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Braking Resistors Application Sheet

The braking resistor is connected in the DC link, between the recifier and the switching semi-conductors. When the DC voltage rises, to a preselected limit, a chopper circuit switches in the braking resistor thereby allowing excess energy to be "dumped" in the form of heat, instead of causing damage to the inverter. When the DC level drops to a lower preset minimum limit the braking resistor is switched out of circuit until it is required again.

The data sheet contains a diagram showing how a braking resistor is connected to an inverter and how to calculate the power rating.

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