HP 30 30 manual Rectifying the motor insulation

Chapter 7 - Options

7.6.4Micro 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

Inverter

U,V,W

Surge

filter

Motor

Within5m ￿5m Within 300m

_

_

_

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 .

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