172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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8.18 Suppressing Overshoot
Overshoot can be suppressed at PID control at the time of startup (power on, control
stop to start), Set value (SV) change, and external disturbances.
Overshoot during the transition from Ramp to Soak can be prevented, when the
Setting change rate limiter is used.
Description of function
Overshoot suppressing function may include Control response parameter, Proactive
intensity, Determination point of external disturbance and Bottom suppression function.
Control response parameter
A response speed level at changing Set value (SV) at PID control can be selected
from three levels (Slow, Medium and Fast) in the Control response parameter.
Select “Fast” to quicken the response of the controlled object to the change in
segment level and Set value (SV).
When the response speed level is “Fast”,
overshoot will occur.
To avoid overshoot, select “Slow.”
Fast
Selected when rise time needs to be shortened (operation needs to started
fast). However in this case, slight overshooting may not be avoided.
Medium
Middle between “Fast” and “Slow.” Overshooting when set to “Medium”
becomes less than that when set to “Fast.”
Slow
Selected when no overshooting is allowed. Used when material may be
deteriorated if the temperature becomes higher that the set value.
Proactive intensity, Determination point of external disturbance
Overshoot can be suppressed at startup (power on, control stop to start), Set value
(SV) change, and external disturbances. Overshoot during the transition from Ramp
to Soak can be prevented. The intensity ranges from 0 to 4 (5 scales).
Startup (power on, control stop to start), Set value (SV) change
Содержание SC-F71
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