Product Description:

Bosch Rexroth Indramat manufactures the HLR01.2N-01K0-N68R0-E-007-NNNN as part of the HLR Brake Resistors series. This external resistor converts surplus kinetic energy from an inverter's DC bus into heat, preventing overvoltage events during rapid deceleration or load reversal in industrial automation axes. It is used when regenerated motor energy would otherwise raise the DC bus beyond the acceptable range of the connected drive. By pairing with compatible converters, the module protects drive electronics and helps maintain controlled braking torque in conveyor, packaging, and machining lines. Because the resistor is external to the drive, braking heat is handled away from the converter section, which helps keep the main power electronics from absorbing repeated regenerative pulses. The module is suited to axes that decelerate often or reverse direction under load.

The resistor presents a nominal value of 68.00 Ω, which helps limit DC-link current during braking. Under steady cyclic operation, it dissipates 1.00 kW of heat as continuous braking power. Short braking bursts can reach 8.96 kW, provided the on-time does not exceed 1.11 s. During each pulse, the ceramic element can absorb up to 10.00 kWs of regenerative energy, and compatibility with drives using a 700 VDC bus allows direct connection at the resistor terminals without additional matching components. This balance between resistance and allowable pulse loading supports repeated stop-and-go motion in automated equipment.

Passive heat removal relies on natural convection, so 200 mm of clearance is required above, below, and beside the finned enclosure to maintain airflow. The aluminum casing meets IP54 ingress protection, allowing installation inside cabinets that are exposed to airborne dust. With a mass of 3.96 kg, the module remains compact, and the required connection conductors are 16 AWG copper. Natural airflow is important because the housing sheds heat passively rather than with forced ventilation, so blocked side space can reduce cooling effectiveness. In applications with frequent deceleration commands, adequate spacing around the enclosure helps the resistor cool between braking events and supports stable thermal behavior.