Using The Sp Ramp Function To Limit The Sp Change Rate; Sp Ramp - Omron E5CC User Manual

5-6 Using the SP Ramp Function to Limit
the SP Change Rate
5-6-1

SP Ramp

The SP ramp function is used to restrict the width of changes in the set point as a rate of change. When
the SP ramp function is enabled and the change width exceeds the specified rate of change, an area
where the set point is restricted will be created, as shown in the following diagram.
During the SP ramp, control will be performed not for the specified set point but rather for the set point
restricted by the rate of change set for the SP ramp function.
SP
SP after change
SP before change
The rate of change during an SP ramp is specified using the SP Ramp Set Value, SP Ramp Fall Value,
and SP Ramp Time Unit parameters. The SP Ramp Set Value parameter is set to OFF by default and
the SP Ramp Fall Value parameter is set to SAME by default, i.e., the SP ramp function is disabled.
Changes in the ramp set point can be monitored in the Set Point During SP Ramp parameter (Opera-
tion Level). Use this parameter when monitoring SP ramp operation.
The SP ramp function operates in the same way when switching the set point using the multi-SP func-
tion.
Parameters
Display
sprt
sprl 000
spru
alsp
000
Operation at Startup
If the SP ramp function is enabled when the Controller is turned ON or when switching from STOP to
RUN mode, the process value reaches the set point using the SP ramp function in the same way as
when the set point is changed. In this case, operation is carried out with the process value treated as
the set point before the change was made. The direction of the SP ramp changes according to the
relationship between the process value and the set point.
E5@C Digital Temperature Controllers User's Manual (H174)
SP ramp
SP ramp set value
SP ramp time unit (s/min/h)
Point of change
Parameter
SP Ramp Set Value
SP Ramp Fall Value
SP Ramp Time Unit
Alarm SP Selection
Time
Description
To limit the SP rate of
change
To limit the SP rate of
change
Unit for setting the SP
Alarm SP selection
5 Advanced Operations
Level
Adjustment Level
Adjustment Level
Advanced Function
Setting Level
Advanced Function
Setting Level
5 - 17
5