EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Instrukcja Obsługi Pobierz pdf (Strona 39)

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

is increased

or decreased in accordance with the proportional range Xp.

The following applies:

+ t

OFF

= T (Const.)

greater divergence → greater t

Xp exceeded → t

= T (relay remains picked up)

Relay

tON

tOFF

Pulse Length T

OFF

Time [s]

Controller signal of Pulse Frequency Controllers

The output relay of the pulse frequency controller is clock-timed. The pulse duration t

remains

constant at 250mS.

Depending on the divergence from the limit value, the frequency (

) is increased or decreased

in accordance with the proportional range Xp.

The following applies:

= Const. (250 msec.)

greater divergence → greater f (greater frequency)

Xp exceeded → max. frequency

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EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Instrukcja Obsługi Strona 39