Pleiger Elektronik
GmbH & Co. KG
Edition: 6/2007 Subject to modifications Manual for 362MC Page: 43
Appendix C2: Functional extension - Disturbance compensation
The standard functions of the 362MC software can be extendet by additional software, which is to be
installed at the factory. Necessary internal hardware extensions, such as extensions to memory areas,
etc. are installed at the same time.
The functional extension disturbance compensation involves applying a disturbance which affects the
controlled system directly to the controller, so as to compensate the expected effects of this disturbance
on the control process in advance.
The disturbance is weighted via a definable characteristic, delayed via a 1
st
order low pass and added to
the output of the controller. In a special variant for 3-Point step controllers, disturbance compensation is
effected via addition to the controller setpoint (see Compensation).
Selection
The special disturbance compensation function is selected in controllers which are equipped with the
functional extension by assigning an input, e.g. the 3
rd
analogue input “Lin 4..” (with 4-20mA measuring
range), to the “Disturb” parameter in the Input commissioning menu, instead of assigning the value
“NC” (= special function passive). See also Input menu (5.6).
Parameterisation
For the purposes of the disturbance compensation function, the “CtrlPar” commissioning menu
(controller parameters) is extended automatically to include the entry options shown in the table below.
See also Controller parameters menu (5.5)
Compensation
The special disturbance compensation function is not equally applicable or expedient for all
parameterisable controller types. The following notes on application of the disturbance signal thus relate
to the controller types of the 362MC which are selectable under “CtrlTyp” in the Controller parameters
menu.
CtrlTyp = 2-Point and 3-Point
Disturbance compensation is not expedient for these switching controllers without feedback,
and is thus not installed in the 362MC. Selecting this function when these controllers are active
will have no effect on the controller output or the setpoint.
in the Parameter Value (min Meaning Comment
profile each controller max)
Parameter (
1
) following parameter Kw The 1
st
parameter set of the controller is
1
st
parameter set used for disturbance compensation
Tz Tz
Tz Tz
Tz
0.1s 0.1s
0.1s 0.1s
0.1s Filter time for 1
st
order low pass Delays the compensation function.
1000.0s1000.0s
1000.0s1000.0s
1000.0s for disturbance compensation See Compensation delay
Kz 0% Kz 0%
Kz 0% Kz 0%
Kz 0%
-100.0%-100.0%
-100.0%-100.0%
-100.0% Characteristic for disturbance weighting Weighting of the disturbance
100.0% 100.0%
100.0% 100.0%
100.0% Compensation at 0%-disturbance value compensation function is effected
Kz 25% Kz 25%
Kz 25% Kz 25%
Kz 25%
-100.0%-100.0%
-100.0%-100.0%
-100.0% via the characteristic which can be
100.0% 100.0%
100.0% 100.0%
100.0% Compensation at 25%-disturbance value parameterised here.
Kz 50% Kz 50%
Kz 50% Kz 50%
Kz 50%
-100.0%-100.0%
-100.0%-100.0%
-100.0% The characteristic is defined via the
100.0% 100.0%
100.0% 100.0%
100.0% Compensation at 50%-disturbance value interpolation points, Kz. The values
Kz 75% Kz 75%
Kz 75% Kz 75%
Kz 75%
-100.0%-100.0%
-100.0%-100.0%
-100.0% between the points are determined
100.0% 100.0%
100.0% 100.0%
100.0% Compensation at 75%-disturbance value via linear interpolation.
Kz100% Kz100%
Kz100% Kz100%
Kz100%
-100.0%-100.0%
-100.0%-100.0%
-100.0%
100.0% 100.0%
100.0% 100.0%
100.0% Compensation at 100%-disturbance value See also Characteristic
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