Baumuller b maXX BM5800 - Page 484

Controllers
Parameter manual b maXX BM5800
Document No.: 5.16029.03 Baumüller Nürnberg GmbH
484
of 814
3.7
Special case: Permanent field current
The field weakening mode "permanent field current" (Z142.1– bit 0 = 1) makes it possible
to apply the field current preset value Z19.9– permanently (lsd set value Z47.2– = Field
current preset value Z19.9–). In this case the field weakening factor is without effects.
Therefore, the flux controller is deactivated at the ASM. The targeted flux is calculated
from the magnetization identification as follows:
with:
Flux
set
Flux set value in % Z146.13–
Lh(Imr) Lh-characteristic (see ZLh-characteristic– on page 123)
Imr Magnetizing current. Imr = Isd set value is defined in this case.
Isd
set
Field current preset value Z19.9–
Flux
nom
Nominal value of the magnetic flux in Vs
Mode of operation of the field weakening factor
The field weakening factor at the ASM directly influences the current flux set value and at
the SM the field current set value as follows (also see diagram in
ZFig. 127–):
m Asynchronous machine (Z142.1– bit 0 = 0):
Flux set value in % Z146.13– = Field weakening factor Z142.2– * 100 

 Considering the extreme cases:
Field weakening factor = 0 means that a flux will not be applied.
Field weakening factor = 1 means that a flux set value of 100% 
will be applied.
For the range 0 < Field weakening factor < 1, the following applies: The flux set 
value will be applied proportionally.
m Synchronous machine (Z142.1– bit 0 = 0):
Isd set value Z47.2– = 
Field current preset value Z19.9– * (1 - Field weakening factor Z142.2–)
 Considering the extreme cases:
Field weakening factor = 0 means that the value set for the field current 
reference value will be applied.
Field weakening factor = 1 means that the value set for the field current 
reference value will not be applied.
For the range 0 < Field weakening factor < 1, the following applies: The value set
for the field current reference value will be 
applied proportionally.
Flux
set
[%] Lh ImrIsd
set
Flux
nom
=