RD51.1-5B-004-D-DF-FW Bosch Rexroth Indramat
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MPN: R911203257
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The Bosch Rexroth Indramat RD51.1-5B-004-D-DF-FW is a drive controller that is part of the RD 500 Drive Controllers series. It features U/f curve control and a built-in brake chopper, and operates with a supply voltage of 500 V using a converter 3 x AC supply. This drive controller includes a plug-through cooler rated up to 110 kW and offers a NAMUR terminal strip with external 24 V stand-by power.
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Product Description:
The RD51.1-5B-004-D-DF-FW is a drive controller produced by Bosch Rexroth Indramat and assigned to the RD 500 Drive Controllers series. Installed between the mains supply and an AC induction motor, it converts fixed-frequency three-phase power into a variable output that regulates motor speed and torque. This makes the unit suitable for conveyor sections, pump stations, and other material-handling axes in automated plants. Because the output frequency can be adjusted to match process demand, the connected motor can start smoothly and run at the required operating point without direct line switching. It can be used in retrofit panels as well as newly engineered machines that require dependable electrical motion control.
It uses a 3 × AC converter arrangement and is intended for mains systems in the 500 V class. Thermal stability is supported by a plug-through cooler that transfers switching-device heat directly to the rear panel, helping the drive support continuous operation up to 110 kW without additional cabinet fans. Speed regulation is based on U/f curve control, which keeps the ratio between stator voltage and frequency consistent so motor flux remains stable at low speeds. This control method is commonly used where steady speed behavior is needed across a broad operating range. During braking, the built-in brake chopper directs excess DC-bus energy to an external resistor to limit overvoltage and reduce stopping time.
For plant wiring, the control board includes a NAMUR terminal strip for connection to process limit switches. An external 24 V standby power input keeps parameter memory and fieldbus nodes active when the main supply is off. This allows the control section to remain available during supply interruptions instead of shutting down completely with the power stage. Drive monitoring is supported by current filter feedback (U6, V6, W6), which returns real-time filter values to a supervisory PLC for status monitoring. The unit is Generation 1, identifying it as part of the first design release.
Frequently Asked Questions about RD51.1-5B-004-D-DF-FW:
Q: What braking feature is included in the RD51.1-5B-004-D-DF-FW drive controller?
A: The RD51.1-5B-004-D-DF-FW features a built-in brake chopper for dynamic braking operations.
Q: What type of control method does the RD51.1-5B-004-D-DF-FW utilize?
A: This model uses U/f curve control to manage the relationship between voltage and frequency for motor control.
Q: What cooling method is used in the RD51.1-5B-004-D-DF-FW drive controller?
A: The RD51.1-5B-004-D-DF-FW is equipped with a plug-through cooler for efficient heat dissipation up to 110 kW.
Q: What type of terminal strip and stand-by power does the RD51.1-5B-004-D-DF-FW offer?
A: A NAMUR terminal strip with external 24 V stand-by power is available on this drive controller.
Q: What is the supply type and voltage range for the RD51.1-5B-004-D-DF-FW?
A: This drive controller is designed to operate on a 3-phase AC supply with a voltage range of 500 V.
