The ACS800-37
32
Operation principle
The line-side and motor-side converters have their own RDCU control units and
control programs. The parameters of each program can be viewed and changed
using one control panel. The converter to be controlled can be selected using the
control panel; see the section Controls below.
Line-side converter
The line-side converter rectifies three-phase AC current to direct current for the
intermediate DC link of the drive. The intermediate DC link is further supplying the
motor-side converter that runs the motor.
The line-side converter is an active unit that, together with an LCL (inductor-
capacitor-inductor) filter, enables low harmonic distortion at the input terminals of the
drive.
By default, the line-side converter controls the DC link voltage to the peak value of
the line-to-line voltage. The DC voltage reference can be set also higher by a
parameter. The control of the IGBT power semiconductors is based on the Direct
Torque Control (DTC) method also used in the motor control of the drive. Two line
currents and the DC link voltage are measured and used for the control.
AC fuses LCL filter IGBT supply module
AC input Intermediate
DC link
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