VAT 651 Series - Tuning of Control Performance

INSTALLATION Series
651
50/99 Edition 2014-07-10 605451EC
4.5.3.4 Soft pump control algorithm
Parameter Command Request Data Type Values
RAMP TIME
Set
s:02D01c
s:02
FLOAT
c = 0.00…1 ’ 000 ’ 000.0
Default is: 0.00
Get i:02D01
i:02D01c
RAMP MODE
Set
s:02D02c
s:02
UINT
c = 0…1
0 = constant time
1 = constant slope
Default is: 0
Get i:02D02
i:02D02c
P-GAIN
Set
s:02D04c
s:02
FLOAT
c = 0.001…100
Default is: 0.1
Get i:02D04
i:02D04c
Explanation:
RAMP TIME
Pressure setpoint ramp time [s]
RAMP MODE
Mode = 0
Constant Time
The RAMP TIME is dependent on the adjusted parameter ramp time and is always the
same independent of the control deviation. That means the ramp time from the actual value
to the setpoint value is the adjusted parameter ramp time value.
Mode = 1
Constant Slope
The RAMP TIME is dependent on the adjusted parameter ramp time and is different
depending on the control deviation. The RAMP TIME is calculated corresponding to the
sensor full scale value (10V). Ramp time = 10 sec ; ramp time slope is SFS (10V) in 10
Seconds.
P-GAIN
The P-GAIN is the proportional factor of the fixed control algorithm.
To optimize soft pump algorithm, refer to chapter «Tuning of control performance».
4.6 Tuning of control performance
Tuning of pressure control performance with adaptive control, refer to chapter: 4.7.1 Tuning of
pressure control (adaptive)
Tuning of pressure control performance with PI control, refer to chapter: 4.7.2 Tuning of
pressure control performance with fixed PI control
Tuning of control pressure performance with Soft pump , refer to chapter: 4.7.3 Tuning of
pressure control (soft pump)