Product Description:

The RD52.1-7N-110-W-V1-FW/S129 is a drive controller manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. It serves as the closed-loop motor control element in industrial automation, receiving DC link energy and producing variable-frequency, variable-voltage output that synchronizes induction or synchronous motors with process demands. Its 19-inch module format suits rack-based installations used in centralized drive cabinets, where multiple power components are arranged in a compact enclosure.

This controller operates on an inverter DC link and can draw from a bus within the 530 to 670 V window, which is the permissible range for stable pulse-width modulation. Internal regulation relies on field-oriented vector control, a current-model algorithm that separately controls torque-producing and flux-producing components for fast response. Thermal management is handled by liquid cooling, allowing heat to be transferred directly to a coolant circuit rather than into the cabinet air path. The unit can support motor output up to 110 kW during continuous operation, so associated conductors and protective devices must match that power level. Because the supply type is inverter DC, the controller is intended for a rectified and smoothed input instead of raw mains power.

No brake dissipation circuitry is mounted on the power board, and the unit is supplied without built-in brake chopper, so external chopper modules are needed when regenerative peaks exceed DC link absorption capacity. Control electronics remain powered by an auxiliary line that provides 24 V stand-by power, enabling monitoring and parameter retention during main power isolation. The unit belongs to design generation 1, which supports compatibility with early RD 500 option cards and cabling sets. The suffix S129 identifies the separately selected software package for this hardware version.