VAT 642 Series Installation, Operating, & Maintenance Instructions page 44

Pressure control algorithem
4.6.2.2 Adaptive control algorithm (downstream)
Parameter
SENSOR
DELAY
RAMP TIME
RAMP MODE
GAIN
FACTOR
Explanation:
SENSOR DELAY
Sensor response time [s]
The SENSOR DELAY is a control parameter to compensate delays during the pressure detection. Pipes
and orifices for sensor attachment can cause delays in response time and could impact badly the
pressure control stability. By adapting this parameter to the approximate delay time stability problems can
be reduced. But control response time will be slowed down by this measure.
RAMP TIME
Pressure setpoint ramp time [s]
RAMP MODE
Mode = 0
Cocnstant Time
Mode = 1
Constant Slope
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INSTALLATION
•
Local operation only:
o With CPA direct setup, see chapter: With CPA 3.0 direct setup (standard).
o With CPA, go to «Tools» > «Terminal» and send setup commands according to
application needs. See next tables.
Command
s:02A00c
Set
Get i:02A00
Set s:02A01c
Get i:02A01
Set s:02A02c
Get i:02A02
s:02A04c
Set
Get i:02A04
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.
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.
Edition 2017-11-24
Request Data Type
s:02
FLOAT
i:02A00c
s:02
FLOAT
i:02A01c
s:02
UINT
i:02A02c
s:02
FLOAT
i:02A04c
Series 642
Values
c = 0.00...1.00
Default is: 0.00 s
c = 0.00...1 000 000.0
' '
Default is: 0.00 s
c = 0 or 1
0 = constant time
1 = constant slope
Default is: 0
c = 0.0001...7.5
Default is: 1.0
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