AX2090-BW51-3000 Beckhoff
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The Beckhoff AX2090-BW51-3000 is part of the AX Digital Servo Drives series and weighs 8 kilograms. It provides 3000 W of power at 40°C with IP20 protection class and requires a vertical orientation with the terminal box facing downward. The unit features shielded cables and uses a potential-free normally closed switch contact with a switching current of 2 A.
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Product Description:
The AX2090-BW51-3000 brake resistor module is supplied by Beckhoff for use with the AX Digital Servo Drives series. It dissipates surplus regenerative energy from servo axes as heat, protecting the DC link and maintaining stable braking performance in automated machinery. The unit mounts separately from the servo drive and connects through dedicated brake terminals, providing a compact thermal sink for high-inertia loads.
At an ambient temperature of 40 °C, the resistor can continuously convert up to 3000 W of electrical energy into heat. Its resistance of 23.4 Ω sets the steady-state brake current that flows when the drive activates the dump circuit. The steel enclosure has an IP20 protection rating, permitting installation inside a control cabinet where unintentional contact is limited but airflow remains unrestricted. Thermal protection is provided by an internal switch that opens at 85 °C. The potential-free, normally closed contact is connected through control leads sized at 0.75 mm² (18 AWG). All control and sensor conductors are enclosed in a shielded cable to minimize electromagnetic interference. The assembly weighs 8 kg.
The module must be installed vertically with the terminal box facing downward. A minimum clearance of 200 mm is required at the bottom and sides, while a clearance of 300 mm must be maintained above the housing so rising air can carry heat away from the finned surface. When the ambient temperature exceeds 40 °C, the continuous power limit decreases by 4% per 10 K, which must be reflected in the drive parameters. Connection to the DC link is made with brake conductors sized at 2.5 mm² (12 AWG), and these wires should be routed separately from signal cables. The thermal switch can interrupt up to 2 A, allowing it to be wired in series with a ready input or safety relay without auxiliary contactors.
