Mitsubishi Electric FR-A700 EC, Инструкция по эксплуатации

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Electromagnetic compatibility (EMC) Wiring
3 - 66
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.
●
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.
Wiring Lenght
≤
50m
50m to 100m
≥
100m
Parameter 72
≤
15 (14.5kHz)
≤
9 (9kHz)
≤
4 (4kHz)
Tab. 3-30: Setting of Pr. 72 according to the wiring lenght
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.