Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 165)

Publication 900-UM007D-EN-E - January 2011
Parameter Adjustments & Application Considerations 4-29
Executing the SP Ramp
Function to Limit the SP
Rate of Change SP Ramp
With the SP ramp function, the controller can limit the rate at which a change
in the set point will impact the control according to the user-defined SP ramp
value. The time interval in seconds/minutes which the set point is limited is
referred to as the SP ramp.
Figure 4.46
The maximum allowed rate of change during SP ramp is specified by the SP
Ramp Set Value and SP Ramp Time Unit parameters.
Note: When the SP Ramp Set Value is OFF (default), the SP ramp function is
disabled.
Changing the ramp set point can be monitored in the Set Point during SP
Ramp parameter (Operation function group). Use this parameter when
monitoring the SP ramp.
Operation of the SP ramp function is also the same during switching of the set
points by the Multi-SP parameter.
Change point
SP after change
SP before change
SP ramp
Time
SP
SP ramp value
Time unit of ramp rate (s/min.)
Table 4.U
Symbol Parameter: Function Group Description
ol-h
ol-l
sl-h
sl-l
sprt
spru
alsp
MV Upper-Limit: Adjustment function group
MV Lower-Limit: Adjustment function group
Set Point Upper-Limit: Initial Setting function group
Set Point Lower-Limit: Initial Setting function group
SP Ramp Set Value: Adjustment function group
SP Ramp Time Unit: Advanced Setting function group
Alarm SP Selection: Advanced Setting function group To limit the manipulated variable
To limit the manipulated variable
To limit the SP setting
To limit the SP setting
To limit the SP rate of change
Unit for setting the SP
Alarm SP selection