• The supply unit of the drive does not have AC or DC chokes. Therefore, the installer
must arrange for a sufficient inductance at the AC side of each supply module with
suitable cabling. The minimum length of the supply cable per each supply module is 5
meters (16.4 feet). The inductances between the parallel-connected supply modules
must be identical, ie. the cabling to each module must be identical in regard to cable
type and length.
￭ Charging
A charging circuit powers up the DC capacitors of the drive smoothly. Discharged capacitors
cannot be directly connected to full supply voltage. The charging current must be limited
until the capacitors are charged and ready for normal use.
An internal charging circuit is available by specifying option +F272. Drives with +F272 have
a charging switch on the supply unit cubicle door as well as terminals for the connection of
a 3-phase supply for the charging circuit.
Drives without +F272 must be charged through an external charging circuit. If practical, the
circuit can be combined with the transformer magnetizing circuit.
26 Operation principle and hardware description
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