Parameterizing/addressing
9.4 Description of parameters
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
165
Description of parameters 34
34.DEBA - Deadband of closed-loop controller
This parameter is used with value "Auto" to adjust the deadband in automatic mode
continually and adaptively to the requirements of the control loop. If a regulator oscillation is
detected, then the deadband is incrementally enlarged. The reverse adaptation takes place
using a time criterion.
The deadband is set using the values 0.1 to 10.0. Control oscillations can then be
suppressed. The smaller the deadband, the better the control accuracy.
The factory setting is "Auto".
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 165).
Note
"YE" must always be set larger than "YA".
The factory setting is "100".
Description of parameters 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 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.
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