Terms; Operation Principle; Line-Side Converter; Motor-Side Converter - ABB ACS800 Hardware Manual

Terms

Line-side converter: A converter that is connected to the supply network and is
capable of transferring energy from the network to the DC link.
Motor-side converter: A converter that is connected to the motor and controls the
motor operation.

Operation principle

The line-side and motor-side converters consist of six insulated gate bipolar
transistors (IGBT) with free wheeling diodes.
The converters have their own control programs. The parameters of both programs
can be viewed and changed using one control panel. The control panel can be
switched between the converters as described on page 86.

Line-side converter

The IGBT supply module 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 filter suppresses the AC voltage
and current harmonics.
By default, the 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.

Motor-side converter

The motor control is based on the Direct Torque Control (DTC) method. Two phase
currents and DC link voltage are measured and used for the control. The third phase
current is measured for earth fault protection.
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The ACS800-31/U31