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8.16 WATLOW Series 988 User’s Manual
General Software Features, Chapter 8
General Software
Ramp To Set Point
Requirements
This feature is standard on all units.
Overview
Ramp to set point enables the Series 988 to ramp the set point at a user-
defined rate. This allows the controller to start up a system or change
between set points at a rate that will not stress the product or system
components. The ramp rate is defined in degrees per minute. Ramp to set
point can be initiated at start up only, or at start up and also on any set
point changes.
When a ramp is initiated, the starting point for the ramp is the current
process value. If the ramp is initiated on start up, the Series 988 looks at
the process value upon power up, and uses that value as the starting
point for the ramp. If a set point change initiates the ramp to set point
function, the controller looks at the process value when the change is
made and uses that value as the starting point for the ramp. If the set
point is changed during a ramp, the process value at the time of the
change becomes the starting point for the new ramp.