Baumuller b maXX BM2500, Operating Manual

Page: 521 / 822

Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
521
of 820
4
Dead time voltages
Dead time voltages are non-linear occurrences in the output voltage of the converter. This
can have several causes such as the locking time when switching over the IGBTs, differ-
ences of blanking times of the IGBTs and diodes and the threshold voltages of the IGBTs
and diodes. These non-linear voltages invalidate the voltage output of the PWM modula-
tor. They are considerably low compared to the nominal motor voltage. However, the en-
coderless procedures and the accuracy of power displays that are based on the motor
voltage - in particular at lower speeds - can be effected.
4.7.7.1 Parameter Overview of the Controller Adaptations
Functional blocks: FbStromBegr [138]

Functional blocks: FbReglerAdaption [155]
4.7.7.2 Description of the Controller Adaptations parameters
138.23
Kt correction factor
The factor (Kt
corr
) can be specified by this parameter which effects the dependence of the
torque-generating current and the displayed torque as well as the entered torque
("Torque display"
Z
138.21
–
, "Max. torque actual value"
Z
138.20
–
, "Torque limit symmet-
ric"
Z
138.22
–
).
The factor effects the controller only if it reaches the Torque limit symmetric
Z
138.22
–
;
the present values of Ks (or 1/Ks) and Kt are not effected.
The exact collaboration between the torque current and the torque is shown in
Z
Adaption
torque monitoring
–
on page 524 (
Z
Fig. 174
–
).
Number Name Type Min Max Default Value Unit Factor
Read o
n
ly
St
o
ra
g
e
DS Supp
ort
Cyclic W
rite
138.23 Kt correction factor FLOAT 0 100 1 1:1 X
155.1 Mode UINT 0 0xFFFF 0 1:1 X
155.2 State UINT 0 0xFFFF 0 1:1 X