Product Description:

The HLR05.1W-70K0-N04R0-A-D7-NNNN brake resistor is manufactured by Bosch Rexroth Indramat and belongs to the HLR Brake Resistors series. Within an industrial automation line, it is wired across the DC link of drive converters to absorb surplus regenerative energy whenever motors decelerate. By transforming that excess voltage into heat, it prevents overvoltage faults, stabilizes bus levels, and helps maintain repeatable stopping profiles for axes, hoists, and conveyor sections. This role is important in systems with frequent deceleration, where regenerated energy would otherwise return to the DC link and raise voltage beyond the acceptable operating range.

With a resistance of 4 ohms, the unit draws a predictable current as soon as the link voltage rises above the chopper threshold. It can dissipate a continuous thermal load of 70 kW, a capability supported by its extended fin pack and forced-convection path. Because it is air cooled, adequate cabinet airflow must be provided and monitored. This cooling method suits applications with repeated braking events, provided airflow is maintained through the resistor assembly. The design targets installations that run on a bus potential of DC 750 V, matching the nominal energy storage voltage of compatible drive supplies. For short duty peaks, it tolerates up to 168 kW of braking power, allowing emergency stops or fast indexing moves without oversizing the drive.

The total energy that can be accepted in one braking cycle is limited to 8400 kWs, and the control system should ensure this limit is not exceeded within the specified cycle window of 120 s. The steel enclosure carries a protection rating of IP20, shielding against accidental contact with live elements while leaving heat-dissipating surfaces unobstructed. A permissible switch-on interval of 50 s is the maximum time the resistor may conduct before a mandatory cooling pause. At an installed mass of 145 kg, the component requires rigid mounting points during installation.