RD51.2-5B-018-L-A1-FW Bosch Rexroth Indramat
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MPN: R911203433
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The Bosch Rexroth Indramat RD51.2-5B-018-L-A1-FW is a drive controller from the RD 500 Drive Controllers series. It features a built-in brake chopper and uses U/f curve control. The controller supports a rated power of 18.5 kW and operates with a 500 V converter 3 x AC supply.
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Product Description:
The RD51.2-5B-018-L-A1-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Installed between a three-phase supply and an induction motor, it modulates output voltage and frequency so the motor follows the commanded speed and torque profile required by automated machinery. The unit mounts inside a control cabinet, accepts logic commands from higher-level controllers, and delivers the power conversion functions needed for coordinated motion and process control. This arrangement allows the drive to vary motor speed smoothly, maintain stable operation under changing load, and support applications that need controlled acceleration and deceleration.
The power section is designed for three-phase AC converter input supplies within a nominal line window of 500 V, and it can deliver up to 18.5 kW of mechanical power to the connected load. Regulation follows a U/f curve control profile, so output voltage rises with frequency to keep motor magnetization in a usable range without closed-loop vector regulation. This operating method suits general-purpose variable-speed duties where simple speed control is needed and the motor does not require high-dynamic servo behavior. Continuous thermal management is handled by forced air cooling, where an integrated fan moves airflow across the heat sink to keep power components within their allowable temperature range during sustained current flow.
During deceleration, the integrated protection stage uses a built-in brake chopper that diverts regenerated energy to an external resistor instead of feeding it back to the mains. The control platform belongs to generation 2, and its interface arrangement supports option cards intended for the same product generation. Service functions include external standby power and a starting lockout relay, which allow the control section to remain available for status handling while motor startup can be inhibited when required. These functions support controlled restart behavior and help separate auxiliary control availability from main power conversion.
Frequently Asked Questions about RD51.2-5B-018-L-A1-FW:
Q: Does the RD51.2-5B-018-L-A1-FW include a built-in brake chopper?
A: The RD51.2-5B-018-L-A1-FW features a built-in brake chopper for effective braking operations.
Q: What control type does the RD51.2-5B-018-L-A1-FW utilize?
A: This drive controller uses U/f curve control for drive operation.
Q: What cooling method is used in the RD51.2-5B-018-L-A1-FW drive controller?
A: The RD51.2-5B-018-L-A1-FW employs forced air cooling to maintain optimal operating temperature.
Q: What is the rated power of the RD51.2-5B-018-L-A1-FW drive controller?
A: This model delivers a rated power output of 18.5 kW for connected equipment.
Q: What supply type and voltage range does the RD51.2-5B-018-L-A1-FW require?
A: The RD51.2-5B-018-L-A1-FW operates on a three-phase AC supply with a voltage range of 500 V.
