Delta ASDA-A3 Series User Manual page 65

Installation
Winding several turns of wire onto the ferrite ring can increase inductance and the ability to filter
out high-frequency noise. The suggested winding methods are shown as follows:
2
For 4.5 kW to 7.5 kW models
1.
For 11 kW to 15 kW models
2.
Note:
Refer to Section 3.1.6.5 for the selection of the motor power cable.
1.
Only the motor power cable or power cable can run through the ferrite ring. If needed, prepare extra
2.
ferrite rings for grounding.
An EMI filter for absorbing radiation may be required when using a longer motor power cable.
3.
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ASDA-A3