
culations for PID control.
• Be sure to change the START AT command in the output word after the START
AT command has been sent and received. If the START AT command is left set
in the output word, autotuning will be executed again as soon as it is com-
pleted.
CQM1-TC202
(4 loops, PNP
outputs)
Loop 1
Loop 2
Cold junction
compensator
Loop 3
Loop 4
Output 1
Output 2
Output 3
Output 4
+24 VDC
(from external
power supply)
• Do not touch or remove the cold junction compensator.
• The sensor must be of the type set on the input type DIP switch.
Hunting cycle
Amplitude
CQM1-TC203
(2 loops, heater burnout
alarm NPN outputs)
Loop 1
Loop 2
Cold junction
compensator
Output 1
Output 2
+24 VDC
(from external
power supply)
Section 2-5
Calculated
PID control
AT completed (ampli-
tude and hunting cycle
measurements com-
pleted)
CQM1-TC204
(2 loops, heater burnout
alarm PNP outputs)
Loop 1
Loop 2
Cold junction
compensator
Output 1
Output 2
+24 VDC
(from external
power supply)
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