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Characteristics of Pulse Length and Pulse Frequency
ON
OFF
Controller signal of Pulse length Controllers
The output relay of the pulse length controller is clock-timed. The switching period T remains constant. Depending on the
divergence from the limit value, the switch-on time t
Xp.
The following applies:
t
+ t
= T (Const.)
ON
OFF
greater divergence
greater t ON
Xp exceeded
t
= T (relay remains picked up)
ON
ON
OFF
Controller signal of Pulse Frequency Controllers
The output relay of the pulse frequency controller is clock-timed. The pulse duration t
Depending on the divergence from the limit value, the frequency ( 1 / T ) is increased or decreased in accordance with the
proportional range Xp.
The following applies:
t
= Const. (250 msec.)
ON
greater divergence
greater f (greater frequency)
Xp exceeded
max. frequency
42
Relay
Pulse Length T
t
t
ON
OFF
is increased or decreased in accordance with the proportional range
ON
Relay
Pulse Length T
t
t
ON
OFF
Time [s]
Time [s]
remains constant at 250mS.
ON
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