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Inverter-driven 400v Class Motor - Mitsubishi Electric FR-F700PJ Instruction Manual

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Inverter-driven 400V class motor

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:
(Under general-purpose motor control)
It is recommended to take either of the following measures:
(1) Rectifying the motor insulation and limiting the PWM carrier frequency according to the wiring length
For the 400V class motor, use an insulation-enhanced motor.
1)Specify the "400V class inverter-driven insulation-enhanced motor".
2)For the dedicated motor such as the constant-torque motor and low-vibration motor, use the "inverter-driven,
dedicated motor".
3)Set Pr. 72 PWM frequency selection as indicated below according to the wiring length
PWM frequency selection
Pr. 72
(2) Suppressing the surge voltage on the inverter side
Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) to the inverter output side.
(Under IPM motor control)
When the wiring length is 30m or longer, use the inverter at the carrier frequency of 2.5kHz (Pr. 72 = "0 to 4").
 For details of Pr. 72 PWM frequency selection, refer to page 181.
 For explanation of surge voltage suppression filter (FR-ASF-H/FR-BMF-H), refer to the manual of each option.
Wiring Length
50m or less
50m to 100m
15 (14.5kHz) or less
8 (8kHz) or less
exceeding 100m
4 (4kHz) or less


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