wtw TresCon UNO A111, Operating Manual

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Operation TresCon UNO
5 - 30 ba43134e08 05/2017
Regulation with 1 relay
Regulation with 2 relays
Pulse-width controller The regulation of the pulse width is used, e.g. for controlling valves.
Pulse-width regulation changes the duration of operation (t
on
) of the
output signal. Depending on the position of the measured value in the
proportional range, the relay is operated for a longer or shorter time pe-
riod.
10
100
Proportional
band
Measured value
1
2
90
0
Switching frequency f or
Pulse
v width
1 Start value Cmin
Measured value with minimum pulse width or switching fre-
quency
2 End value Cmax
Measured value with maximum pulse width or switching fre-
quency
Proportional bands
Relay 1 and 2
Measured value
Relay 1
Relay 2
1
2 2 1
10
100
90
0
Switching frequency f or
Pulse
v width