VAT 642 Series - Page 79

Series 642 INSTALLATION
742280ED Edition 2017-11-24 79/
119
4.8.5.4 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 control algorithm, refer to chapter «Tuning of control
performance».