Ya' Start Of Manipulated Variable Limit / '36.Ye' End Of Manipulated Variable Limit; Ynrm' Standardization Of Manipulated Variable - Siemens SIPART PS2 Series Operating Instructions Manual

8.4.2.8

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

Setting range:
Purpose:
Factory setting:
Note
'YE' must always be set larger than 'YA'.
8.4.2.9

'37.YNRM' Standardization of manipulated variable

Possible settings:
Purpose:
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE
0.0 ... 100.0
These parameters are used to limit the mechanical actuator travel
from stop to stop to the configured values. The value is given in
percent. This allows the mechanical 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 151) parameter.
'Dead angle' function
The dead angle is the angle range in which the process valve allows
no flow. The dead angle range starts at the lower endstop of the
valve, for example, and ends at the angle at which the medium
begins to flow. Use this function if you want to use the entire signal
range for valve control (for example, 4 mA to 20 mA).
To now use the entire signal range for process valve control, set the
lower manipulated variable limit (YA) to the percentage value at
which the medium begins to flow.
To display the new initial value as 0%, set '37.YNRM' Standardiza‐
tion of manipulated variable (Page 151) to 'FloW'.
When 'YA': 0.0
● MPOS
● FLoW
Use the '35.YA' Start of manipulated variable limit / '36.YE' End of
manipulated variable limit (Page 151) 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 varia‐
ble limit / '36.YE' End of manipulated variable limit (Page 151) pa‐
rameters. The 'YA' and 'YE' parameters are shown in the MPOS
scale.
Parameter assignment
8.4 Description of parameters
When 'YE': 100.0
151