Product Description:

The RD51.1-4N-160-F-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The unit conditions three-phase line power and controls an induction motor so automated machines can vary speed, torque, and direction under PLC command. By delivering regulated voltage and frequency, it supports precise acceleration ramps, protects the motor from overcurrent, and reduces mechanical wear in pumping, conveying, and mixing equipment across industrial facilities. Its compact modular housing allows mounting inside standard switchgear enclosures while maintaining clear access to control terminals and fieldbus adapters.

The controller employs U/f curve control, which maintains a proportional relationship between output voltage and frequency so the motor’s magnetic flux stays constant from standstill to base speed. A continuous power capacity of 160 kW makes the unit suitable for heavy loads such as centrifugal compressors. It accepts a supply range of 380 to 480 V, and an input variation of ±10 % is tolerated without derating, allowing operation on weak or long feeder lines. Thermal energy is removed through integrated forced-air cooling with liquid circulation; fans move cabinet air across heat sinks bonded to a coolant plate, keeping semiconductor temperatures within safe limits during full-load duty.

For line interfacing, the drive uses a 3 × AC converter rectifier-inverter topology that helps isolate the motor from mains harmonics and supports braking with an external resistor module. Control electronics remain active through 24 V standby power, allowing diagnostics and communication to continue even when the primary bus is isolated. An integrated mains filter suppresses conducted emissions and simplifies EMC compliance at the panel level. Because the unit ships without a built-in brake chopper, excess energy generated during rapid deceleration must be routed to an external braking module or a regenerative supply unit.