Product Description:

The RD52.1-7N-088-D-V1-FW/S142 is a controller produced by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. It connects to a common DC link to modulate AC motor speed and torque in automated machinery such as conveyors, packaging lines, and material-handling axes. By accepting intermediate-circuit power, it executes closed-loop regulation commands from higher-level PLCs to keep induction or synchronous machines on programmed speed profiles and to maintain stable torque response during load changes. This arrangement suits multi-drive systems where the power section is supplied from a shared rectifier or central DC source instead of a dedicated mains input.

It is classified as a Drive Controller, and its modulation method uses field-oriented vector control; this approach manages current components independently so flux and torque channels respond quickly during transient load changes. A DC link supplied in Inverter DC form energizes the power section, while the permissible mains-rectified bus window of 530 to 670 V supports stable semiconductor switching. Heat is removed through a plug-through cooler up to 110 kW that projects the power module heat sink outside the cabinet, allowing airflow to bypass sensitive electronics during continuous duty. This cooling path also reduces the amount of heat released into the cabinet interior.

The power stage is supplied without a built-in brake chopper, so regenerative energy must be handled by an external resistor set or returned to the grid. The unit uses design generation 1, which retains legacy RD500 mounting dimensions for compatible cabinet layouts. This helps preserve existing panel cutouts and mechanical spacing in RD500 cabinets. Control electronics can remain active during mains isolation because the board accepts external 24 V stand-by power, allowing communication and status checks while the main power section is disconnected.