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(9) Precautions
• Before starting the temperature control using the Q64TCN, power on a controlled object such as a heater. If
the temperature control is started with a heater powered off, PID constants are calculated based on a
response that differs from the original characteristics using self-tuning.
• Do not use the self-tuning function for controlled objects where a great disturbance (uncontrollable
disturbance) occurs periodically. Doing so may cause improper PID constants to be determined by self-
tuning. If the function is used for such objects, improper PID constants are set and the response for the set
value (SV) change or disturbance becomes slow.
Ex.
Temperature control for an injection mold, temperature control for a hot plate for a semiconductor
manufacturing equipment
Temperature process value (PV)
Time
Set value (SV)
Control start
Heater powered ON
Original response
Response of when a heater is powered on
after the Q64TCN starts temperature control