Ya' Start Of Manipulated Variable Limit / '36.Ye' End Of Manipulated Variable Limit; Ynrm' Standardization Of Manipulated Variable - Siemens 6DR50 Series Operating Instructions Manual

Parameterizing/addressing
9.4 Description of parameters
9.4.2.8

'35.YA' Start of manipulated variable limit / '36.YE' End of manipulated variable limit

Adjustment range:
Purpose:
Factory setting:
Note
"YE" must always be set larger than "YA".
9.4.2.9

'37.YNRM' Standardization of manipulated variable

Possible settings:
Purpose:
Factory setting:
164
0.0 ... 100.0
These parameters are used to limit the mechanical actuator travel
from stop to stop to the configured values. This allows the me-
chanical travel range of the actuator to be limited to the effective
flow, preventing integral saturation of the controlling closed-loop
controller.
See the figure in the description of the "'37.YNRM' Standardization
of manipulated variable (Page 164)" parameter.
With "YA": 0.0
• MPOS
• FLoW
Use the "'35.YA' Start of manipulated variable limit / '36.YE' End of
manipulated variable limit (Page 164)" parameters to limit the ma-
nipulated variable. This limitation causes two different scaling
types "MPOS" and "FLoW" for the display and for the position
feedback through the current output.
The MPOS scale shows the mechanical positions from 0 to 100%
between the upper and lower endstops of the initialization. The
position is not influenced by the "'35.YA' Start of manipulated vari-
able limit / '36.YE' End of manipulated variable limit (Page 164)"
parameters. The "YA" und "YE" parameters are shown in the
MPOS scale.
The FLoW scale is the standardization from 0 to 100% in the
range between the "YA" und "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 "IY". The flow-
proportional display and position feedback "IY" also result when
using valve characteristics.
In order to calculate the control deviation, the setpoint in the dis-
play is also shown in 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 on
the "YA" and "YE" parameters; see the following figure.
MPOS
With "YE": 100.0
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12