ABB ACS880-01 - Main Circuit

￭ Main circuit
The main circuit of the drive is shown below.
L1
L2
L3
T1/U
T2/V
T3/W
ACS880-01
R- UDC+ UDC-
R+
1 2 3
4
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 necessary. The chopper operates when the DC link
voltage exceeds a certain maximum limit. The voltage rise is typically caused by decel-
eration (braking) of a high inertia motor. User obtains and installs the brake resistor
when needed.
4
30 Operation principle and hardware description