70
Using the SP Ramp Function (to Limit the SP Change Rate) Section 4-7
Operation at start If the SP ramp function is enabled when the E5AZ/E5EZ is turned ON, and
when “run” is switched to from “stop,” the process value may reach the set
point after SP ramp in the same way as when the set point is changed. In this
case, operation is carried out with the process value regarded 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.
Restrictions during SP
ramp operation
• Execution of auto-tuning starts after the end of SP ramp.
• When control is stopped or an error occurs, the SP ramp function is dis-
abled.
Time
PV < SP
Set point
SP ramp
Power ON
Time
PV > SP
SP ramp
Set point
Power ON
Same
change rate
SP SP
PV
PV
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