8. PARAMETER DESCRIPTION
IMR02C15-E4
8-19
Continued from the previous page.
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). SVRU is used when the SV is changed to a higher SV. SVRd is used when the SV is
changed to a lower SV.
[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 SV will also ramp up or ramp down by the
function at power-on and operation mode change from STOP to RUN.
If the Autotuning (AT) function is activated while the SV is ramping up or ramping down by
the Setting change rate limiter, AT will starts after the 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.
If control is stopped during the Setting change rate limiter, the value at that point is
considered the Set value (SV). Setting change rate limiter is canceled.
If the Setting change rate limiter is set to any value other than “0 (Unused),” the event re-hold
action to be taken by a Set value (SV) change becomes invalid.
Setting change rate limiter is available during the Manual mode (MAN).
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