Product Description:

The RD52.1-4N-160-R-V1-FW/S109 is a power-electronics unit produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Positioned between the incoming power supply and the motor group, it conditions line power, modulates current, and provides closed-loop regulation for high-capacity variable-speed applications in process lines, test benches, and heavy conveyor systems. By translating PLC commands into controlled three-phase output, the device supports accurate torque, speed, and direction control for induction or synchronous machines used in automated manufacturing cells. This operating role lets one controller manage acceleration, steady-state running, and commanded deceleration from a single power stage.

This variant uses field-oriented vector control, a method that calculates rotor flux in real time to deliver precise torque even at low speed. That control method helps maintain stable load response during slow-running process sections and during speed changes under heavy inertia. The converter provides a continuous output rating of 160 kW, which suits large pump or extruder duties. It is intended for supply networks rated from 380 to 480 V, and the incoming feeder uses a 3 x AC converter topology that rectifies and inverts three-phase power. Component tolerances permit a line fluctuation of ±10 %, so the drive can operate through common utility variation without derating.

Thermal management relies on liquid cooling with an internal pump that circulates coolant through the heat sink and helps keep the semiconductors below critical junction temperature as output rises. Liquid circulation moves heat away from the power section more effectively than passive cooling in high-load cabinets. Line-side electromagnetic interference is reduced by an integrated line filter, which removes the need for a separate cabinet-mounted filter. Dynamic braking energy is not handled internally because the device is supplied without a built-in brake chopper, so applications with regenerative stops require external braking hardware. Control electronics can remain active through 24 V standby power, which allows the control section to stay ready when the main power stage is off.