The ACS800-1736Operation principleThe line-side and motor-side converters have their own RDCU control units andcontrol programs. The parameters of each program can be viewed and changedusing one control panel. The converter to be controlled can be selected using thecontrol panel; see section Controls below.Line-side converterThe line-side converter rectifies three-phase AC current to direct current for theintermediate DC link of the drive. The intermediate DC link is further supplying themotor-side converter that runs the motor.The LCL filter suppresses the AC voltage distortion and current harmonics.The IGBT supply module is a four-quadrant switching-mode converter, i.e. the powerflow through the converter is reversible. By default, the converter controls the DC linkvoltage to the peak value of the line-to-line voltage. The DC voltage reference can beset also higher by a parameter. The control of the IGBT power semiconductors isbased on the Direct Torque Control (DTC) method also used in the motor control ofthe drive. Two line currents and the DC link voltage are measured and used for thecontrol.AC voltage and current waveformsThe AC current is sinusoidal at a unity power factor. The IGBT supply unit does notgenerate characteristic current or voltage overtones like a traditional 6- or 12-pulsebridge does.AC fuses LCL filter IGBT supply moduleAC input IntermediateDC link
