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Chapter 7 - Options
7-31
7.6.4 Micro surge filter (Designed for 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 taking either of the following measures:
1) Rectifying the motor insulation
For the 400V class motor, use an insulation-rectified motor. Specifically,
1) Specify the “400V class inverter-driven, insulation-rectified motor”.
2) For the dedicated motor such as the constant-torque motor and low-vibration motor, use the “inverter-driven,
dedicated motor”.
2) Suppressing the surge voltage on the inverter output side
On the secondary side of the inverter, connect the optional surge voltage suppression filter.
Wiring
Caution
_ Check the Input/Output when wiring the filter.
_ Wiring distance from inverter output to filter input should not exceed 5 meter.
_ Wiring distance from filter to motor should not exceed 300 meter .
U,V,W
Inverter
Motor
5m
Within 5m Within 300m
Surge
filter