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However, if PV slope and delay time cannot be measured normally for P, I, D calculation, the error
code below will be indicated in the PV display, and automatically ‘AT on startup’ will stop.
If an error has occurred, P, I, D and ARW values revert to the previous value at which ‘AT on startup’
is performed.
Error Code
Error Contents
PV slope and delay time cannot be measured normally for P, I, D calculation.
To cancel the error code, press the
key.
If ‘AT on startup’ is performed or stopped, the error code will be cancelled.
[Conditions of Cancelling ‘AT on startup’]
• When Control output OFF is enabled
• When input is burnt out
• When deviation between SV and PV is within 2
or within 2% of proportional band (even though
the set integral time has exceeded when the control is stable)
(Example) Performing Usual AT
Power ON
RUN mode
PV/SV Display
+
Sub setting mode
AT/Auto-reset Perform/Cancel [37]
or
Select AT Perform.
RUN mode
PV/SV Display
Now, selection is complete.
The AT indicator flashes while AT is performing.
After AT is complete, the AT indicator goes off, and control is performed using PID constants
calculated by the AT.
If AT does not finish after 4 hours, the error code below will be indicated in the PV Display, and
AT will automatically stop.
Error Code
Error Contents
If AT or ‘AT on startup’ does not finish after 4 hours.
To cancel the error code, press the
key.
The error code will be cancelled in the following cases.
• When Control output OFF function is enabled
• When Program control is stopped and the unit reverts to the Standby (Program control waiting) mode.
• When ‘Control output OFF function’ or ‘Auto/Manual control’ is selected in [OUT/OFF key function].
• When ‘AT/AT on startup/Auto-reset Cancel’ is selected in [AT/Auto-reset Perform/Cancel].
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]