Product Description:

The RD52.1-4B-055-W-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It converts industrial three-phase power into a controlled output for induction or synchronous motors, allowing precise acceleration, deceleration, and stable operating speeds in automated production cells, material-handling lines, and process equipment. This makes the unit suitable for applications that require smooth speed changes and consistent motor response during repeated operating cycles.

This model supplies up to 55 kW of motor power while maintaining regulation across the input window of 380 to 480 V. The permitted mains deviation is ±10 %, so the unit can continue operating when plant voltage remains within that range. The supply type is Converter 3 x AC, which means the controller draws balanced current from all three phases. Motor torque is calculated and modulated through field-oriented vector control, which measures real-time current components and aligns them with the rotor field to improve dynamic response and steady-state accuracy. An integrated mains filter attenuates conducted noise, helping the cabinet meet typical EMC limits without extra external hardware. The unit uses design generation 1 hardware within the RD 500 platform.

Thermal management is handled by liquid cooling, so heat is removed through a coolant circuit rather than cabinet air, reducing enclosure temperature and supporting dense multi-axis layouts. A built-in brake chopper dissipates excess DC-bus energy during rapid deceleration, which removes the need for an external resistor module in most cases. Control electronics can remain active during plant shutdowns because a 24 V stand-by power input keeps parameter memory and communication functions available. This helps the controller return to operation without losing stored settings after a brief interruption to the main supply.