RD51.1-4N-022-L-C1-FW Bosch Rexroth Indramat
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MPN: R911200555
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The Bosch Rexroth Indramat RD51.1-4N-022-L-C1-FW is a drive controller belonging to the RD 500 Drive Controllers series. It has a rated power of 22 kW, uses U/f curve control, and accepts a voltage range from 380 to 480 V. The unit features forced air cooling and includes an integrated mains filter.
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Product Description:
The RD51.1-4N-022-L-C1-FW drive controller is produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a converter-based unit, it supplies adjustable output for induction motors, allowing speed and torque control in conveyors, pumps, and similar machinery. The controller sits between the plant supply and the motor, where it regulates delivered power in response to commands from a higher-level control system. This arrangement lets the drive support stable motor operation across changing load conditions without requiring a fixed-speed connection. Because output frequency is controlled electronically, the same machine can run at speeds matched to process demand instead of being limited to direct line frequency.
The unit accepts three-phase input power and operates as a 3 x AC converter. Its permissible line voltage range is 380 to 480 V, and it tolerates variation of up to ±10 % without loss of normal function on common industrial supplies. At the motor side, the controller is rated for a continuous output of 22 kW, which suits medium-power process equipment and general plant drives. It uses U/f curve control, keeping the voltage-to-frequency relationship proportionate as operating frequency changes so standard induction motors maintain stable magnetic flux. This control method is commonly used where dependable speed adjustment is needed without the added complexity of more advanced motor-control schemes.
The controller is supplied without a built-in brake chopper, so braking energy must be handled by an external resistor or returned through the system arrangement. Heat is removed by forced air cooling, which means cabinet airflow has to remain clear along the heat sink passages during operation. An integrated mains filter helps reduce conducted electrical noise on the supply connection. The unit also provides 24 V stand-by power for the control electronics, allowing communication functions and stored settings to remain available when the main input is isolated. Keeping the stand-by supply active can also preserve interface availability during planned shutdowns or upstream isolation.
