Product Description:

The RD52.1-4N-090-L-V1-FW is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The device receives three-phase AC power, rectifies it, and inverts the energy into controlled output for industrial motors, so it acts as the regulating element in automated conveyors, mixers, and gantry axes. Integrated into a PLC-based line, the controller enables closed-loop velocity and torque commands that keep production equipment synchronized while limiting mechanical wear. It also allows motor speed to follow changing process demand without relying on fixed mechanical ratios.

During service, it can deliver up to 90 kW of motor power, supporting mid-range pumps and extruders. The input section accepts a line window of 380 to 480 V, covering common low-voltage networks in manufacturing plants. Classified as a three-phase AC converter, the unit draws balanced current from all phases and feeds a stable DC link for inversion. Precise shaft control is handled by field-oriented vector control, which separates flux and torque components for fast settling after load changes. Internal heat is removed through forced air cooling, and a dedicated fan moves ambient air across heat sinks so semiconductor junctions remain within a safe temperature range. The unit is design generation 1, and the application software is selected separately for the required control task.

An integrated mains filter suppresses conducted emissions and helps protect upstream devices from high-frequency noise. Voltage variations of up to ±10 % can be tolerated, allowing stable operation on lightly regulated feeders. The power section is supplied without a built-in brake chopper, so applications that need dynamic braking must use an external resistor or regenerative module. For logic circuits, the unit employs 24 V standby power, keeping the control electronics energized during mains outages so status messages and fieldbus communication can remain active. That behavior helps the higher-level control capture faults and manage a controlled stop if input power drops unexpectedly.