Deadtime compensation
6.2.19.1 General modification
A distortion of the output voltage occurs by the deadtimes of the power modules,
which causes negative effects (e.g.) for the calculation of the motor model or in
voltage-frequency-characteristic operation. This distortion can be compensated
partly by the activation of the deadtime compensation.
The dead time compensation has been generally revised in the software 2.10 /
3.0.
Instead of the previous dead time compensation based on an e-function, an
IGBT model is now used.
The values identified with the e-function compensation (is05, is06 or
is40...is43 deadtime coeff fswx) can no longer be used.
➢ The compensation was deactivated by default in all previous software versions.
Now the compensation is activated on the basis of the IGBT model calibrated
in the factory, independent of the control mode (also in v/f mode).
➢ For is07 deadtime comp mode value "2: ident“ is no longer allowed. Attempt-
ing to write this value results in the error message "Data invalid".
➢ Value "1: e-function“ is still possible for is07 for compatibility with already ex-
isting applications. Then the dead time compensation continues with the e-
function compensation values calibrated at the factory.
➢ Parameters is05, is06 and is40...is43 are internally available for download
compatibility reasons, but they have no function and they are not visible in
COMBIVIS.
Enables speed-dependent activation/deactivation of the
dead time compensation. Setting of the speed level in %
dr04 rated speed.
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