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Inverter-driven 400v Class Motor - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p series.
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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
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.
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) to the 55K or lower and the sine wave filter
(MT-BSL/BSC) to the 75K or higher on the inverter output side.
Under IPM motor control
Set Pr.72 PWM frequency selection according to the wiring length as shown below.
Applied inverter
FR-F740P-0.75K to 1.5K
Other
CAUTION
· For details of Pr. 72 PWM frequency selection , refer to page 182. (When using an optional sine wave filter (MT-BSL/BSC) for the or
more, set "25" in Pr.72 (2.5kHz).)
· The surge voltage suppression filter (FR-ASF-H/FR-BMF-H) option and sine wave filter (MT-BSL/BSC) cannot be used under
IPM motor control, so do not connect them.
· 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.
Wiring Length
50m or less
50m to 100m
15(14.5kHz) or less
9(9kHz) or less
Wiring Length
50m or less
0(2kHz) to 15(14kHz)
0(2kHz) to 15(14kHz)
Inverter-driven 400V class motor
exceeding 100m
4(4kHz) or less
50m to 100m
5(2kHz) or less
9(6kHz) or less
3
53

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