EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Manual de Instruções descarregar pdf (Página 38)

Instruction Manual alpha-pH 1000

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 Î greater t

Xp exceeded Î t

= T (relay remains picked up)

OFF

Pulse Length T

Relay

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 Î greater f (greater frequency)

Xp exceeded Î max. frequency

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EUTECH INSTRUMENTS ALPHA PH1000 PHORP CONTROLLERTRANSMITTER Manual de Instruções Página 38