Product Description:

The RD51.1-4N-055-L-V1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. The device conditions three-phase power and issues variable-frequency output so that induction motors follow commanded speed and torque profiles. By matching motor demand to process requirements, the controller supports energy-efficient operation and can help reduce wear in automated conveyor, pumping, and material-handling systems.

This model delivers a rated output of 55 kW, which is suitable for mid-range production machinery. Its supply range is 380 to 480 V three-phase AC, and a line tolerance of ±10 % allows the drive to remain stable during typical plant voltage fluctuations. Because it is a 3 x AC converter, no additional rectifier is required at the mains connection. The control method uses U/f curve control, so motor flux stays proportional across the speed range as voltage is adjusted with frequency. This open-loop method is well suited to applications that do not require encoder feedback but still need predictable torque performance. The product is a drive controller in design generation 1. Firmware is ordered as a separate subposition so the software package can be matched to the selected motor and fieldbus options.

Thermal management relies on forced-air cooling, and an internal fan directs airflow along the power components to clear heat from the sinks. The unit is supplied without a built-in brake chopper, so dynamic braking energy must be handled through the DC bus of a companion module when rapid stops are required. For the control electronics, the front end provides external 24 V stand-by power, which keeps parameter memory and fieldbus nodes active during main power interruptions. An integrated mains filter attenuates conducted emissions, helping the installation meet electromagnetic compatibility guidelines.