Delta ASD-A2-1521-L — 1.5kW AC Servo Drive, 220V, ASDA-A2 Series

Product Identification

Part Number: ASD-A2-1521-L

Also Searched As: ASDA-A2-1521-L, ASD A2 1521 L

Series: Delta ASDA-A2

Type: AC Servo Drive — 1.5kW, 220V Single/Three-Phase, Pulse/Direction Interface

Compatible Motors: ECMA Series (Delta)

Overview

The Delta ASD-A2-1521-L is a 1.5kW high-performance AC servo drive from the ASDA-A2 series, designed to meet the precision positioning demands of modern industrial automation. Running on 200–230V AC supply — single-phase or three-phase — and delivering 8.3 Arms of continuous output current, this drive sits in the practical centre of the ASDA-A2 220V range, capable enough for real machine tool and automation duty while staying within the electrical infrastructure of most industrial workshops.

The ASDA-A2 platform was developed by Delta Electronics to push motion control intelligence closer to the drive itself. Where earlier servo systems depended heavily on an external controller to manage position, speed, and cam profiles, the A2 series incorporates a built-in electronic cam function, 64-point internal position register (PR mode), vibration suppression filters, and full closed-loop capability — tools that allow many applications to run with minimal external controller involvement. The ASD-A2-1521-L brings all of that to the 1.5kW capacity point.

Paired with Delta's ECMA series servo motors carrying a 20-bit incremental encoder (1,280,000 pulses/revolution), this drive delivers the high-resolution feedback and tight velocity regulation that precision machining, packaging, and motion synchronisation applications require.

Technical Specifications

What 1.5kW Means in This Application Context

Servo drive sizing is about matching torque and speed to the duty cycle — not just picking the closest wattage figure. The 1.5kW rating places the ASD-A2-1521-L in the capacity bracket where it handles axes with real load: CNC table feeds on mid-format machining centres, indexing drives carrying moderate fixture and workpiece mass, packaging axes running at high cycle rates under product and conveyor load.

The maximum instantaneous output current of 24.9 Arms — three times the continuous rating — defines the acceleration authority the drive has during rapid traverse and deceleration transients. Getting a loaded axis from rest to operating speed quickly, without the motor lagging behind the position command, depends on this current headroom being available. The ASDA-A2 series uses it to achieve the sub-1ms settling time that makes short cycle-to-cycle positioning tight and consistent.

For 220V single-phase supply environments, the ASD-A2-1521-L accepts either wiring configuration. That flexibility matters in smaller facilities and retrofit projects where three-phase supply is not available at the machine location, or where only a single-phase 220V circuit has been run to the panel. The drive handles both — up to and including 1.5kW — without a separate hardware version.

Built-In Intelligence: E-CAM, PR Mode, and Vibration Control

Three features of the ASDA-A2 platform deserve attention because they affect how much external hardware a machine designer needs to include in the control system.

Electronic cam (E-CAM). The drive can store up to 720 E-CAM profile points and execute cam synchronisation internally. Flying shear, rotary cutoff, and registration mark following — applications that typically need a dedicated motion controller to manage the synchronisation relationship between a master encoder and a slave axis — can run on the drive's internal processor. The master encoder signal connects directly to the CN5 feedback input; the drive computes the commanded position continuously from the E-CAM table without requiring the PLC or CNC to calculate and transmit position commands for every cycle.

PR mode (internal position register). 64 independent position moves can be stored in the drive and triggered via digital I/O or RS-485 command. Each entry holds a destination position, speed, acceleration time, and deceleration time. Executing a sequence of positions does not require the controller to issue individual move commands — the drive sequences through the stored positions on DI triggers, with optional jump conditions and homing routines. For simple indexed positioning systems, this eliminates the motion controller entirely.

Vibration suppression. Two independent low-frequency vibration suppression filters run automatically to damp end-of-arm or machine-edge oscillation without operator tuning. Two auto notch filters handle high-frequency mechanical resonance. The filters update in real time based on operating conditions. On machines with light structures, long moment arms, or compliant belt drives — where traditional servo tuning would require detuning the gains to avoid exciting resonances — the A2's auto suppression often allows higher gain settings and shorter settling times without instability.

Full Closed-Loop Capability

The CN5 connector on the ASD-A2-1521-L accepts a second encoder input from a linear scale or external rotary encoder mounted on the load side of the mechanical drive train. With this signal active, the drive's position loop closes around the load-side position rather than the motor-side encoder. Mechanical imperfections — ballscrew pitch error, gearbox backlash, belt compliance — that would cause position error in a semi-closed loop are corrected because the control loop sees actual load position directly.

For applications where positioning accuracy must be guaranteed at the tool or workpiece rather than at the motor shaft, full closed-loop control is the correct architecture. The ASD-A2-1521-L supports it natively, without any additional hardware beyond the CN5 cable and the scale.

Compatible Delta ECMA Motors at 1.5kW

All ECMA motors at 1.5kW carry the 20-bit incremental encoder standard, providing 1,280,000 pulses/revolution of feedback to the drive. The motor selection between the 2,000 rpm and 3,000 rpm variants follows the same logic as any servo system sizing decision: higher speed with lower continuous torque for fast-cycling axes, lower speed with higher continuous torque for sustained-load drives.

Typical Applications

CNC milling and machining centres. X, Y, and Z table feed axes on mid-format vertical machining centres run at sustained cutting feedrates under cutting force loads. The 1.5kW capacity covers the axis torque demands at typical feeds and speeds, while the A2's full closed-loop capability and 1kHz bandwidth support the tight following error tolerances that machined surface quality requires.

Printing and label processing machines. Registration control axes on web-fed printing machines and label applicators use servo drives in speed and position modes with high-speed capture and compare functions. The ASDA-A2's built-in capture function — which records the encoder count at the moment a digital input triggers, without latency — enables precise mark detection and position correction at high web speeds.

Packaging and filling line servo axes. Infeed, reject, and dosing servo axes on packaging lines run at high cycle rates, often changing target position and speed between strokes during the working cycle. PR mode covers this duty — the target position and speed for the next stroke can be updated via RS-485 while the current stroke is executing, enabling seamless profile switching without the PLC managing each position command individually.

Injection moulding auxiliary drives. Core pull, ejector, and material feed axes on injection moulding machines use servo drives in torque and position modes. The A2's torque control mode accepts a 0–±10V analogue command, suited to hydraulic-replacement servo architectures where the controller outputs an analogue torque reference.

Semiconductor and electronics assembly. Pick-and-place, die bonding, and dispensing axes in electronics manufacturing need fast response, short settling time, and smooth low-speed operation. The A2's 20-bit encoder feedback and sub-1ms settling time provide the dynamic performance these precision assembly applications demand.

Robot arm joint drives. Articulated robot primary joint axes in the 1.5kW range use servo drives with E-CAM capability for synchronised multi-axis motion. The built-in cam function and CANopen (available on the -M suffix variant) support the coordination requirements of robot motion without a high-overhead external trajectory computer on every axis.

Frequently Asked Questions

Q1: What is the difference between the ASD-A2-1521-L and the ASD-A2-1521-M?

Both drives are 1.5kW, 220V ASDA-A2 series drives with identical power ratings and core performance. The difference is the communication interface and optional functions. The ASD-A2-1521-L is the standard pulse/direction interface version with RS-232/RS-485 (Modbus) communication — the straightforward choice for CNC and PLC systems using step/direction or analogue command signals. The ASD-A2-1521-M adds a CANopen (RJ45) interface and additional digital input expansion capability, making it the correct selection for multi-axis systems coordinated through a CANopen master controller or Delta's motion control networks.

Q2: Can the ASD-A2-1521-L run on single-phase 220V power?

Yes. For 220V models from 100W through 1.5kW, the ASDA-A2 series accepts both single-phase and three-phase 200–230V input. The ASD-A2-1521-L is specifically within this range. Connect single-phase to the L1 and L3 input terminals per the wiring diagram in the user manual. When running on single-phase, be aware that the input current draw is approximately double the three-phase figure, so supply circuit sizing and fusing must account for the higher single-phase input current.

Q3: What encoder resolution does the ASD-A2-1521-L support, and does it require a specific motor?

The drive is designed for use with Delta's ECMA series servo motors, which carry a 20-bit incremental encoder at 1,280,000 pulses/revolution. This resolution is the basis of the drive's precision positioning capability and smooth low-speed performance. While the drive can accept other encoder signals in some configurations, the full specification and factory-validated performance — including the E-CAM and PR mode functions — are calibrated to the ECMA motor and encoder combination. Using non-Delta motors requires confirming encoder compatibility and careful parameter configuration.

Q4: What is PR mode and when should it be used instead of pulse/direction control?

PR mode (Position Register mode) stores up to 64 independent position moves inside the drive. Each entry contains a destination position, speed, and acceleration/deceleration time. Moves are triggered by digital input signals rather than pulse trains from an external controller. PR mode is the right architecture when the machine's PLC or controller cannot generate high-frequency pulse trains reliably, when the motion profile needs to change based on process conditions without reconfiguring the controller, or when a dedicated motion controller is not justified for a simple indexed positioning application. For complex coordinated multi-axis motion, pulse/direction from a motion controller remains the standard approach.

Q5: Does the ASD-A2-1521-L have a built-in regenerative resistor, and when is an external resistor needed?

Yes, the ASD-A2-1521-L includes a built-in regenerative resistor. For the majority of standard applications — horizontal axes, moderate inertia loads, normal cycle rates — the built-in resistor handles regenerative energy without additional hardware. An external regenerative resistor becomes necessary when the duty cycle involves frequent, high-energy deceleration events: heavy vertical axes stopping from high speed repeatedly, large-inertia loads cycling at high frequency, or any application where the regenerative energy per cycle exceeds the built-in resistor's dissipation capacity. Delta provides capacity selection guidance in the ASDA-A2 user manual to determine whether the built-in resistor is sufficient or an external unit (such as the BR1K0W020) is required.