Product Description:

The RD51.2-5B-015-L-A2-FW is manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. As a drive controller, it conditions incoming three-phase power and delivers regulated output to standard asynchronous motors in industrial automation cells. Its modular power section shares mechanical dimensions with other units in the series, which helps simplify cabinet layouts. It fits conveyor, pump, and fan systems where constant-torque operation with variable speed is required. This operating profile suits machines that need adjustable throughput and smooth motor response during routine process changes.

At a rated power of 15.0 kW, the controller is sized for medium-duty motors used in material handling and process equipment. It accepts mains through a three-phase AC converter supply and operates across a line window centered on 500 V. During rapid deceleration, the integrated built-in brake chopper diverts excess DC-link energy to external resistors, limiting bus overvoltage trips. Thermal management relies on forced air cooling, so the mounting location must allow unobstructed airflow through the heat sink channel. Proper clearance also helps preserve the expected service life of the fan assembly. This power class supports medium-duty applications without moving into larger inverter sizes.

Speed regulation follows the U/f curve control method, which maintains a constant voltage-to-frequency ratio so standard squirrel-cage motors can produce linear torque without encoder feedback. This approach is well suited to applications where stable speed adjustment is more important than servo-style positioning. The unit is in design generation 2, so its parameter structure and option cards match the second RD 500 platform revision. Functional extras include external standby power, which keeps the keypad active from an auxiliary supply, and a starting lock-out feature that blocks unintended energization after a fault is cleared.