ABB ACS880-604, Hardware Manual

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• a backup for the regenerative supply unit is needed.
Simplified main circuit diagram of the drive system
This diagram shows a typical common DC bus drive system.
0
0 0 0
0
a
0
a
0
0
t°
AC supply 1
Input (AC) fuses 2
Supply unit 3
DC bus 4
Inverter DC fuses (with or without a DC switch/disconnector) 5
Inverter units (in this example, one of the two units consists of two inverter modules connected in parallel) 6
Brake chopper fuses 7
Brake unit 8
Brake resistors 9
Brake resistor fuses 10
Motor(s) 11
DC switch/disconnector 12
Charging circuit switch with fuses 13
Charging resistors 14
16 Operation principle and hardware description