When a variable frequency drive decelerates an AC motor, especially one with a large inertial load attached, a braking resistor may be required to help dissipate the energy. Larger AC drives also require that dynamic braking units be used in conjunction with the appropriate braking resistors.
Braking units are applied to absorb the motor regeneration energy when the three-phase induction motor stops by deceleration. Use Dynamic Braking to quickly stop a motor or decelerate a large load. The braking unit will convert the excess energy into current and dump it into a braking resistor (dissipates the energy as heat).
DURApulse braking units start at
Braking resistors are used to increase the braking torque of the AC drive, for frequently repeated ON-OFF cycles of the AC drive, or for decelerating a load with large inertia.