172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
214
AT/ST status monitor
Displays the execution status of Startup tuning (ST).
Displays “2” during Startup tuning (ST).
Displays “0” when Startup tuning (ST) is completed.
When Startup tuning (ST) is aborted, the display shows -1 up to -4 depending on
the reason of the abort.
-1: Aborted. Setting changed.
When Startup tuning (ST) is disabled (
oFF
: ST unused).
When the PV bias, PV ratio, or PV digital filter is changed.
When the Output limiter high [heat-side] or low [heat-side] is changed.
When the instrument is switched to STOP by RUN/STOP transfer.
When the instrument is switched to Manual mode using Auto/Manual transfer.
When the instrument is switched to Remote mode using Remote/Local
transfer.
When the setting of the Level PID action selection is “2: Switching by the
Measured value (PV).”
-2: Aborted. Abnormal input.
When the Measured value (PV) has entered the Input error range.
[Input error range: Input error determination point high
Measured value
(PV), Input error determination point low
Measured value (PV)]
-3: Aborted. Timeout.
When Startup tuning (ST) will not end approximately 100 minutes after it
has been started.
-4: Aborted. Abnormal calculated values.
When the input was switched by Control with PV select.
Startup tuning (ST) internal error, etc.
Caution for using Startup tuning (ST)
For Startup tuning (ST) at power ON or transfer from STOP to RUN, always set the
heater power to ON simultaneously with the start of tuning or before the start of
tuning.
Start Startup tuning (ST) in the state in which the temperature differential of the
Measured value (PV) and Set value (SV) at the start of Startup tuning (ST) is twice
the Proportional band, or greater.
If in Heating/Cooling PID control, activate Startup tuning (ST) function under the
condition of “Set value (SV) > Measured value (PV).” Only the PID values on the
heat-side are automatically calculated but no PID values on the cool-side are
changed. The PID values on the cooling side can be obtained by Autotuning (AT).
When the manipulated output value may be limited by the Output limiter setting,
the optimum PID values may not be calculated by Startup tuning (ST).
When setting the Output change rate limiter, the optimum PID values may not be
computed by Startup tuning (ST).
When setting the Soft start/Setting change rate limiter, the optimum PID values are
not obtained even when Startup tuning (ST) is executed at Set value (SV) change.
When Startup tuning (ST) is started at power on, priority is given to Startup tuning
(ST) and the Proactive function will not start.
Summary of Contents for SC-F71
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Page 18: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 17 Differential temperature control ...
Page 114: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 113 Setting procedure ...
Page 131: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 130 Setting procedure ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
Page 303: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 302 Setting procedure ...
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Page 347: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 346 Operating procedure ...
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