Xylem WTW DIQ/S 281 Operating Manual page 99

DIQ/S 281
Settings
Characteristic
curve
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the function are described in the introductory chapter (see section 6.2.3).
In order to set up the Frequency controller function for a relay output, the relay
output must be linked with a sensor (see section 6.4).
Setting
Measured variable
Start value
End value
Frequency (f) min.
Frequency (f) max.
Frequency with error
Action
If a value for End value that is greater than the Start value is entered, the output
has a positive characteristic curve.
In order to obtain a negative characteristic curve, a value for End value must be
entered that is smaller than the value for Start value.
08/2020
Selection/Values
Main variable
Adjoining variable
within the
measuring range
(sensor-
dependent)
0 to 120 1/min
0 to 120 1/min
Open
Close
Explanation
Main variable designates the
actual measured parameter
of the sensor (e.g. pH,
oxygen, etc.).
Adjoining variable
designates an additional
measured parameter (e.g.
temperature).
Minimum spacing:
5 % of the measuring range
Minimum spacing:
10 1/min
In case of system errors or
sensor errors (see
page 112), the relay
switches with the frequency
specified.
Relay action (see
section 6.6.1)
Outputs
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