Product Description:

The RD52.1-4B-004-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It interfaces between a three-phase mains supply and an induction or synchronous motor, converting and regulating power so that plant machinery can follow commanded speed or torque profiles with repeatable accuracy. Used in automated cells, conveyors, and process equipment, the device executes closed-loop current and voltage control to keep the connected motor stable under changing mechanical loads. This helps maintain smooth operation during acceleration, deceleration, and normal load changes.

The controller uses field-oriented vector control so stator currents are aligned with the rotor’s magnetic field, enabling precise torque response from zero speed to base frequency. Thermal limits are managed by forced-air cooling; a rear-mounted fan draws cabinet air through the heat sink to remove switching losses generated by the IGBTs. Dynamic stopping energy is dissipated internally by a built-in brake chopper, reducing the need for an external resistor module in most mid-power applications. The power section accepts a mains window of 380 to 480 V, letting one hardware type cover standard 400 V and 460 V plant utilities. To reduce conducted emissions, an integrated mains filter attenuates high-frequency noise before it reaches the facility bus.

The input tolerates line variations of ±10%, so brief sag or swell events do not trip the drive. As a 3 × AC converter, it rectifies and inverts three-phase power rather than relying on a DC feed, simplifying installation wherever only AC is available. For control electronics, a 24 V standby power terminal keeps the logic active during mains isolation, supporting communication and parameter access. The unit is in design generation 1, indicating the first design version of this controller type.