Product Description:

The ASC-055-18 is a compact DC-input servo amplifier produced by Copley Controls for the Accelus Servo Drives series. Designed to regulate current to brushless or brush servomotors, the unit accepts command signals from motion controllers and translates them into three-phase outputs that energize the motor windings. It supports industrial automation tasks such as controlling pick-and-place axes and executing electronic gearing operations.

The power stage operates from a bus ranging between 20 Vdc and 55 Vdc, allowing a single low-voltage supply to power multiple axes. Under continuous duty, it delivers 6 Adc, while its dual-mode control loop has a bandwidth of 3 kHz and an update rate of 20 kHz. These rates support tight torque regulation and rapid disturbance cancellation during dynamic motion. The ±10 V analog reference is buffered by a 66 kΩ input, so the drive electronics place minimal load on upstream digital-to-analog converters. A logic threshold of 2.5 Vdc sets the switching point for digital enables and limits, and the control inputs can tolerate up to 32 Vdc without damage. A minimum external capacitance of 330 µF must be connected across the DC bus to absorb regenerative energy and reduce supply ripple for the three-phase MOSFET inverter.

For short bursts, the amplifier can supply 18 Adc for up to one second, providing additional torque during acceleration or shock loads before returning to its continuous rating. Commanded step positions are accepted through differential inputs that handle pulse-and-direction streams up to 1 MHz, allowing high-resolution interpolation from high-speed motion controllers. The inverter uses a PWM carrier frequency of 40 kHz to minimize audible switching noise and current ripple. Internally, the reference path is digitized with 12-bit resolution, matching the precision of common industrial analog outputs and providing predictable scaling between the controller command and motor torque.