Product Description:

The RD51.1-5B-160-R-NN-FW is a drive controller produced by Bosch Rexroth Indramat and delivered within the RD 500 Drive Controllers series. In a multi-motor installation, this unit regulates the voltage and frequency supplied to induction machines so that speed and torque follow process commands. By combining power conversion, protection, and parameter handling in one compact assembly, it supports coordinated operation of conveyors, pumps, and fans over a standard automation bus. This arrangement is suited to industrial systems that need consistent motor control across several driven sections. It can be used where several motors must respond to the needs of a shared process without requiring separate standalone starters.

At the input stage, the controller accepts a three-phase supply through a three-phase AC converter input and is specified for a line range centered on 500 V. Its inverter section is rated for 160 kW of motor output, which suits medium-to-high power production machinery. The speed reference uses U/f curve control, so the voltage-to-frequency ratio remains constant and motor flux stays stable across the speed range. For rapid deceleration, a built-in brake chopper sends surplus DC-bus energy to an external resistor to help prevent overvoltage trips. This control approach is commonly used where reliable speed regulation is more important than highly dynamic positioning.

For continuous operation at this power level, heat is removed by liquid cooling with an internal pump, a method used on models above 132 kW to keep semiconductor temperatures within limits while reducing cabinet airflow demand. The unit belongs to Generation 1, so its parameter menus and slot layout follow the first design revision used in the RD 500 line. The base package does not include application-specific firmware, so the installed function set depends on the software selected for the required communication and control task. Optional additions such as extra I/O or technology functions are supplied with no optional extensions, leaving the standard hardware configuration available for later project-specific expansion.