RD51.2-4B-005-L-A1-FW Bosch Rexroth Indramat
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MPN: R911200987
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The Bosch Rexroth Indramat RD51.2-4B-005-L-A1-FW is a drive controller from the RD 500 Drive Controllers series and supports a rated power of 5.5 kW with a voltage range of 380 to 480 V. It features a built-in brake chopper with a continuous power rating of 2.8 kW, uses forced air cooling, and has an integrated mains filter. The controller offers IP20 protection and utilizes U/f curve control.
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Product Description:
The RD51.2-4B-005-L-A1-FW is a drive controller manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. The module accepts three-phase AC power and modulates motor speed through U/f curve control, allowing induction machines to follow commanded process profiles in automated conveyor, pump, or fan stations. A built-in brake chopper dissipates regenerated energy, while an integrated mains filter limits line-borne interference. Forced-air cooling keeps semiconductor temperatures stable, so the device is intended for installation inside protected control cabinets.
During continuous operation, the controller supplies a rated apparent power of 4.6 kVA at a rated current of 7 A and maintains output within a ±10% mains tolerance. The brake chopper can absorb 2.8 kW continuously and handle bursts up to 18 kW for one second, provided a 35 Ω external resistor is connected. Thermal management relies on air, and the blower must move 0.03 m³/s of cooling air through the heat sink channels. An enclosure rating of IP20 means the unit requires panel shielding against dust and accidental contact. For overload situations, it can deliver a peak apparent power of 6.0 kVA for sixty seconds before returning to nominal limits.
Supervisory features include standby power supplied externally and a starting lockout that inhibits unintended motor starts until the control circuit is enabled. This behavior helps prevent unexpected motion after power returns or control voltage is restored. At a 12 kHz switching frequency, the unit allows a peak of 9.1 A during short acceleration periods. Internal dissipation reaches 0.26 kW, so cabinet ventilation must expel that heat in addition to process losses. The unit is design generation 2 and has a fundamental power rating of 5.5 kW, covering medium-power loads fed from a mains window of 380 to 480 V. The self-contained brake circuitry reduces wiring and external component count.
Frequently Asked Questions about RD51.2-4B-005-L-A1-FW:
Q: Does the RD51.2-4B-005-L-A1-FW drive controller include a brake chopper?
A: The RD51.2-4B-005-L-A1-FW features a built-in brake chopper for controlled braking operations.
Q: What is the rated power output of the RD51.2-4B-005-L-A1-FW?
A: This model supports a rated power of 5.5 kW, making it suitable for moderate power applications.
Q: What type of control does the RD51.2-4B-005-L-A1-FW use?
A: The RD51.2-4B-005-L-A1-FW utilizes U/f curve control for speed and torque regulation.
Q: How is the RD51.2-4B-005-L-A1-FW cooled during operation?
A: Cooling for this drive controller is achieved using forced air, requiring a cooling air flow of 0.03 m3/s.
Q: What supply voltage does the RD51.2-4B-005-L-A1-FW require?
A: It operates with a supply voltage range from 380 to 480 V in a 3-phase AC configuration.
