Product Description:

The AX8620-0000 is a servo drive module produced by Beckhoff for the AX Digital Servo Drives series. Designed for multi-axis automation, it rectifies incoming mains power, builds a DC link, and delivers pulse-width-modulated voltage to synchronous or asynchronous motors. The unit regulates torque, velocity, and position while exchanging status data with higher-level PC-based controllers through the manufacturer’s EtherCAT interface.

Within the power stage, a 405 µF DC link capacitor smooths regenerated energy, and the bus is allowed to rise to 848 VDC during normal operation. Surplus energy is dissipated through the internal brake circuit, which supports 75 W of continuous thermal loading and withstands peaks up to 21.8 kW. The drive requires a brake resistor of at least 33 Ω, which helps prevent transistor overstress in the shunt path. Mechanical integration is simplified by the 60 mm width, 192 mm depth, and 230 mm height, permitting dense cabinet layouts. Single-phase installations at 240 VAC can draw 10 A to produce 2 kW of motor power, whereas three-phase grids supply the bus more efficiently at 17.5 A.

For applications that demand higher braking capacity, the drive can route energy to an external resistor bank capable of 1.6 kW of continuous dissipation, allowing longer decelerations without triggering overvoltage faults. The shared DC link may feed several axes as long as their combined current does not exceed 20 A, maintaining thermal balance across the module set. When connected to a 400 VAC three-phase supply, the device can deliver 10.7 kW of usable shaft power while still conforming to a 65 kA short-circuit rating specified for feeder protection. Reliable service is maintained at ambient temperatures up to 55 °C, enabling enclosure designs without active cooling in many environments.