Product Description:

The HLT05.1W-245K-N-D7-NNNN is a braking unit produced by Bosch Rexroth Indramat within the HLT Braking Units series. Intended for multi-axis drive assemblies in industrial automation, the module ties directly to the shared DC bus and converts surplus kinetic energy into heat, preventing overvoltage when motors decelerate or when an emergency stop is triggered. This function keeps inverters, capacitors, and connected machinery within safe electrical limits.

Its continuous power rating of 245 kW indicates the thermal capacity the chopper circuit can dissipate indefinitely without exceeding its allowable temperature. For short bursts, the unit withstands 495 kW for two seconds, allowing rapid braking of large inertial loads. The braking transistor operates on a nominal DC bus of DC 750 V; it begins conduction at 820 V, switches fully by 850 V, and tolerates inputs up to 980 V. A DC connection current capability of 500 A accommodates high drive groups, while the control electronics draw only 630 mA from the 24 V logic supply. Full-load thermal losses equal 1000 W, and forced-air cooling removes this heat. The open-style IP00 housing requires installation inside a ventilated cabinet.

Additional ratings describe installation constraints and protection measures. During one-minute duty, the unit can dissipate 350 kW, allowing operation between the continuous and peak ranges. The external resistor bank must not drop below 1.0 Ω, because lower values would exceed the permissible current through the chopper. For fault clearing, the power path withstands a short-circuit current of 85 kA rms, matching high-capacity fusing systems. With a shipping mass of 23 kg, the module remains suitable for panel mounting and adds stability to the internal heat sinks. Because it relies on air cooling, adequate cabinet airflow must be provided to keep semiconductor junctions within allowable limits after extended braking cycles.