Resistor Brake Unit for Liebherr LHM 250

The resistor brake unit, identified by part number CDBR-4220, functions as an electrical component within the motor control systems of the Liebherr LHM 250. It dissipates excess electrical energy generated when the crane motor operates as a generator during load lowering or deceleration phases. By converting this energy into heat, the unit prevents voltage spikes in the DC bus of the electrical system and protects sensitive electronic drive components.

This component is engineered for integration with the Liebherr LHM 250 mobile harbor crane. It supports the precise control of hoisting and slewing movements, facilitating controlled deceleration of heavy loads. The unit consists of high-power resistors configured to manage the thermal output generated during braking cycles.

Resistor brake units are utilized in systems employing regenerative braking, such as variable frequency drives. Their primary function is to provide a path for excess energy that cannot be returned to the power supply, ensuring the stability of the crane's electrical control architecture during operation.