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"
Z138.21–, "Max. torque actual value" Z138.20–, "Torque limit symmet-
ric" Z138.22–).
The factor effects the controller only if it reaches the Torque limit symmetric Z138.22–;
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 ZAdaption
torque monitoring– on page 524 (ZFig. 174–).
Number Name Type Min Max Default Value Unit Factor
Read only
Storage
DS Support
Cyclic Write
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
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