Siemens SIPART PS2 6DR50xx Instrucciones de operaciones descargar pdf (Pagina 145)

Parameterizing/addressing

10.4 Description of parameters

SIPART PS2 with and without HART communications

Operating Instructions, 09/2007, A5E00074631-07

145

In the other discrete settings, the fixed value for the dead zone is edited.

The factory setting is "Auto".

10.4.2.7 Description of parameters 35 and 36

35.YA - Start of the manipulated variable limit

The factory setting is "0".

and

36.YE - End of the manipulated variable limit

These parameters are used to limit the mechanical actuator travel from stop to stop to the

configured values. This allows the mechanical positioning range of the actuator to be limited

to the effective flow, preventing integral saturation of the controlling closed-loop controller.

See figure in

Description of parameters 37 (Page 145).

Note

"YE" must always be set larger than "YA".

The factory setting is "100".

10.4.2.8 Description of parameters 37

37.YNRM - Normalization of manipulated variable

Using the "YA" and "YE" parameters, you can limit the manipulated variable. This limitation

causes two different scaling types, MPOS or FLOW, for the digital display and for the

position feedback through the current output. See the figure below.

The MPOS scaling type shows the mechanical position from 0 to 100% between the hard

stops of the initialization. The position is not influenced by the "YA" or "YE" parameters. The

parameters "YA" and "YE" are shown in the MPOS scale.

The FLOW scale is a scaling from 0 to 100% over the range between the "YA" and "YE"

parameters. Over this range, the setpoint w is also always 0 to 100%. This results in a more

or less flow-proportional display and position feedback "I

". The flow-proportional display and

position feedback "I

" also results from the use of valve characteristics.

In order to calculate the regulation difference, the setpoint in the digital display is also shown

to the corresponding scale.

The following uses the example of an 80-mm linear actuator to illustrate the dependence of

the stroke on the scaling as well as the parameters "YA" and "YE".

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Siemens SIPART PS2 6DR50xx Instrucciones de operaciones Pagina 145