Wiring
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4.5.5 Wiring of Common DC bus
Common DC bus method is widely used in the paper industry and chemical 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.
Notice: Two inverters must be the same model when connected with Common DC
bus method. Be sure they are powered on at the same time.
4.5.6 Ground Wiring (PE)
In order to ensure safety and prevent electrical shock and fire, PE must be grounded with
ground resistance. The ground wire should be big and short, and it is better to use copper
wire (>3.5mm
2
). When multiple inverters need to be grounded, do not loop the ground
wire.
4.6 Wiring Control Circuits
4.6.1 Precautions
z Use shielded or twisted-pair cables to connect control terminals.
z Connect the ground terminal (PE) with shield wire.
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