Product Description:

The RD51.1-7N-018-L-NN-FW is a modular drive controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. As a closed-loop power stage, it interfaces with induction or synchronous motors to regulate speed and torque in automated process lines, conveying systems, and machine tools. Intended for integration on the DC link of a front-end rectifier, it converts the intermediate circuit voltage into a variable AC output that matches motor requirements and minimizes mechanical stress during acceleration or deceleration. This arrangement helps reduce abrupt electrical and mechanical transitions during routine speed changes.

In operation, the RD51.1 model draws its DC link energy from an upstream converter with an Inverter DC supply. The permissible intermediate circuit spans 530 to 670 V, providing headroom for mains variations while maintaining full output. Its mechanical fan pack provides Forced air cooling, so the unit can dissipate heat while delivering a continuous output of 18.5 kW. Motor flux is regulated by U/f curve control, allowing the controller to maintain constant torque in the lower speed range without sensor feedback. This operating profile suits constant-torque conveyors, mixers, and pumping duties where fixed ratios of voltage to frequency are acceptable.

This hardware belongs to design revision Generation 1 and uses the mechanical layout and interface board set assigned to that version. Because it is supplied without a built-in brake chopper, external dynamic braking hardware must be added when the connected load demands rapid stops that exceed the drive's natural dissipation capacity. The option board slot is not equipped, leaving space for application-specific I/O or communication modules. The required software is ordered as a separate subposition so the feature set can be matched to the installed hardware.