AX2516-B750 by Beckhoff

The AX2516-B750 is a single-axis drive module manufactured by Beckhoff within the AX Digital Servo Drives series. Designed for cabinet installation, the unit interfaces with motion controllers to regulate motor voltage and current for positioning, speed, or torque control in automated machinery. By monitoring feedback and processing control words through its internal DSP, the drive provides dynamic regulation while supplying brake power through a dedicated output stage. Its design supports analog and discrete I/O, allowing machine builders to connect sensors, enable circuits, and brake circuits directly to the same housing.

The continuous power channel supports a maximum installed load of 12 kVA, giving the drive sufficient capacity for motors in the mid-power class. Under nominal conditions, it supplies a phase current of 6 A RMS. During acceleration or sudden load changes, it can deliver a short-term surge of 12 A RMS without exceeding its thermal limits. Current loops close every 125 µs because the PWM module operates at a carrier frequency of 8 kHz, which limits ripple and audible noise. Command values can arrive over ±10 V analog lines that are digitized at 14-bit resolution, allowing fine speed adjustment and torque sharing in multi-axis gantries. The permissible load inductance ranges from 7.5 mH to 40 mH, so the drive can energize windings with different magnetic designs without losing stability.

Protective functions are integrated into the drive. If the DC-link voltage rises above 750 V, an electronic switch disconnects the transistor bridge to prevent insulation breakdown. The housing meets the IP20 protection classification, restricting access to hazardous internal components with a finger. Two optically isolated outputs can operate interlocks, and each channel is rated at 30 V DC and 10 mA, allowing it to energize feedback LEDs or PLC inputs without external relays. When idle, the electronics consume only 15 W, which reduces panel heat and simplifies convection cooling calculations for compact enclosures. The holding brake circuit can supply 1.5 A. Relay contacts for the STO paths are rated at 30 V DC or 42 V AC and 500 mA.