Xylem DIQ/S 281 Operating Manual page 101

DIQ/S 281
Characteristic
curves
ba76226e02
switched more often or less often.
Relay
t = 0.3 s
On
On
Off
T
figure 6-5 Relay output of frequency output
While the selected switching duration (t
stant, the switching frequency at which the relay switches changes
depending on the measured value.
 If the measured value is at the end of the proportional range (
value
), the switching frequency is higher.
 If the measured value is at the beginning of the proportional range
Start value
(
Through the selection of the
can be operated with a positive or negative characteristic curve.
 Positive characteristic curve:
End value
Select the
The turn-on duration or frequency increases with an increasing measured
value (see page 103).
 Negative characteristic curve:
End value
Select the
The turn-on duration or frequency decreases with an increasing measured
value (see page 104).
The maximum values for the pulse width or switching frequency are assigned to
End value
the value and the minimum values for turn-on duration or frequency
are assigned to the
03/2023
Time [s]
), the switching frequency is low.
Start value
to be greater than the
to be smaller than the
Start value
value.
= 0.3 s) always remains con-
on
End value
and , the proportional output
Start value
.
Start value
.
Outputs
End
101