Operation Principle - ABB ACS380 Hardware Manual

Operation principle

The figure shows the simplified main circuit diagram of the drive.
L1
L2
L3
1 Rectifier. Converts alternating current and voltage to direct current and voltage.
2 DC link. DC circuit between rectifier and inverter.
3 Inverter. Converts direct current and voltage to alternating current and voltage.
4 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.
5 DC connection (UDC+, UDC-). Common DC supply capability pending.
2
1
4
R-
Hardware description 37
3
5
R+
UDC+ UDC-
T1/U
T2/V
T3/W