Product Description:

The ACJ-055-18 is a compact DC servo drive released by Copley Controls within the Accelnet CANopen Modules series. The module conditions bus power and converts it into PWM-controlled motor phases, letting machine builders regulate torque, speed, or position on brushless or brushed servomotors through the CANopen fieldbus. By integrating current, velocity, and position loops onboard, it removes the need for bulky analog amplifiers and supplies distributed axis control in packaging equipment, semiconductor tooling, and general motion platforms.

Drive capability begins with a continuous phase current of 6 A DC, enough to maintain rated torque on moderate-inertia axes, while a peak burst of 18 A DC handles acceleration or transient load spikes. Power processing mirrors these current limits; the converter can deliver 323 W continuously and rise to 970 W during short overloads. Heat sinks and cabling must be sized for both operating conditions to prevent excessive temperature rise and voltage drop. The dual-shunt current loop refreshes at 15 kHz, matching the switching PWM frequency to minimize phase lag between commanded and delivered torque.

Precise feedback handling supports encoder signals up to 20 MHz on the quadrature count channel, while line-frequency tracking is aided by digital filters so high-resolution encoders operate without losing counts. A thermal sensor removes power if the internal heat spreader reaches 70 °C, protecting semiconductors during stalled-motor events. Position and speed loops close at 3 kHz, a rate fast enough to damp resonance on lightly coupled stages yet slow enough to avoid control noise. The housing measures 97.28 × 62.74 × 32.77 mm, allowing the drive to mount beside motors inside tight enclosures and share airflow paths with other motion electronics.