Product Description:

The AX2090-BW51-1000 is a brake resistor unit supplied by Beckhoff for use with the AX Digital Servo Drives series. When a servo axis regenerates energy, this module absorbs the excess and protects the DC link from overvoltage, making it a standard accessory in machine tools, packaging lines, and material-handling systems. The device is intended as an external, panel-mounted component that connects directly to the drive’s dedicated brake resistor port.

Its resistance is 23 Ω, which sets the current drawn from the DC bus during dynamic braking. The resistor can convert up to 1000 W of thermal power on a continuous basis, and this rating helps determine suitable deceleration ramps. A micro-thermostat integrated into the housing opens at a switching temperature of 180 °C and uses a normally closed contact so the controller can trigger a fault before critical heating occurs. The thermal circuit carries a maximum switching current of 2 A. For electrical safety, the enclosure has a protection class of IP20, which prevents finger contact and blocks solid objects larger than 12.5 mm while still allowing ventilation. Connection to the drive is made through port X2, and the thermostat returns through plug X06.

Installation clearance includes 200 mm below the unit, 200 mm on each side, and at least 300 mm above the housing so natural convection can remove heat. The module weighs 4 kg, which should be considered when sizing cabinet rails or mounting hardware. Beckhoff recommends shielded cabling, with the brake line using conductors of 2.5 mm² and the thermostat loop using 0.75 mm² cores. These wires should be kept as short as possible to reduce inductive voltage spikes. The braided shield reduces electromagnetic interference inside densely populated drive cabinets and supports compliance with EMC guidelines.