RD51.1-4B-055-W-C1-FW Bosch Rexroth Indramat
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MPN: R911203042
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The Bosch Rexroth Indramat RD51.1-4B-055-W-C1-FW is a drive controller from the RD 500 Drive Controllers series. It features U/f curve control, a built-in brake chopper, and operates with liquid cooling. This controller supports a rated power of 55 kW, accepts a voltage range of 380 to 480 V, and includes an integrated mains filter.
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Product Description:
The RD51.1-4B-055-W-C1-FW drive controller is produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It is installed between the mains and an AC motor so that speed, torque, and energy use follow programmed setpoints in continuous-duty automation lines. As a dedicated variable-speed component, it converts fixed-frequency utility power into a variable frequency and voltage pair tailored to the connected machine. This allows the motor to respond to changing process demand without relying on mechanical speed changes. It is suited for pumps, fans, and conveyor drives used across manufacturing and process plants.
This controller is rated for 55 kW of output and is designed for a three-phase mains window of 380 to 480 V. The incoming power is handled by a three-phase AC converter front end, after which the internal control algorithm issues the commanded frequency. Because the regulation method is U/f curve control, the output voltage remains proportional to frequency so the connected induction motor maintains constant flux over the operating speed range. This approach is commonly used where stable motor behavior is needed across varying load conditions. A built-in brake chopper is mounted on the DC link, and it redirects regenerated energy to an external resistor during rapid braking to help prevent overvoltage trips.
Thermal management relies on liquid cooling, which transfers losses to a closed water circuit and permits full power within compact cabinets. An integrated mains filter reduces conducted electromagnetic interference, so additional line components are often unnecessary. The input voltage may deviate by ±10% without changing normal drive operation, which is useful when long cables or soft-start transformers are present. For control electronics, the unit supports 24 V standby power, allowing communication and parameter access when the main supply is disconnected. This model belongs to design generation 1 and is intended for cabinet-mounted industrial drive systems.
Frequently Asked Questions about RD51.1-4B-055-W-C1-FW:
Q: Does the RD51.1-4B-055-W-C1-FW include a brake chopper?
A: The RD51.1-4B-055-W-C1-FW drive controller has a built-in brake chopper for handling regenerative energy during braking operations.
Q: What type of control does the RD51.1-4B-055-W-C1-FW drive provide?
A: This model uses U/f curve control as its standard control method.
Q: What cooling method is used in the RD51.1-4B-055-W-C1-FW drive controller?
A: The RD51.1-4B-055-W-C1-FW utilizes liquid cooling for heat dissipation during operation.
Q: What is the rated power of the RD51.1-4B-055-W-C1-FW drive controller?
A: This drive controller is rated for 55 kW of output power.
Q: What is the voltage range and supply type required for the RD51.1-4B-055-W-C1-FW?
A: It operates on a voltage range from 380 to 480 V with a supply type of Converter 3 x AC.
