Product Description:

The RD51.1-4N-015-L-D1-FW is a drive controller manufactured by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. It is intended for integration into automated machinery where it converts three-phase mains power into a regulated output for induction motors, enabling speed and torque adjustment without mechanical gear changes. This makes it suitable for conveyors, pumps, fans, and other variable-speed equipment. It also supports processes that need smooth acceleration and stable operation under changing load conditions.

This controller uses U/f curve control, meaning the output frequency is modulated in direct proportion to voltage so the motor flux remains constant during acceleration or load shifts. Thermal management relies on forced air cooling, and an internal fan channels airflow across heat-generating components to keep the power stage within operating limits. The drive delivers a continuous output of 15.0 kW, which is the maximum continuous motor power under nominal conditions. It accepts line voltages from 380 to 480 V, covering common industrial three-phase grids, and maintains performance with a line fluctuation of ±10 %, helping prevent nuisance trips when supply levels drift within that range.

The supply topology is a Converter 3 x AC, so the rectifier and inverter sections are combined in one unit for straightforward cabinet wiring. For braking events, it is delivered without a built-in brake chopper, so external chopper hardware is required if rapid energy dissipation is needed. Line-side compliance is supported by the integrated mains filter, which attenuates conducted EMI to protect neighboring equipment. Control wiring is grouped on a NAMUR terminal strip, and a 24 V standby input keeps the logic circuits active during mains isolation.