VARIABLE-SPEED DRIVES:CABLING DETAILS FOR AC DRIVES

CABLING DETAILS FOR AC DRIVES

The cable connections from the inverter to the motor and ground are important details required to achieve a successful ac drive installation due to the fast switching rates. These details are applicable for the ac drives. However, they are mandatory for IGBT drives due to the higher switching rates. If this information is not properly followed, problems can occur in the motor and cable insulation, bearings, or EMI.

The most important criterion for power cabling is the symmetry of the cable and grounding practices. The symmetry is required to ensure cancellation of any stray fluxes. This will minimize the bearing currents and EMI radiation. The components within the inverter should also be symmetric.