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Figure 4.15 Wiring of regenerative unit
4.5.5 Wiring of Common DC bus
Common DC bus method is widely used in the paper industry and I5000mical fiber industry which
need multi-motor to coordinate. In these applications, some motors are in driving status while
some others are in regenerative braking (generating electricity) status. The regenerated energy is
automatically balanced through the common DC bus, which means it can supply to motors in
driving status. Therefore the power consumption of whole system will be less compared with the
traditional method (one inverter drives one motor). When two motors are running at the same time
(i.e. winding application), one is in driving status and the other is in regenerative status. In this
case the DC buses of these two inverters can be connected in parallel so that the regenerated
energy can be supplied to motors in driving status whenever it needs. Detailed wiring is shown in
the following figure:
Figure 4.16 Wiring of common DC bus.
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