Xylem WTW DIQ/S 281 Operating Manual page 85

DIQ/S 281
Output with one
relay
Output with two
relays
ba77244d01 08/2020
Proportional outputs can be used in the following way:
 Output with one relay:
An output range is defined with a Start value and an End value. No output
takes place above and below the output range (see page 85).
 Output with two relays:
An output range is defined for each relay with a Start value and an End value.
One relay outputs in the upper output range and a further relay in the lower
output range (see page 85).
Switching frequency f or
Pulse width v
100
90
10
0
1
figure 6-2 Output with one relay
Switching frequency f or
Pulse width v
100
90
10
0
1 Start value
Measured value with a minimum pulse width or switching frequency
2 End value
Measured value with a maximum pulse width or switching frequency
figure 6-3 Output with two relays
Proportional
band
Measured value
2
Proportional bands
Relay 1 and 2
1
2 1
2
Relay 1
Relay 2
Measured value
Outputs
85