Checklist before starting operation
90
PRECAUTIONS FOR USE OF THE INVERTER
Countermeasures are taken
against electrical corrosion on the
motor bearing.
When a motor is driven by the inverter, axial voltage is generated on the motor
bearing, which may cause electrical corrosion of the bearing in rare cases
depending on: condition of the grease used for the bearing, wiring, load,
operating conditions of the motor, or specific inverter settings (high carrier
frequency, EMC filter ON).
Contact your sales representative to take appropriate countermeasures for the
motor.
The following shows examples of countermeasures for the inverter.
• Decrease the carrier frequency.
• Turn OFF the EMC filter.
• Provide a common mode choke
on the output side of the inverter. (This is
effective regardless of the EMC filter ON/OFF connector setting.)
Recommended common mode choke: FT-3KM F series FINEMET
®
common mode choke cores manufactured by Hitachi Metals, Ltd.
FINEMET is a registered trademark of Hitachi Metals, Ltd.
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Checkpoint Countermeasure
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