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(9) Precautions
• Before starting the temperature control using the temperature control module, 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.
Temperature process value (PV)
Set value (SV)
Control start
• 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.
Temperature control for an injection mold, temperature control for a hot plate for a semiconductor
Ex.
manufacturing equipment
192
Original response
Heater powered on
Response of when a heater is powered on
after the temperature control module starts
temperature control
Time
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Table of Contents
Troubleshooting
