Dynamic braking is the dissipation of excess energy coming from an electromechanical drive system that generates electrical energy in braking mode. An electromechanical drive system that is braking is generating electricity. The electricity will flow back into the electronic drive inverter, causing an increase in the system voltage. This is potentially harmful to the electronic components of the inverter and must be dealt with. The brake resistor dissipates this excess energy and keeps the voltage below safe values.