Product Description:

The RD51.1-5N-007-L-C1-FW is a drive controller introduced by Bosch Rexroth Indramat as a member of the RD 500 Drive Controllers series. Designed for plant automation, the unit connects to three-phase induction motors to adjust frequency and voltage and manage motor speed in conveyor lines, pumps, and similar equipment. It performs this role while occupying a compact cabinet footprint suitable for retrofit or new installations, providing the electrical conversion and protective monitoring needed for continuous-duty industrial service.

In operation, the controller uses U/f curve control, so the output voltage rises in proportion to frequency. This scalar method is appropriate for constant-torque tasks where closed-loop vector feedback is not required. The power stage is designed for a three-phase supply centered on 500 V, and it can deliver up to 7.5 kW of motor output when matched with an appropriate machine load. Thermal management is maintained by forced air cooling, so fans move air across the heat sink to keep semiconductor temperatures within permissible limits during full-load cycles. Because the drive is supplied without a built-in brake chopper, dynamic braking energy must be dissipated through an external resistor or regenerative module connected to the DC link.

Power entry follows a 3 x AC converter topology, meaning the unit rectifies and filters three-phase input power before synthesizing a variable AC output. A dedicated auxiliary circuit supplies 24 V standby power, allowing the control electronics to remain active for fieldbus communication or fault diagnostics when the main power stage is off. This version is identified as design generation 1 and uses the mechanical dimensions and interface layout shared across early RD 500 variants. Application software is not embedded at shipment, and the required program set is ordered as a separate subposition.