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5 Advanced Operations
E5@C Digital Temperature Controllers User’s Manual (H174)
5-6 Using the SP Ramp Function to Limit the SP Change Rate
5
5-6-1 SP Ramp
5-6 Using the SP Ramp Function to Limit
the SP Change Rate
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.
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
Precautions for Correct Use
To use the SP ramp function, the ST (self-tuning) parameter must be set to OFF (default: ON).
If the ST parameter is set to ON, the settings for the SP ramp function will not be displayed.
5-6-1 SP Ramp
Display
Parameter Description Level
sprt SP Ramp Set Value
To limit the SP rate of
change
Adjustment Level
sprl
SP Ramp Fall Value
To limit the SP rate of
change
Adjustment Level
spru SP Ramp Time Unit Unit for setting the SP
Advanced Function
Setting Level
alsp
Alarm SP Selection Alarm SP selection
Advanced Function
Setting Level
SP
SP ramp
SP after change
SP before change
Point of change
Time
SP ramp set value
SP ramp time unit (s/min/h)
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