Inverter-Driven 400V Class Motor - Mitsubishi Electric FR-E720-0.1 K Instruction Manual

3.4

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 and limiting the PWM carrier frequency according to the wiring
length
For the 400V class motor, use an insulation-enhanced motor.
Specifically,
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
Pr. 72 PWM frequency selection
(2) Suppressing the surge voltage on the inverter side
Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) on the inverter output side.
NOTE
For details of Pr. 72 PWM frequency selection, refer to page 169.
For explanation of surge voltage suppression filter (FR-ASF-H/FR-BMF-H), refer to the manual of each option.
50m or less
15 (14.5kHz) or less
Inverter-driven 400V class motor
Wiring Length
50m to 100m
8 (8kHz) or less
exceeding 100m
2 (2kHz) or less
47
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