du/dt and common mode filtering 171
The abbreviations used in the table are defined below.
Additional requirements for ABB motors of types other than M2_,
M3_, M4_, HX_ and AM_
Use the selection criteria given for non-ABB motors.
Additional requirements for the braking applications
When the motor brakes the machinery, the intermediate circuit DC voltage of the
drive increases as well as the motor supply voltage by up to 20 percent. Consider this
voltage increase when you specify the motor insulation requirements if the motor will
be braking a large part of its operation time.
Example:
Select the motor insulation system for a 400 V AC line voltage application
as if the drive were supplied with 480 V.
Installing du/dt and common mode filters
Follow the instructions provided with the filters.
Abbreviation Definition
U
N
Nominal AC line voltage
Û
LL
Peak line-to-line voltage at motor terminals which the motor insulation must
withstand
P
N
Motor nominal power
du/dt du/dt filter at the output of the drive
CMF Common mode filter
N N-end bearing: insulated motor non-drive end bearing
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