Instruction manual

Instruction manual αlpha DO 2000
42
11.4.5 Control signal of Pulse Frequency Controllers
Relay
ON
tON
tOFF
Pulse Length T
OFF
Time [s]
The output relay of the pulse frequency controller is clock-timed. The pulse duration tON
remains constant at 250 msec. 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:
tON = Const. (250 msec.)
greater divergence Î greater f (greater frequency)
Xp exceeded Î max. frequency