Product Description:

The RD52.1-4B-110-L-NN-FW is a drive controller produced by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. This unit governs three-phase AC motors in automated machinery, providing closed-loop speed and torque regulation so that conveyors, extruders, and press equipment follow programmable motion profiles. By interfacing with PLCs through the standard drive bus of the series, it converts mains energy into variable-frequency output that matches motor performance to changing process demands. This operating method also helps reduce sudden mechanical loading during speed changes and load transitions.

Its rated output of 110 kW allows the controller to supply high-power motors used in continuous production lines. It accepts a three-phase mains range of 380 to 480 V, and operation remains stable within a tolerance of ±10 %, which allows for normal supply variation. Dynamic response is provided by field-oriented vector control, which separates stator current into torque-producing and magnetizing components for accurate adjustment under changing loads. A built-in brake chopper redirects regenerative energy during deceleration to an external resistor instead of allowing the DC-bus voltage to rise. This supports controlled stopping behavior in applications with frequent braking cycles or high rotating inertia.

Thermal management relies on forced air cooling, with internal fans moving cabinet air across heat sinks to keep power semiconductors within their intended temperature range. Line-side interference is reduced by an integrated mains filter, which removes the need for separate EMC filter hardware in many installations. The power section uses a Converter 3 × AC topology that rectifies the incoming supply and then inverts it to the variable frequency required by the motor. The unit is built in Design Generation 1, and this configuration does not include additional drive functions. Its layout is intended for high-demand industrial motion tasks where steady motor control and predictable electrical behavior are required.