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12.3
Control
Problem
Possible Cause
Solution
Even though
program control
is executed, the
control is advanced
and the program is
finished soon.
The step time of the performing
pattern number is set to 00:00.
Set the step time to a suitable value.
Step does not
progress.
Program control is suspended
(Hold function).
While program control is
suspended, the PV Display and
RUN indicator flash.
Press the RUN key.
Suspension of control will be cancelled, and
program control will resume.
The Wait function is working.
If the Wait function works, the
PV Display and PTN/STEP
Display flash.
Press the RUN key for approx. 1 second
to cancel the Wait function.
The Wait function will be cancelled,
and program control will continue.
PV does not rise or
fall.
Sensor is out of order.
Replace the sensor.
Check whether the sensor or
control output terminals are
securely mounted to the
instrument input terminals.
Ensure that the sensor or control output
terminals are mounted to the instrument
input terminals securely.
Check whether the wiring of
sensor or control output terminals
is correct.
Wire them correctly.
Control output
OUT1 or OUT2
remains in an ON
status.
OUT1 or OUT2 low limit value is set
to 100% or higher.
Set it to a suitable value.
The control output
OUT1 or OUT2
remains in an OFF
status.
OUT1 or OUT2 high limit value is
set to 0% or less.
Set it to a suitable value.
The PV Display
indicates
er20.
AT has not been completed even if
approx. 4 hours have elapsed
since AT started.
Manually set P, I, D and ARW values.