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Using the SP Ramp Function to Limit the SP Change Rate Section 4-7

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.

Restrictions during

SP Ramp Operation

• Execution of auto-tuning starts after the end of the SP ramp.

• When control is stopped or an error occurs, the SP ramp function is dis-

abled.

Alarms during SP

Ramp Operation

The operation of alarms during SP ramp operation depends on whether

alarms are set to be based on the ramp set point or the target set point (refer

to the following diagrams). The set point to be used is set in the Alarm SP

Selection parameter. (Refer to page 225.)

PV < SP

SP ramp

Set point

Time Time

Power ON Power ON

PV > SP

SP ramp

Same rate

of change

Set point

Alarm SP Selection = Ramp SP (Alarm Type: 1 (Upper/Lower Limits))

Alarm SP Selection = Target SP (Alarm Type: 1 (Upper/Lower Limits))

Temperature

Time

Alarm output ON

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