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16 Operation principle and hardware description
or ACS-AP-x control panel in System info - Licenses. If the license key for the optimal
grid control is missing, the converter indicates fault 6E1F Licensing fault. Auxiliary
code in the event logger indicates the plus code of missing license, in this case N8053.
For further assistance, contact your local ABB representative.
Simplified main circuit diagram
￭
The following figure shows the simplified main circuit diagram of the rectifier.
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1
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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