8. ENGINEERING MODE
IMR01N12-E7
91
Continued from the previous page.
[Example]
The Output change rate limiter is effective.
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).
If 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, you may not be able to obtain appropriate PID constants
by Autotuning.
The Output change rate limiter is particularly effective when a sudden MV change may create
uncontrollable situation cause a large current flow. Also, it is very effective current output or voltage
output is used as control output.
Output change rate limiter (down) (1. ord, 2. ord)
Use to set the Output change rate limiter (down).
Data range:
0.0 to 1000.0 %/second of manipulated output
0.0: Unused
Factory set value:
Input 1_output change rate limiter (down) (1. ord): 0.0
Input 2_output change rate limiter (down) (2. ord): 0.0
Related parameters:
Output change rate limiter (up) (P. 90), Output limiter high (P. 92),
Output limiter low (P. 92)
Description of function:
Refer to
Output change rate limiter (up)
.
Output limiter high
100 %
Sudden change in the output at power-up, set value
change or by disturbance
Manipulated output (MV)
Sudden
variation of
output
When the output change rate limiter is disabled
MV
MV
0.0 to
1000.0 %
of manipulated
output
1 second
Set the amount of increase given to the
operation output in the percentage of
manipulated output for each second.
Output limiter low
0 %
Manipulated output (MV)
