Product Description:

The RD52.1-4B-110-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. By converting fixed mains power into variable voltage and frequency, it forms the electronic interface between a plant's three-phase supply and the connected motor set. The unit is installed in automated lines that need precise speed and torque management, such as packaging machines, material-handling systems, and continuous-process equipment.

Rated output is 110 kW, giving the controller enough headroom for large pumps, extruders, or hoists. It accepts a line voltage from 380 to 480 V, so it can be wired directly to standard low-voltage distribution without a transformer. Motor regulation is executed with field-oriented vector control, a method that calculates rotor flux in real time to maintain steady torque during rapid load shifts. Thermal management relies on forced air cooling; internal fans draw cabinet air across heat sinks to keep semiconductor junctions within limits. For deceleration, a built-in brake chopper diverts regenerative power to an external resistor and helps prevent DC-bus overvoltage.

Input power is treated by an integrated mains filter, which reduces conducted emissions so the cabinet can better meet electromagnetic compatibility limits. The power stage is classified as a Converter 3 x AC unit, meaning it rectifies the incoming three-phase line and then inverts it to controlled AC for the motor windings. Control electronics remain active through external 24 V standby power, which keeps communication and diagnostic functions available when the main supply is isolated. Line fluctuations are tolerated within ±10 %, which helps reduce nuisance trips on weak utility feeds. The unit is version 1, and the control section can keep alarms and stored operating data available while the standby supply remains present.