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If the inverter is connected to multiple motors, a separate thermal overload switch
or a circuit breaker must be used for protecting each cable and motor. These
devices may require a separate fuse to cut off the short-circuit current.
3.3.3 Implementing a bypass connection
It is necessary to set power frequency and variable frequency conversion circuits for the assurance of
continuous normal work of the inverter if faults occur in some significant situations.
In some special situations, for example, if it is only used in soft start, the inverter can be conversed into
power frequency running after starting and some corresponding bypass should be added.
Never connect the supply power to the inverter output terminals U, V and W.
Power line voltage applied to the output can result in permanent damage to the
inverter.
If frequent shifting is required, employ mechanically connected switches or contactors to ensure that the
motor terminals are not connected to the AC power line and inverter output terminals simultaneously.
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