Product Description:

The HLB01.1C-09K0-N03R4-A-007-NNNF is a resistor brake unit produced by Bosch Rexroth Indramat as part of the HLB Resistor Brake Units series. It installs beside IndraDrive power sections to convert regenerated kinetic energy into heat, preventing excessive DC-link voltage during rapid stops in automated machinery. This function is useful on axes that decelerate heavy or fast-moving loads, because returned energy can rise quickly during braking. The module must be mounted with 80 mm of bottom clearance and 300 mm of top clearance so that rising air from natural convection can remove thermal losses while maintaining a balancing factor of 0.8 for uniform load sharing.

During continuous duty the resistor can absorb up to 9.0 kW of electrical power without overheating. It is connected to drive systems whose shared bus operates anywhere between 254 to 750 Vdc; however, conduction does not start until the internal controller senses a link level of 820 Vdc, so normal drive operation is unaffected until the braking threshold is reached. Logic functions are powered from a galvanically isolated supply of 24 V ±20 %. At initial energization the surge limiter permits a peak of 3 A, which helps keep charging current to the resistor and internal capacitors within a controlled range. This operating range is compatible with IndraDrive HCS converter systems used in multi-axis packaging, handling, and machining lines.

Once the inrush window of 50 ms has elapsed, current is limited by the element’s 3.4 Ω nominal resistance, delivering predictable heat dissipation with each braking event. The microcontroller and gate drivers draw only 14 W, which keeps the auxiliary load low inside the cabinet and leaves more supply capacity for related control electronics. With an overall mass of 5.8 kg, the device is light enough for panel mounting next to other drive components. Its footprint stays within the stated clearance envelope, which helps preserve airflow paths and keeps nearby wiring and modules accessible.