The Motorola APM-420A is an industrial servo amplifier that was designed for use in a variety of applications, including robotics, machine tools, and material handling. It is a high-performance amplifier that can provide up to 400 watts of continuous power and 800 watts of peak power. It also has a wide range of features, including:

• Support for a variety of servo motor types, including AC brushless, DC brush, and stepper motors
• Adjustable gain and offset
• Current and voltage limiters
• Fault protection
• Serial communication interface

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