Instruction manual

INSTALLATION AND WIRING
38
2.3.5 Inverter-driven 400V class motor
In the PWM type inverter, a surge voltage attributable to wiring constants is generated at the motor terminals.
Especially for a 400V class motor, the surge voltage may deteriorate the insulation. When the 400V class
motor is driven by the inverter, consider the following measures:
•
Measures
It is recommended to take either of the following measures:
(1) Rectifying the motor insulation
For the 400V class motor, use an insulation-rectified motor. Specifically,
1) Specify the “400V class inverter-driven, insulation-rectified motor”.
2) For the dedicated motor such as the constant-torque motor and low-vibration motor, use the
“inverter-driven, dedicated motor”.
(2) Suppressing the surge voltage on the inverter side
On the secondary side of the inverter, connect the optional surge voltage suppression filter (FR-ASF-H).