Xylem WTW DIQ/S 281, Руководство по эксплуатации

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Outputs DIQ/S 281
108
ba77244d01 08/2020
By activating or deactivating the I ntegral (
ti
) and D ifferential (
td)
controller part,
the following controller types can be configured:
Characteristic
curve of the
proportional
controller
For a pure P controller the correlation between the measured value and current
I on the controller output results in the following characteristic curve:
The proportional range
Xp
is limited by the measurement range of the linked
sensor. If a value is entered for the parameter
Xp
that is greater than zero, the
controller has a positive characteristic curve (example figure 6-17). To obtain a
positive characteristic curve, a negative value must be entered for
Xp
.
Application
example
 Regulation of the oxygen concentration
 Sensor: TriOxmatic 700 IQ (measuring range: 0 to 60 mg/l)
Regulator type td [s] ti [s]
P controller
0 0
PI controller
0 1 to 9999
PD controller
1 to 9999 0
PID controller
1 to 9999 1 to 9999
figure 6-17 Proportional controller (negative characteristic curve)
Control parameter Value
Nominal value
4 mg/l
Xp
10 % of the measuring range
or 6 mg/l