Product Overview

The ASD-A2-0721-U (ASDA20721U) is a high-performance AC servo drive from Delta’s advanced ASDA-A2 series, specifically engineered to meet the demands of precision motion control and high-speed positioning. Delivering a rated output power of 750 W, this drive is a cornerstone for automation in electronics assembly, high-speed labeling, and precision CNC equipment. The ASDA-A2 series is distinguished by its 1 kHz bandwidth and built-in electronic cam (E-Cam) functions, which eliminate the need for complex external controllers in synchronized motion applications. By integrating the ASD-A2-0721-U into your control architecture, you ensure superior vibration suppression and high-resolution feedback, directly resulting in reduced machine settling times and maximized production efficiency.

Suffix Breakdown

The ASD-A2-0721-U nomenclature defines the hardware specifications as follows:

• ASD: AC Servo Drive (Product Category).

• A2: A2 Series (Advanced functional series with E-Cam and 20-bit encoder support).

• 07: 750 W Rated Output Power.

• 21: 220 V Input Voltage, 1-Phase / 3-Phase compatible.

• U: Model Type (Specific configuration for specialized communication or interface protocols).

Technical Specifications

Technical FAQs

Does the ASD-A2-0721-U support full-closed loop control?

Yes, the A2 series drives support full-closed loop control. By connecting an external linear scale or encoder to the CN5 interface, the drive can compensate for mechanical backlash and thermal expansion, ensuring that the final position of the load is accurate to the micron level.

Can this drive be used with a single-phase power supply?

The "21" designation indicates that the drive is compatible with 220 V single-phase power. While it can operate on 1-phase, using a 3-phase supply is recommended for high-load or high-inertia applications to improve power factor and reduce ripple current on the DC bus.

What are the primary benefits of the "U" type model?

The "U" type model is generally configured for specific interface capabilities or firmware sets within the ASDA-A2 range. It maintains the core high-speed processing and resonance suppression features while offering compatibility with specialized industrial communication protocols or CNC controller interfaces.

Engineering & Installation Guide

• Electromagnetic Compatibility (EMC): To prevent signal interference, always install an EMI filter on the input power line of the ASD-A2-0721-U. Ensure that the servo drive and the motor are grounded to a common point. The encoder cable must be routed separately from high-voltage power cables with a minimum clearance of 200 mm to avoid noise coupling.

• Heat Dissipation: Mount the drive vertically on a metallic backplane to facilitate heat transfer. Maintain at least 50 mm of clearance above and below the drive for airflow. If installing multiple drives in a single cabinet, ensure the internal cabinet temperature remains below 55 deg C to prevent thermal tripping.

• Braking Resistor Selection: For applications involving vertical loads or high-inertia rapid deceleration, the internal regenerative resistor may be insufficient. Calculate the regenerative energy and, if necessary, install an external braking resistor across the P and D terminals, ensuring the internal jumper is removed according to the manual.