NOVA541
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Starting Auto tuning and stopping it
■ Starting
①
Check the control system, PV input and heater power.
② Check if 「AT」lamp = OFF, in RUN mode not in READY mode.
③ Check if 「MAN」lamp = OFF, in Auto mode.
④ Set the parameter AT ON.
■ Stopping
Auto tuning stops automatically. But by setting AT=OFF or setting Ready mode, AT process will
be interrupted. Changing to READY mode or MANUAL mode will stop the AT process.
Cautions
.
▪ AT can be done normally under controllable system condition (heater, sensor).
▪ AT can be started at RUN mode and when PV is in a normal range.
▪ At an abnormal situations, an Interruption of power or sensor burn-out during AT, AT will stop
without changing PID parameters.
▪ The number of limit cycle or time can be different depending on the control system.
▪ MV will be ON and OFF for several times for limit cycle operation during AT procedure.
▪ In a special control system, optimal PID value cannot be obtained with AT. At this time, a user
should adjust P, I, D value manually.