Operation principle
The ACH580-01 is a drive for controlling asynchronous AC induction motors, permanent
magnet motors and synchronous reluctance motors (SynRM).
The figure below shows the simplified main circuit diagram of the drive.
L1
L2
L3
T1/U
T2/V
T3/W
R- UDC+
R+
1 2 3
4
UDC-
5
A
DriveA
Rectifier. Converts alternating current and voltage to direct current and voltage.1
DC link. DC circuit between rectifier and inverter.2
Inverter. Converts direct current and voltage to alternating current and voltage.3
Built-in brake chopper (R-, R+) in frames R1…R3. Conducts the surplus energy from
the intermediate DC circuit of the drive to the brake resistor when necessary. The
chopper operates when the DC link voltage exceeds a certain maximum limit. The
voltage rise is typically caused by deceleration (braking) of a high inertia motor. The
user obtains and installs the brake resistor when needed.
4
DC connection (UDC+, UDC-), for an external brake chopper in frames R4…R9.5
Layout
Frames R1…R2
The layout of a frame R1 drive is presented below. The main structure of frame R2 is
similar to R1. IP55 / UL Type 12 frames are also slightly different from IP21 / UL Type 1
frames, for example, IP21 / UL Type 1 front cover has two parts while IP55 / UL Type 12
front cover only has one part.
36 Operation principle and hardware description
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