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Inverter-driven 400V class motor
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:
z
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
(2) Suppressing the surge voltage on the inverter side
Connect the surge voltage suppression filter (FR-ASF-H/FR-BMF-H) to the 55K or lower and the sine wave filter
(MT-BSL/BSC) to the 75K or higher on the inverter output side.
Wiring Length
50m or less 50m to 100m exceeding 100m
Pr. 72 PWM frequency selection 15 (14.5kHz) or less 9 (9kHz) or less 4 (4kHz) or less
CAUTION
· For details of Pr. 72 PWM frequency selection , refer to page 284. (When using an option sine wave filter (MT-BSL/BSC) for the 75K
or higher, set "25" (2.5kHz) in Pr. 72. )
· For explanation of surge voltage suppression filter (FR-ASF-H/FR-BMF-H) and sine wave filter (MT-BSL/BSC), refer to the
manual of each option.
· The surge voltage suppression filter (FR-ASF-H/FR-BMF-H) can be used under V/F control and Advanced magnetic flux vector
control. The sine wave filter (MT-BSL/BSC) can be used under V/F control.