OPERATION
Series 613
102/149
Edition 12.08.2022
984360EC
Setpoint Ramp adjustment
Setpoint Ramp effects: Undershoot of pressure, Response time
Note: The ramp is described in detail in capital Pressure Ramp.
This parameter defines the time that is used to decrease / raise pressure between 2 setpoints.
Especially in pressure decrease situations at low flows pressure response can be improved much by
adapting setpoint ramp time.
Pressure chart
Choose the applicable formula depending on units you are familiar with.
t
-
Setpoint Ramp
P
SFS
-
Pressure at Sensor full scale
P
START
-
Pressure at start of controlling a pressure step
P
END
-
Certain pressure, which should be regulated
Adjustment procedure:
1. Start with optimal Gain Factor and sensor delay time according to preceding tuning steps.
2. Control a typical pressure / flow situation.
3. Control a lower pressure.
4. Repeat from step 2 with longer setpoint ramps until best response is achieved.
5. Verify pressure control response for a setpoint raise situation.
In case a long ramp time is required to get optimal performance for pressure
decrease situations it may be of advantage to apply different settings for decrease /
raise control situations.
P
START
P
SFS
t
P
END
Without setpoint ramp optimizing
With setpoint ramp optimizing
