Siemens SIPART PS2 6DR50xx Betriebsanleitung PDF herunterladen (Seite 30)

Description

3.5 Mode of operation

SIPART PS2 with and without HART communications

30 Operating Instructions, 09/2007, A5E00074631-07

shaft. This controller increment change the actuating pressure until the control deviation

becomes zero.

Pneumatic actuators are available in single and double-acting versions. Only one pressure

chamber is ventilated and depressurized in case of a single-acting version. The pressure

developed works against a spring. Two pressure chambers work against each other in case

of a double-acting version. When ventilating the volume of the one, the volume of the other is

depressurized.

See also

Block circuit diagram for signal-acting or dual-acting drives (Page 31)

3.5.2 Control algorithm

The control algorithm is an adaptive, predictive five-point controller.

In case of large control deviations, the valves are controlled using permanent contact. This

takes place in the so-called fast step zone.

In case of medium control deviations, valves are controlled using pulse-length modulated

pulses. This takes place in the so-called slow step zone.

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Figure 3-15 Functional principle of five-point controller

Small control deviations do not send control pulses in the zone. This takes place in the so-

called adaptive dead zone. The dead zone adaptation and the continuous adaptation of

minimum pulse lengths in the automatic mode ensure the best possible control accuracy with

the smallest number of operating cycles. The start parameters are determined during the

initialization phase and stored in the non-volatile memory. The most important start

parameters are:

● The real actuator travel with mechanical end stops

● Actuating times

● The dead zone size

The number of fault messages, changes in direction and the stroke number are continuously

determined during operation and saved after every 15 minutes. You can read and document

these parameters using communication programs such as PDM and AMS. By comparing the

old values with the current ones, you can draw conclusions about the wear and tear of the

control valve. You can use the diagnostics function for this.

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