Inverter-Driven 400V Class Motor - Mitsubishi Electric FR-A700 Instruction Manual

Electromagnetic compatibility (EMC)
3.9.5

Inverter-driven 400V class motor

In the PWM type inverter, a surge voltage attributable to wiring constants is generated at the mo-
tor terminals. Especially for a 400V class motor, the surge voltage may deteriorate the insula-
tion. When the 400V class motor is driven by the inverter, consider the following measures:
● 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.
– Specify the "400V class inverter-driven insulation-enhanced motor".
– For the dedicated motor such as the constant-torque motor and low-vibration motor, use
the "inverter-driven, dedicated motor".
– Set Pr. 72 "PWM frequency selection" as indicated below according to the wiring length.
Parameter 72
Tab. 3-30: Setting of Pr. 72 according to the wiring lenght
● Limiting the voltage rise speed of the frequency inverter output voltage (dU/dT):
If the motor requires a rise speed of 500V/µs or less you must install a filter in the output of
the inverter. Please contact your Mitsubishi dealer for more details.
NOTES For details of Pr. 72 "PWM frequency selection", refer to section 6.19.
When using an option sine wave filter (MT-BSL/BSC) for the 02160 or more, set "25"
(2.5kHz) in Pr. 72.
Do not perform vector control with a surge voltage suppression filter (FR-ASF-H) or sine
wave filer (MT-BSL/BSC) connected.
3 - 66
≤ 50m
≤ 15 (14.5kHz)
Wiring Lenght
50m to 100m
≤ 9 (9kHz)
Wiring
≥ 100m
≤ 4 (4kHz)