Product Description:

The RD52.1-4B-110-L-F1-FW is manufactured by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It is installed in cabinet-based conversion panels to command AC motors used on conveyors, extruders, or press lines. By modulating the stator frequency and voltage, the unit allows precise acceleration, stable speed holding, and controlled braking within automated production cells. This operating method lets the drive adapt motor output to changing process demands without requiring the motor to run at full speed during every part of the cycle.

The power section is rated at 110 kW, meaning the inverter can supply that continuous mechanical load without thermal derating when ambient ventilation is adequate. Incoming mains between 380 to 480 V are accepted, and the control electronics compensate for line variation within a tolerance of ±10 % to help maintain stable DC-link voltage. Because the supply connection uses a 3 x AC converter arrangement, the controller expects a symmetrical three-phase source and returns balanced currents to the distribution network. Current feedback from terminals U6, V6, and W6 is routed to the drive logic so that instantaneous phase currents can be monitored for fault detection and dynamic torque regulation. This feedback also helps the controller respond quickly when load conditions change during starts, speed changes, or braking events.

Speed and torque loops are executed with field-oriented vector control, giving the application fast transient response and low steady-state error. A built-in brake chopper is connected across the DC bus to dissipate regenerative energy during rapid deceleration, which helps prevent overvoltage trips when a driven load forces energy back into the inverter. Heat produced by the power semiconductors is removed through forced-air cooling, so cabinet airflow planning is required to keep internal temperatures within the intended operating range. To reduce conducted emissions and meet EMC targets, an integrated mains filter is included in the housing. This unit is classified as Design Generation 1, indicating the first design generation of this version. The combination of current feedback, vector control, regenerative energy handling, and active cooling supports stable motor operation across varying process conditions.