ABB ACS180, Hardware Manual

Page: 26 / 168

Operation principle
The ACS180 is a drive for controlling asynchronous AC induction motors and
permanent magnet synchronous motors. It is optimized for cabinet mounting.
￭ Simplified main circuit diagram
The figure shows the simplified main circuit diagram of the drive.
R-
L1
L2
L3 T1/U
T2/V
T3/W
R+
UDC+ UDC-
1 2 1
3
1
4
1
5
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
Brake chopper. Conducts the surplus energy from the intermediate DC circuit of the
drive to the brake resistor when it is necessary and if an external brake resistor is
connected to the drive. The chopper operates when the DC link voltage exceeds a certain
maximum limit. The voltage rise is typically caused by deceleration (braking) of a motor.
The user obtains and installs the brake resistor when needed (exist only on frame
R2...R4). 4
DC connection (UDC+, UDC-), (exist only on frame R2...R4). 5
Product variants
The product has two primary variants:
• Standard variant (ACS180-04S-...) which has integrated Safe torque off (STO)
and category C2, C3 or C4 EMC level (C2 for ...-1 type, C3 for ...-4 type, C4 for
...-2 type).
• Base variant (ACS180-04N-...) which has category C4 EMC level (no internal
EMC filter) and no integrated STO.
26 Operation principle and hardware description