Lenze E94AxHE Servo Drives 9400 HighLine (Firmware 01-37) - Manual (Page 80)

9400 HighLine | Parameter setting & configuration
Motor interface
Initial commissioning | Select switching frequency
80 Firmware 1.37 - 09/2006
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Automatic chopper frequency reduction
Under
C00018 , it is possible to select "variable" chopper frequencies for the controller.
With this selection, the controller reduces the chopper frequency depending on the
setpoint current.
r Depending on the current, the controller switches down to an assigned chopper
frequency; the modulation mode remains unchanged.
r The switching thresholds are device-dependent (see 9400 Hardware Manual, chapter
"Rated data").
r If instead of a variable switching frequency a fixed switching frequency has been
selected in C00018 , no switching frequency changeover takes place. Due to the
rotating field frequency range of 0...5 Hz only a lower continuous current and
maximum currents can be applied (see 9400 Hardware Manual, chapter "Rated data").
O
Tip!
With the same load profile, a deactivation due to an excessive controller load (I x t)
is more likely with a fixed chopper frequency setting than with a variable setting.