Lenze EDB9300UES - Manual (Page 7)

Brief description
2 BA8230
1.2 Basic operation The link voltage is generated from the mains supply through the mains rectifier. A 3-
phase choke connected to the mains supply reduces harmonic currents and serves to
decouple the unit from other converters (consumers) on the same supply network.
8230 frequency inverter are connected as standard to an earthed network.
The link voltage is smoothed by high quality electrolytic capacitors. With the motor
converter these provide the magnetising reactive power required by the motor and
decouple the converter on the mains side from the inverter on the motor side.
Through optimised pulse width modulation the motor converter generates from the
link voltage a sinusoidal 3-phase system with variable frequency and voltage.
A power dump (option) in conjunction with a braking resistor allows braking energy to
be used in regenerative operation.
Control and regulation of the 8230 frequency inverter are fully digital. Different control
structures such as, frequency control, speed control with or without encoder and
torque control with or without encoder can be selected, depending on the application
requirements. The field-orientated control concept provides control dynamics directly
comparable to those of a DC drive.
In addition, various inputs and outputs can be connected individually according to the
task involved. Thus the drive system can very easily be customised for the
requirements of the specific application.
Fig. 1: Summary circuit diagram, basic layout, operation
Show/Hide Bookmarks