Product Description:

The RD42.1-5R-026-L/S135 is a drive controller manufactured by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It regulates three-phase AC converters for automated machinery that runs on a 500 V line, enabling closed-loop speed and torque control for induction or synchronous motors in material handling, packaging, and process cells. This Generation 1 unit belongs to size class D and is installed in cabinets that accept IP20-rated hardware. The device interfaces with plant mains through a 45 A supply path protected by a 63 A fuse, and it operates without an internal brake chopper, so regenerated energy is returned to the DC bus.

The controller’s intermediate circuit is stabilized at 660 V DC ±10%, supplying up to 26 kW of nominal DC-bus power to the connected inverter section. Forced air cooling moves 0.08 m³/s through the heat sink; this airflow dissipates the thermal losses, which reach 0.8 kW when the unit runs at rated load. Input synchronism with factory grids is maintained across 50/60 Hz mains, and the internal rectifier carries a continuous DC current of 50 A. The converter topology is three-phase, so phase balancing is mandatory during installation. A 500 V operating window matches the voltage range of typical European and Asian medium-power drives, and line disturbances are absorbed by the integrated filter network to protect downstream inverters.

During acceleration or transient overloads, the DC link can deliver a peak current of 75 A (60 s), allowing the inverter to source up to 50 kW (60 s) at the motor terminals before automatic limiting occurs. Under steady conditions, the controller supports a rated output of 33 kW at 500 V. An IP20 housing prevents accidental contact with live parts but requires mounting inside a closed electrical enclosure with forced ventilation.