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The output terminals of the VFD provide a place to connect the three motor leads. These terminals are identified as U, V, and W. The labels R, S, and T for the input voltage and U, V, W for the output terminals are worldwide standards. Some VFDs made in the U.S. before 1990 may still be identified as L1, L2, and L3 for input terminals and T1, T2, and T3 for output terminals where the motor is connected.
The variable frequency drive sizing of 7.5hp with a 5hp motor is due to debating requirements when running the drive at high switching frequencies along with the starting torque requirements of the application. DBR need to be sized to match the braking IGBT within the VFD as far as a minimum resistance is concerned. And the resistor needs to of sufficient kW's to take into to account the duty cycle of the braking.
From aspects of installation you need to choose a well shielded cable segregating from HV cables additionally if it's an incremental encoder the configuration of bipolar is a good noise-immunized, which means you need 4 wires A/A-,B/B- at least from the encoder. If it's extreme circumstance you can choose a fibre as media.
Of course installing a reactor /dv/dt filter to the output of a VFD will reduce common noise and a shielded power cable is highly recommended to use.
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AC Motor Control
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