Emf-Error Value Filter; Pi -Gain Value Scaling; Pi - Controller Output Limitation - ABB DCS 500B Description

EMF-error value
filter
PI -gain value
scaling
PI - controller
output limitation
DCS 500 Software Description
erroneous result.
The limit at which the I-part is released can be defined by parame-
ter:
EMF REL LEV (1011)
The EMF actual value can be filtered for the controller by means of
1st order filter. The time constant of the filter can be given by pa-
rameter
EMF FILT TC (513)
P-gain of the controller is reduced above the field weakening point
by the factor 1/n in order to keep the process gain constant. P-gain
can be adjusted by means of parameter
EMF KP (1007)
I-time constant does not have 1/n scaling factor, and it is separated
from the P-gain value. Time constant = 147200 / EMF KI and it can
be adjusted by means of parameter
EMF KI (1008)
The output of the PI-controller is limited so that 100% of final FLUX
reference is the absolute maximum value. The positive level of the
PI-controller is limited so that at exactly the field weakening point
the positive limit is zero. Above the field weakening point the posi-
tive limit starts to increase to facilitate a smooth transfer to the field
weakening area.
Limits for the PI-controller can be adjusted by means of parameters
EMF REG LIM P (1009)
EMF REG LIM N (1010)
Functional Software description
default value is 50
(100 * 50/3786 = 1.3%)
scaling 1000 = 1s
(0...10000)
Scaling is internal unit
277 = 100 %
(1...999)
Scaling is internal unit
20000 = 7.4 ms
4095 = nominal FLUX
+410 = default (+10%)
-4095 = -nominal FLUX = def.
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