172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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10.2 Eliminating a Sudden Set Value Change (Setting Change Rate Limiter)
This function allows the Set value (SV) to change gradually, not rapidly or not at a
time, when the Set value (SV) is changed.
10.2.1 Limiting the set value (SV) change rate (Setting change rate limiter)
Description of function
This function is to allow the Set value (SV) to be automatically changed at specific
rates when a new Set value (SV).
Setting the Setting change rate limiter unit time parameter and the Setting change
rate limiter (up and down) will enable setting the changing rate (setting change rate
limiter/unit time) of the Setting change rate limiter (up or down).
[Application examples of Setting change rate limiter]
SV
Decrease gradually
at specific rate
SV
[After changing]
SV
[Before changing]
Changing the set value
Time
Decreasing the SV to a lower value
Increase gradually
at specific rate
Changing the set value
SV
[After changing]
SV
[Before changing]
Time
Increasing the SV to a higher value
SV
When the Setting change rate limiter is used, the Set value (SV) will also ramp
up or ramp down by the function at power-on and operation mode change from
STOP to RUN.
When the Set value (SV) is changed by the Memory area transfer function, the
Setting change rate limiter functions from the Set value (SV) before the change
(transfer) toward the set value after the change (transfer).
If the Autotuning (AT) function is activated while the Set value (SV) is ramping
up or ramping down by the Setting change rate limiter, AT will starts after the
Set value (SV) finishes ramp-up or ramp-down by the limiter, and the controller
is in PID control mode until AT starts.
When the value of Setting change rate limiter is changed during normal
operation, the ramp-up or ramp-down rate will be changed unless the SV
already has finished ramp-up or ramp-down by the function.
When Setting change rate limiter is a setting
other than “OFF: No function
(disabled)” and when the Event type is set to a SV monitor value, the Event re-
hold function by the Set value (SV) change is unavailable. However, the Event re-
hold function by the Set value (SV) change is available for events using a local SV
During the Remote mode, the Input 1_Setting change rate limiter will function to
Remote setting input value.
Input 2_Setting change rate limiter will be unavailable during Cascade control.
Summary of Contents for SC-F71
Page 17: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 16 ...
Page 18: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 17 Differential temperature control ...
Page 114: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 113 Setting procedure ...
Page 131: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 130 Setting procedure ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
Page 303: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 302 Setting procedure ...
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