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16 Operation principle and hardware description
￭
Simplified main circuit diagram
The following figure shows the simplified main circuit diagram of the rectifier.
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1.
AC voltage
2.
AC fuses
3.
LCL filter
4.
IGBT supply module
5.
DC fuses
6.
DC voltage
￭
Charging
A charging circuit powers up the DC link capacitors of the drive system smoothly. Discharged
capacitors cannot be directly connected to the full supply voltage. The charging current
must be limited until the capacitors are charged and ready for normal use.
In cabinet-installed 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 control program has a function for controlling the charging circuit. For further information,
see the firmware manual.
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4
5
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