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The peak line-to-line voltage at the motor terminals generated by the drive as well asthe voltage rise time depend on the cable length. The requirements for the motorinsulation system given in the table are “worst case require-ments coveringinstallations with 30 metre and longer cables. The rise time can be calculated asfollows: Read ÛLL and du/dt from the diagrams below. Multiplythe values of the graph by the supply voltage (UN). In case of drives with an IGBTsupply unit or resistor braking, the ÛLL and du/dt values are approximately 20 %higher.
