The Npaq® 6U from Aerotech (Pittsburgh, PA) is a high-power drive rack that uses plug-in amplifiers supporting both linear and PWM topologies to control brushless, DC brush, or stepper motors. PWM amps offer up to 320 VDC operating voltage and 30 A peak current capability. Linear amplifiers provide up to 80 V and 20 A peak current for high power, low-noise applications. Featuring double-precision DSPs, the rack performs both current loop and servo-loop closures digitally. Closure rates up to 20 kHz are possible. The device handles digital and analog I/O processing, data collection, laser firing, and encoder multiplication tasks in real time.

Standard options include integrated encoder multiplication, per-axis brake control logic, I/O expansion, and integrated emergency stop circuitry. The device contains two configurable power supply sections rated at 600W each to support a variety of motors with different operating voltages. When only one motor voltage is required, the power supply sections are joined together. A dedicated Ethernet port communicates with third-party I/O modules for increased I/O count applications. It supports up to three axes of Position Synchronized Output (PSO) for synchronizing external devices, over-voltage shunt controller, and external fans for high-power operation.

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Motion Control & Automation Technology Magazine

This article first appeared in the April, 2014 issue of Motion Control & Automation Technology Magazine.

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