6. PARAMETER SETTING MODE
IMR01N12-E7
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Setting change rate limiter (down) (1.SVrd, 2.SVrd)
This function is to allow the Set value (SV) to be automatically changed at specific rates when a new Set value
(SV). SVrd is used when the SV is changed to a lower SV.
Data range:
OFF (Unused)
0.1 to Input span/unit time
(Varies with the setting of the Decimal point position)
Factory set value:
Input 1_setting change rate limiter (down) (1.SVrd): OFF
Input 2_setting change rate limiter (down) (2.SVrd): OFF
The unit time can be changed by the Setting change rate limiter unit time in the Engineering mode
(P. 97). (Factory set value: 60 seconds)
Setting change rate limiter:
Application examples of setting change rate limiter:
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 the rate of Setting change limiter is set to any value other than “OFF (Unused),” the Event re-hold
action to be taken by a Set value (SV) change becomes invalid.
Increasing the SV to a higher value
Increase gradually
at specific rate
Changing the set value
SV
SV
[After changing]
SV
[Before changing]
Time
Decreasing the SV to a lower value
Decrease gradually
at specific rate
Changing the set value
SV
SV
[After changing]
SV
[Before changing]
Time
