Product Description:

The RD51.1-4N-315-R-V1-FW drive controller is produced by Bosch Rexroth Indramat and belongs to the RD 500 Drive Controllers series. It is designed to supervise high-power asynchronous motors in production lines, presses, and large pumps. By varying the stator frequency and voltage, the unit supports controlled acceleration, deceleration, and steady-state operation while protecting connected machinery from supply disturbances. Its architecture also works with external PLCs through standardized interfaces, allowing coordinated axis control and process sequencing.

Its power section is rated at 315 kW, so the controller can drive motors up to that continuous output without thermal derating. The input network must remain within the 380 to 480 V range, matching common industrial feeders. The unit uses a 3 x AC converter topology that rectifies the three-phase line, builds a DC link, and inverts it back to a variable AC waveform for the load. Thermal energy from the switching stage is removed by liquid cooling with an internal pump, which minimizes cabinet heat and supports compact layouts in higher-power applications. Motor regulation follows U/f curve control, maintaining a proportional relation between voltage and frequency so torque remains available across the operating range.

To reduce conducted emissions, the controller carries an integrated mains filter, eliminating the need for separate line reactors. The unit tolerates line and load fluctuations of ±10 %, providing stable operation when mains conditions deviate from nominal. Dynamic braking energy must be handled externally because the unit is supplied without a built-in brake chopper; a separate chopper or regenerative module can be added if controlled stops are required. During plant outages, the logic circuitry can be kept alive through a connector for 24 V standby power, enabling monitoring and fault diagnostics while the main bus is off. The unit is part of design generation 1.