Hardware Manual

Table Of Contents
26 Operation principle and hardware description
Main circuit
The main circuit of the drive is shown below.
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 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. User obtains and installs the brake
resistor when needed.
L1
L2
L3
T1/U
T2/V
T3/W
ACS880-01
R- UDC+ UDC-
R+
1 2 3
4