Product Description:

The RD51.1-5B-015-D-CF-FW is a drive controller produced by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It converts three-phase mains power into regulated motor voltage and frequency so induction motors can be used in pumps, fans, conveyors, and similar automation equipment. By monitoring line conditions, the controller adjusts its output according to a preset voltage-to-frequency curve and supports stable speed control across a broad operating range. Dynamic braking is handled through an internal chopper circuit, which helps the unit manage energy during deceleration. This operating method is well suited to variable-speed applications that need dependable motor control without closed-loop servo feedback.

A dedicated factory-installed brake stage is included as a built-in brake chopper. The output profile uses U/f curve control, so motor voltage increases with commanded frequency for predictable operation on standard squirrel-cage motors. Continuous shaft power is limited to 15.0 kW, which places the unit in a medium-power range for industrial drive tasks. Incoming supply must remain at 500 V, and the mains interface uses a three-phase AC converter so the electrical load is shared across all phases. This control approach is commonly used where straightforward frequency-based motor regulation is preferred for general-purpose machinery.

Thermal management is handled through a plug-through cooler for drives up to 110 kW, which places the heat sink outside the cabinet to reduce internal heat buildup. This arrangement can lower the thermal load inside the enclosure and help maintain more stable cabinet temperatures during continuous operation. The hardware belongs to design generation 1, which matches the first RD500 platform for compatible option cards and keypad modules. Application flexibility is extended by the combination C1 + F1 function package, which supports basic speed control and feedback-independent frequency functions for straightforward process operation. The control electronics use software ordered separately, allowing the operating package to be selected for the intended machine task.