Product Description:

The AX8640-0000 digital servo drive is produced by Beckhoff within the AX Digital Servo Drives series. It serves as a four-axis power stage that rectifies three-phase mains, stabilizes the DC link, and delivers precisely modulated current to servo or induction motors. By integrating position feedback from an external controller, the drive executes synchronized acceleration, deceleration, and holding functions required in packaging equipment, automated storage systems, and metal-cutting centers. Cabinet space is conserved through a 90 mm width, 230 mm height, and 192 mm depth, while aluminum heat-sink construction keeps the 3.5 kg housing within acceptable enclosure temperatures during continuous duty.

The DC bus can rise to 848 VDC, which is the maximum permissible intermediate-circuit voltage before overvoltage protection trips. On the line side, the drive has a rated input current of 35 A AC for base-load operation, and it can momentarily draw 70 A when motors accelerate simultaneously. Motor windings may receive a peak output of 80 A DC for dynamic moves, whereas the sustained output remains at 40 A to limit thermal stress. Mechanical shafts can be driven with up to 21.4 kW of continuous power from a 400 VAC supply, allowing sizeable inertia loads to be handled without additional drives. Basic self-consumption is held to 8 W, and overall dissipation follows a ratio of 6 W per delivered kilowatt, which simplifies enclosure cooling calculations.

An internal chopper dissipates braking energy at 125 W continuously, permitting frequent regenerative cycles without external hardware, provided the connected resistor is no lower than 18 Ω. Energy storage inside the intermediate circuit is supplied by a 625 µF capacitor bank, which filters ripple and stabilizes voltage during sudden current changes. The drive meets a fault withstand rating of 65 kA, allowing it to remain in service on high-capacity feeder panels commonly found in industrial plants. These values describe the braking, filtering, and short-circuit limits that apply during normal operation.