Product Description:

The RD51.1-5N-315-R-V1-FW/S138 belongs to the RD 500 Drive Controllers series produced by Bosch Rexroth Indramat. As a high-capacity drive controller, it links the plant power supply to large three-phase induction motors and modulates frequency so that conveyor lines, mixers, or compressors can run at commanded speeds under closed-loop supervision. Within an automated cell, it functions as the main power interface, translating control-system references into the voltage and frequency that match the motor’s magnetic characteristics. This type of controller is typically used where a process needs smooth acceleration, regulated speed, and stable operation under changing mechanical load.

The unit is rated for 315 kW, indicating the maximum continuous mechanical output it can deliver to the attached motor shaft. Incoming energy is supplied through a 3 x AC converter topology, so all three phases are rectified and processed before inversion to the desired output. Speed variation is achieved with U/f curve control; by keeping the volts-to-hertz ratio constant, the drive preserves motor flux across the operating range. The DC link and power section are sized for an input supply centered on 500 V, matching common industrial distribution levels. Thermal management relies on liquid cooling with an internal pump, a closed circuit that removes heat from the power semiconductors and supports operation at the stated power level.

No energy-dissipating chopper is built in, so regenerative peaks must be handled externally; this feature is identified as without built-in brake chopper. In applications with frequent deceleration or overrunning loads, an external braking solution is therefore required to absorb returned energy safely. The hardware revision is 1. For logic preservation during line-power loss, the controller accepts 24 V standby power, allowing fieldbus links and parameter memory to remain active during a temporary loss of the main supply.