Resistant Box

Braking resistors are used in the d.c Link of the frequency converter. A braking chopper activates the resistor. if the output frequency converted drops-be it by a control process, a drop in speed or a braking operation-below the current operating frequency of the motor, the motor takes on the function of a generator. The consequences id arise in the link voltage. if this voltage exceeds the specific value of the unit in question, chopper will activate the braking resistor. if the voltage drops to a value just the grid voltage of the link, the chopper will interupt the circuit. This process will be repeated until the motor speed once again matches the applied operating frequency. The braking resistor takes on the energy and converts it into the heat.