Using a Single Phase Power Source
12.5
Other Considerations
The following lists other precautions that need to be considered when using a three-phase VFD
using single-phase power source.
• Depending on the increased DC ripple, sensorless mode may result in poor performance
when operating a three-phase inverter using single-phase power supply.
• If a phase open trip occurs, cancel the input phase open protection bit setting (PRT-05:
Phase Loss Chk).
• Do not allow the current to exceed the single-phase rating. Motor capacity, motor overload
trip, and E-thermal functions must be set to protect motor.
• A reactor is always required. Use a model type that comes with built-in DC reactor. The iS7
200 V 30–75kW and 400 V 280–375 kW products do not have built-in DC reactors. Install an
external AC reactor separately for these model types (Do not install DC reactors externally).
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