HD2 Series Inverter Installation Guidelines
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4.5.4 Bypass connection
In some critical occasions, industrial frequency conversion circuit is necessary to ensure proper
operation of the system when an inverter fault occurs.
In some special cases, such as, only soft startup is needed, it will convert to power-frequency
operation directly after soft startup, corresponding bypass link is also needed.
Do not connect any power source to inverter output terminals U, V and W. The
voltage applied to motor cable may cause permanent damage to the inverter.
If frequent switchover is needed, you can use the switch which carries mechanical interlock or a
contactor to ensure motor terminals will not be connected to input power cables and inverter output
ends simultaneously.
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