AX2090-BW51-3000 by Beckhoff

The AX2090-BW51-3000 is a drive accessory designed for the Beckhoff AX Digital Servo Drives series. It is installed inside automation control cabinets and works with the associated servo hardware to manage power-related functions during dynamic machine cycles. The device must be mounted vertically with the terminal box pointing downward. Beckhoff requires 200 mm of free space below the housing and on each side, along with 300 mm above it, to maintain unrestricted airflow in this orientation.

When the ambient temperature is held at 40 °C, the module can continuously dissipate up to 3000 W of thermal energy. Above that temperature, the allowable load decreases by 4% per 10 K. Its internal resistor measures 23.4 ?, which determines the current drawn during each braking or energy-dissipation event. The enclosure meets the IP20 protection class, so it prevents accidental finger contact with live parts while remaining open to cabinet ventilation. An integrated temperature switch opens at 85 °C to prevent overheating, giving the control system time to reduce drive activity or initiate a controlled stop.

The assembly weighs 8 kg, allowing direct mounting on control-panel backplates without additional support brackets. Control wiring for the temperature switch uses conductors measuring 0.75 mm² (18 AWG). The brake connection is routed through shielded leads measuring 2.5 mm² (12 AWG) to carry the higher pulse currents. The potential-free, normally closed contact of the switch can interrupt up to 2 A, making it compatible with typical Beckhoff safety inputs. Cable shielding limits electromagnetic emissions, while the required clearances help prevent neighboring devices from being exposed to heat generated during repetitive braking cycles.