Wiring
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Figure 4.12 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, terminal 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 Circuit Terminals
4.6.1 Precautions
z
Use shielded or twisted-pair cables to connect control terminals.
z
Connect the ground terminal (PE) with shield wire.
z
The cable connected to the control terminal should leave away from the main
circuit and heavy current circuits (including power supply cable, motor cable, relay
and contactor connecting cable) at least 20cm and parallel wiring should be
avoided. It is suggested to apply perpendicular wiring to prevent inverter
malfunction caused by external interference.
