Inverter-Driven 400V Class Motor - Mitsubishi Electric FR-A520-0.4K Instruction Manual

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".
Note: If the wiring length between the motor and inverter is 40m or longer, set Pr. 240 to long wiring
mode in addition to the above measures to operate the inverter. (Refer to page 106 for Pr. 240
"soft-PWM setting".)
(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).
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INSTALLATION AND WIRING