Main Circuit Diagram; Charging - ABB ACS880-207 Hardware Manual

14 Operation principle and hardware description

Main circuit diagram


The following figure shows the simplified main circuit diagram of the rectifier.
AC fuses
AC input

Charging


Charging is always needed to power up the DC link capacitors smoothly. Discharged
capacitors cannot be connected to the full supply voltage. The voltage must be increased
gradually until the capacitors are charged and ready for normal use. In ACS880-207 IGBT
supply units, a resistive charging circuit consisting of fuses, a contactor and charging
resistors, is used. The resistive charging circuit is in use after power-up as long as DC
voltage has risen to a predefined level.
The IGBT supply control program has a function for controlling the charging circuit in the
IGBT supply unit. For further information, see the firmware manual.
LCL filter IGBT supply module
DC fuses
DC output