• No : 21404
  • Release Date : 2018/08/22 16:27
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Surge voltage of 400 V motor

To upgrade the existing facilities, what is necessary in addition to the inverter for when 400 V motor and inverter are used.
Is there possibility of motor burnout since the motor is not upgraded this time?
Category : 


When the wire between the 400 V inverter and motor is long (20 m or longer), surge voltage occurs momentarily. This voltage is as two or more times as the DC voltages converted by the inverter (400 VAC × √2 = 565 VDC), and is 1000 VDC or higher.
Since this voltage can deteriorate insulation of the motor:
1. Use an insulation-enhanced motor.
2. Attach the surge voltage suppression filter (FR-ASF-H).
Consider the above countermeasures.
Product Name
Inverter, magnet motor drive
Product Category
FR-A024, FR-E500, FR-A100, FR-F500, FR-A200, FR-A500, FR-V200