Stratos®Pro A4... PH User Manual
Stratos®Pro A4... PH User Manual
Stratos®Pro A4... PH User Manual
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Controller Functions<br />
Pulse Length / Pulse Frequency Controller<br />
Pulse length controller (PLC)<br />
The pulse length controller is used to operate a valve as an actuator.<br />
It switches the contact on for a time that depends on the controller<br />
output. The period (pulse length) is constant. A minimum ON time of<br />
0.5 sec is maintained even if the controller output takes corresponding<br />
values (Y=0: Off).<br />
Output signal (relay contact) of pulse length controller<br />
1<br />
0<br />
1<br />
0<br />
ON time (Y = 20 %)<br />
ON time (Y = 80 %)<br />
Pulse length<br />
Pulse frequency controller (PFC)<br />
The pulse frequency controller is used to operate a frequency-<br />
controlled actuator (metering pump). It varies the frequency with<br />
which the contacts are switched on. The maximum pulse frequency<br />
[pulses/min] can be defined. It depends on the actuator.<br />
The contact ON time is constant. It is automatically calculated from<br />
the user-defined maximum pulse frequency:<br />
Output signal (relay contact) of pulse frequency controller<br />
ON time<br />
1<br />
0<br />
Pulse frequency (Y = 20%)<br />
1<br />
0<br />
Pulse frequency (Y = 80%)<br />
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