Omron E5ZN - SP Ramp Function: Limiting SP Change Rate; SP Ramp

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SP Ramp Function: Limiting SP Change Rate Section 4-7
4-7 SP Ramp Function: Limiting SP Change Rate
4-7-1 SP Ramp
The SP ramp function controls the rate of change of the SP. If a change larger
than the rate of change is specified when the SP ramp function has been
enable, changes in the SP will be limited as shown below. Thus, when
changes are made to the SP with the SP ramp function enabled, control is
performed according to the rate of change rather than the target value.
The change rate during SP ramp is specified in the “SP ramp set value”
parameter. The “SP ramp set value” default is 0, i.e., the SP ramp function is
disabled.
The SP ramp can be monitored in the “SP during SP ramp” parameter.
Operation at Start When the power is turned ON, operation is performed with the PV treated as
the SP before the change was made.
The direction of the SP ramp changes according to the relationship between
the PV and the SP, as shown in the following diagram.
Restrictions during SP
Ramp Operation
• Autotuning starts after the SP ramp function ends.
• When control is stopped or an error occurs, the SP ramp function is dis-
abled.
SP
SP ramp
SP after change
SP before change
SP ramp set value
Time unit of SP ramp rate (min.)
Time
Change point
TimeTime
SP SP
PV
PV
PV < SP PV > SP
SP ramp SP ramp
Power ON Power ON
SP
SP
Same change rate