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16 Operation principle and hardware description
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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.
1
AC supply
2
Input (AC) fuses
3
Supply unit
4
DC bus
5
Inverter DC fuses (with or without a DC switch/disconnector)
6
Inverter units (in this example, one of the two units consists of two inverter modules connected in parallel)
7
Brake chopper fuses
8
Brake unit
9
Brake resistors
10
Brake resistor fuses
11
Motor(s)
12
DC switch/disconnector
13
Charging circuit switch with fuses
14
Charging resistors
t°
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