172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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6.7 Suppressing Sudden Change in Output (Output Change Rate Limiter)
Output change rate limiter may be used to suppress sudden change in output at
power on or at the time of set value change.
Description of function
The Output change rate limiter limits the variation of Manipulated output (MV) per
second. This function is suitable for an application in which a sudden MV change is
not acceptable.
Example: The Output change rate limiter is available.
The MV reaches 100% when the power is turned on to the controller and such a
sudden output change is not acceptable in the application.
A sudden output change occurs at the SV change and it is not acceptable in the
application.
The output changes at specific rates set by Output change rate limiter (up) even under
the situations where a sudden output change would occur without Output change rate
limiter function. There is also independent Output change rate limiter (down).
When the output change rate is set smaller, it will cause slow control response
and affect Derivative action.
When the Output change rate limiter is used, appropriate PID constants may not
be obtained by Autotuning
The Output change rate limiter is particularly available when a sudden MV change
may create uncontrollable situation cause a large current flow. Also, it is available
especially when current output or voltage output is used as control output.
Output change rate limiter may be also available in Manual mode (including
communication). Output change rate limiter also functions when output changes
suddenly due to manipulated manual output at input error.
When the instrument recovers from power failure in Hot start 1, the Output
change rate limiter starts from the value before the power failure.
The Output change rate limiter will be unavailable when control is stopped (at
STOP), when control action is an ON/OFF control or MC-(V)COS(R) Pressure
control operation.
Содержание SC-F71
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