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Using the SP Ramp Function (to Limit the SP Change Rate) Section 4-7
4-7 Using the SP Ramp Function (to Limit the SP Change
Rate)
4-7-1 SP Ramp
With the SP ramp function, the controller operates according to the value (set
point during SP ramp) limited by a change rate. The interval in which the set
point during SP ramp is limited is referred to as the “SP ramp”.
The change rate during SP ramp is specified by the “SP ramp set value”
parameter. The “SP ramp set value” default is “OFF”, and the SP ramp func-
tion is disabled.
Changing of the ramp set point can be monitored in the “set point during SP
ramp” parameter (operation level). Use this parameter during monitoring of
the SP ramp.
Operation is the same also during switching of the set points by multi-SP.
Change point
SP after change
SP before change
SP ramp
SP ramp set value
Time unit of ramp rate (min.)
Time
SP
Symbol Parameters: Level Description
ol-h MV upper limit :
Advanced function setting level
For limiting manipulated variable
ol-l MV lower limit:
Advanced function setting level
For limiting manipulated variable
sl-h Set point upper limit:
Initial setting level
For limiting SP setting
sl-l Set point lower limit:
Initial setting level
For limiting SP setting
sprt SP ramp set value:
Advanced function setting level
For limiting SP change rate
Parameters
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