Product Overview

The ASD-A2-0721-M (ASDA20721M) is a sophisticated 750 W AC Servo Drive from Delta’s premier ASDA-A2 series, engineered for applications that demand "High Precision" and total motion control. This drive is a staple in high-end automation, offering a high-speed frequency response of up to 1 kHz to ensure rapid and stable mechanical performance. The "M" type model is specifically distinguished by its integrated CANopen communication interface and advanced PR (Position Register) mode, which allows for internal path planning without the constant need for an external pulse generator. With its 20-bit feedback and full closed-loop capabilities, it is ideal for CNC tooling, high-speed labeling, and precision electronic assembly.

Technical Configuration

The ASD-A2-0721-M is built on a high-performance digital architecture designed for sub-micron accuracy. It supports a 20-bit resolution encoder (1,280,000 pulses per revolution), providing the resolution necessary for exceptionally smooth motion and high-speed positioning. The drive features an auxiliary encoder interface for Full Closed-Loop Control, allowing the system to read a second feedback signal (such as a linear scale) to compensate for mechanical backlash or thermal expansion in the transmission system. Additionally, its superlative vibration suppression algorithms—including automatic notch filters—effectively neutralize mechanical resonance, allowing for higher gain settings and faster settling times.

Technical Specifications

Technical FAQs

What is the specific utility of the PR (Position Register) Mode?

PR Mode allows the user to program up to 64 sets of position commands directly into the drive's internal memory. These can include point-to-point moves, homing routines, and speed changes. This is highly effective for reducing the load on the PLC, as the drive can execute complex motion sequences triggered by simple digital inputs rather than a constant high-speed pulse train.

How does "Real-time Capture and Compare" benefit high-speed lines?

The Capture function allows the drive to record the exact motor position (within 5 $\mu s$) the moment a digital input is triggered (e.g., by a registration sensor). The Compare function can then trigger a high-speed output at a specific target position. This is essential for precision labeling and high-speed cutting where mechanical latency must be minimized.

When should I implement Full Closed-Loop control?

Full Closed-Loop is recommended when there is a mechanical disconnect between the motor and the final load, such as a long lead screw or a belt-driven stage. By connecting a linear scale to the drive's CN6 port, the ASD-A2-0721-M can correct for any inaccuracies or "play" in the mechanics, ensuring the load reaches the exact target position regardless of belt stretch or gear wear.

Engineering & Installation Guide

• CANopen Network Setup: When using the ASD-A2-0721-M in a CANopen network, ensure that a 120 Ohm termination resistor is placed at the end of the trunk line. Use high-quality twisted-pair shielded cables (SF/UTP) to maintain signal integrity, especially when running alongside high-voltage motor cables.

• Vibration Suppression Tuning: Use the ASDA-Soft configuration software to perform an "Auto-Tuning" cycle. The drive will automatically detect the resonance frequency of your mechanical system and apply notch filters. For machines with low-frequency swaying, utilize the "Low-frequency vibration suppression" parameter to stabilize the load after rapid stops.

• Grounding and Noise: To prevent "Encoder Error" or "Communication Error" faults, ensure the drive is mounted to a grounded metal backplate. The motor power cable shield should be clamped 360° to the ground plate to suppress electromagnetic interference (EMI) generated by the high-frequency PWM switching of the drive.