Dc:av (Activation Value); Dc:dv (Deactivation Value); Dc:i (Integration Time); Dc:cr (Integrator Limitation) - W.E.ST. POS-124-U-PFN Technical Documentation Manual

Typical setup
Valve pressure gain: 2,5 %; the activation point has to be set to 3... 5 % (DC:AV 300... 500).
Valve hysteresis: 0,5 %; the deactivation point has to be set to 0,7... 1,0 % (DC:DV 70... 100). The lower the
value the better the accuracy.
DC:CR should be equal to DC:AV. Limiting the control range of the integrator is necessary to avoid long set-
tlement durations.
The optimum integrator time has to be determined experimentally. Starting with higher values is recom-
mended.
The integration time usually has to be determined by experiments. For this it is recommended to start with a
long time (1500 ms) and to reduce it gradually. If overshooting or limit cycling occurs, the time setting has
become too small.

DC:AV (Activation value)

DC:DV (Deactivation value)

DC:I (Integration time)

DC:CR (Integrator limitation)

Command
DC_1:I
DC_1:AV
DC_1:DV
DC_1:CR
DC_2:I
DC_2:AV
DC_2:DV
DC_2:CR
DC:I This parameter is used to define the integrator time. The lower this value the faster the compen-
sation. Low values will result in „limit cycling".
DC:AV This parameter is used to define the activation point (activation value). The DC function is com-
pletely deactivated in case of DC:AV = 0.
DC:DV This parameter is used to define the deactivation point (DV = deactivation value) Within the de-
activation window no compensation value will be calculated (frozen state).
DC:AV = 0 should be used for best positioning, but „limit cycling" can occur. This value should
be set to 50 % of an acceptable error.
DC:CR The output range of the DC function will be limited (CR = control range) by this parameter.
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Parameter
x x= 0... 2000
x x= 0... 2000
x x= 0... 1000
x x= 0... 500
x x= 0... 2000
x x= 0... 2000
x x= 0... 1000
x x= 0... 500
POS-124-U-Ethernet
Unit
ms
0.01 %
0.01 %
0.01 %
ms
0.01 %
0.01 %
0.01 %
Group
EXTRA
08.11.2018