Product Description:

The RD52.1-4B-400-R-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Positioned between the three-phase mains and an AC motor, it converts and regulates incoming power so automated equipment can follow commanded torque and speed with stable response. In production systems, the unit supports controlled acceleration, regulated braking, and repeatable speed control across demanding duty cycles. It is intended for high-power applications such as rolling mills, marine propulsion systems, wind-tunnel dynamometers, and other heavy industrial machines that require sustained drive performance.

The controller delivers a continuous mechanical output of 400 kW, which suits large extruders, test stands, and paper-processing lines. It accepts 380 to 480 V mains and tolerates ±10 % variation without derating, which helps when plant supply conditions fluctuate under changing load. Heat is removed by liquid cooling with an internal pump, a method used on units above 132 kW to keep internal temperatures within the intended range. Power is supplied from a three-phase AC converter feed, and the integrated mains filter reduces conducted emissions on the supply side.

A built-in brake chopper dissipates surplus DC-link energy during rapid deceleration, which helps prevent overvoltage trips when the driven load returns energy to the drive. Dynamic torque commands are processed through field-oriented vector control, allowing precise flux regulation and fast current response during speed changes and load disturbances. An external 24 V standby power input keeps the control electronics active when the main supply is off, so diagnostic and interface functions can remain available. The unit is design generation 1, and its control section is arranged for high-power operation where stable regulation and monitored stopping behavior are required.