wtw DIQ/S 182-PR, System Operating Manual

Page: 102 / 146

Relay outputs System 182
6 - 18 ba75503e07 04/2012
6.4.5 Frequency output
Function The characteristic of the frequency output is laid down in the Start
value , End value , Frequency (f) min. and Frequency (f) max. settings.
The fundamentals of the function are described in the introductory
chapter (see section 6.3.3).
In order to set up the Frequency output function for a relay output, the
relay output must be linked with a sensor (see section 6.2.1).
Settings
Characteristic curve If a value is entered for End value that is greater than the Start value ,
the output has a positive characteristic curve.
In order to obtain a negative characteristic curve, a value must be
entered for
End value that is smaller than the value for Start value .
Setting Selection/Values Explanation
Measured variable Main variable
Adjoining variable 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).
Start value within the
measuring range
(sensor-
dependent) Minimum spacing:
5 % of the
measuring range
End value
Frequency (f) min. 0 to 120 1/min Minimum spacing:
10 1/min
Frequency (f) max.
Frequency with error 0 to 120 1/min In case of system
errors or sensor
errors (see page 6-
25), the relay
switches with the
frequency
specified.
Action Open
Close Relay action