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Point to be checked
Precautions are taken for an
overload operation.
The specifications and rating match
the system requirements.
Precautions are taken against
electrical corrosion on the motor
bearing.
&&Our recommended common mode choke is FT-3KM F series FINEMET
Metals, Ltd. FINEMET is a registered trademark of Hitachi Metals, Ltd.
When performing frequent starts/stops by the inverter, rise/fall in the
temperature of the transistor element of the inverter will repeat due to a
repeated flow of large current, shortening the life from thermal fatigue. Since
thermal fatigue is related to the amount of current, the life can be increased
by reducing current at locked condition, starting current, etc. Reducing
current may extend the service life but may also cause torque shortage,
which leads to a start failure. Adding a margin to the current can eliminate
such a condition. For an induction motor, use the inverter and the converter
unit of a higher capacity (up to two ranks). For a PM motor, use the inverter
and the converter unit, and PM motor of higher capacities.
Make sure that the specifications and rating match the system requirements. -
When a motor is driven by the inverter, axial voltage is generated on the
motor shaft, which may cause electrical corrosion of the bearing in rare
cases depending on the wiring, load, operating conditions of the motor, or
specific inverter settings (high carrier frequency and EMC filter enabled).
Contact your sales representative to take appropriate precautions for the
motor.
The following shows examples of precautions for the inverter.
• Decrease the carrier frequency.
• &&Connect the EMC filter ON/OFF female connectors to the OFF male
connectors.
• Provide a common mode choke on the output side of the inverter.
effective regardless of status of the EMC filter ON/OFF connectors.)
PRECAUTIONS FOR USE OF THE INVERTER
Checklist before starting operation
Action
®
common mode choke core which is manufactured by Hitachi
Refer
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