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A: The DBU is a braking unit and requires an external braking resistor. When the motor have regenerative energy, the DBU detects that DC bus voltage rises and consumes the feedback energy on the braking resistor.
RBU is an energy feedback unit. When RBU detects an increase in DC bus voltage, it will feedback energy back to the AC grid instead of dissipating energy to the resistor. When the motor generates feedback energy, DBU or RBU must be selected, otherwise the inverter will report an OV fault.
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