Product Description:

The RD52.1-4N-400-R-MV-FW belongs to Bosch Rexroth Indramat's RD 500 Drive Controllers series. Designed for centralized cabinet mounting, this unit conditions three-phase line power and feeds induction or synchronous machines in heavy processing lines. It supports closed-loop current and frequency modulation so plant operators can maintain constant motor torque under quickly varying loads, making it suitable for extruders, centrifuges, and large pumps in manufacturing cells. This arrangement lets the drive adjust output to changing process demand while keeping large rotating equipment under stable control.

At a 400 kW continuous rating, the controller can drive high-inertia loads without derating. The input section accepts line voltages from 380 to 480 V, covering common low-voltage industrial grids. Because the supply stage is a three-phase AC converter, it rectifies and inverts power so that motor frequency and amplitude remain independent of the incoming line. Speed and torque are regulated through field-oriented vector control, which resolves stator currents into orthogonal components for fast dynamic response and stable low-speed operation. Thermal management is handled by liquid cooling with an internal pump, a cooling arrangement used on units rated at 132 kW and above. The unit is design generation 1 within the RD52 platform.

Electrical tolerances of ±10% on the line allow installation on feeds with moderate voltage fluctuation without nuisance trips. Dynamic braking energy is externalized because the unit is supplied without a built-in brake chopper, so an external resistor or regenerative module is required for rapid stop cycles. An integrated mains filter suppresses conducted emissions, which can reduce the need for additional line reactors in cabinets that also contain sensitive control electronics. The required program set is ordered as a separate subposition, allowing the control software to match the intended motor and control method.