AC servo drive
Delta Electronics ASDA-A3 AC servo drive
Delta's advanced AC servo drive series, 100 W to 3 kW on 200 V and 400 W to 7.5 kW on 400 V, paired with ECM-A3 motors that use 24-bit encoders; EtherCAT versions are used for high-speed multi-axis synchronisation.
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Power | 100–7,500 W |
|---|---|
| Supply | 200 V class and 400 V class |
| Fieldbus | EtherCAT (A3-E), other variants by model |
| Axes | 1 |
| Resolution (max) | 24 bit |
Summarised in our own words from Delta Electronics, Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2 · Source 3
Notes on this data
Product page content is dynamic; power ranges from Delta's CODESYS motion solution catalogue (2021); 24-bit encoder from the ECM-A3 data in the ASDA-B3 catalogue.
Specify Motion is not affiliated with Delta Electronics, Inc.. Delta Electronics and ASDA-A3 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Delta Electronics ASDA-A3 replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Delta Electronics part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
The second-generation Kinco JD drive, paired with SMK motors from 50 W to 7.5 kW. It accepts a very wide range of encoder protocols plus a second encoder, runs CANopen or EtherCAT, and has STO SIL3 / PL e on every model.
| Published maximum | ASDA-A3 | JD2 Series AC Servo Drives |
|---|---|---|
| Continuous current | — | 26 A |
| Peak current | — | 65 A |
| Power | 7,500 W | 7,500 W meets or exceeds |
| Axes | 1 | 1 meets or exceeds |
Leadshine's EL7 platform spans 220 VAC drives from 400 W to 2 kW, 400 VAC drives to 7.5 kW and an 11-22 kW high-power range, all with STO and EtherCAT, Modbus/pulse or PROFINET variants.
| Published maximum | ASDA-A3 | EL7S / EL7 Series AC Servo Drives |
|---|---|---|
| Continuous current | — | 44 A |
| Peak current | — | 88 A |
| Power | 7,500 W | 22,000 W meets or exceeds |
| Axes | 1 | 1 meets or exceeds |
Network-capable AMC digital drives spanning 10-747 VDC and 120-480 VAC, up to 150 A continuous and 250 A peak (27.4 kW peak power), in PCB, panel, machine and vehicle formats. They support almost any motor type and feedback, plus CANopen, EtherCAT, POWERLINK and Modbus.
| Published maximum | ASDA-A3 | DigiFlex Performance Servo Drives (DP,… |
|---|---|---|
| Continuous current | — | 150 A |
| Peak current | — | 250 A |
| Power | 7,500 W | 27,400 W meets or exceeds |
| Axes | 1 | — |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Typical applications
What an AC servo drive is
An AC servo drive, or servo amplifier, powers and controls a servo motor from mains supply. It rectifies the AC input to a DC bus, then uses an inverter of power transistors switched by PWM to produce controlled three-phase current in the motor. Nested current, velocity and position loops use encoder feedback to follow commands from pulse and direction, analogue or industrial Ethernet. Modern drives add auto-tuning, vibration suppression and safety functions such as safe torque off.
When engineers choose an AC servo drive
Choose an AC servo drive for mains-powered machines with servo axes from tens of watts to many kilowatts, such as packaging, machine tools and robotics. It gives precise, dynamic control with standard industrial interfaces. The trade-offs are cabinet space, wiring, EMC measures and the need to match motor and feedback. For low-voltage or mobile machines, a DC drive is more suitable; for many axes in one cabinet, a multi-axis drive may save space.
How to specify the Delta Electronics ASDA-A3
Send these with your enquiry and an engineer can confirm the right ASDA-A3 variant or an equivalent:
- Supply voltage and phases (V AC)
- Continuous and peak output current (A rms)
- Motor and feedback compatibility
- Command interface: pulse, analogue, EtherCAT, PROFINET and so on
- Safety functions, such as STO, and their rating (SIL, PL)
- Braking resistor and regenerative energy (W, J)
- Ambient temperature, mounting and cooling
Common mistakes to avoid
- Sizing on motor rated current without the drive's peak duration
- Ignoring regenerative energy on fast decelerations or vertical axes
- Leaving out EMC filtering and screened motor cables
- Mixing motor and encoder types the drive does not support
Delta Electronics ASDA-A3: frequently asked questions
Can you help replace Delta Electronics ASDA-A3 or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Delta Electronics ASDA-A3?
Delta's advanced AC servo drive series, 100 W to 3 kW on 200 V and 400 W to 7.5 kW on 400 V, paired with ECM-A3 motors that use 24-bit encoders; EtherCAT versions are used for high-speed multi-axis synchronisation. Published series figures include power 100 W, power 7,500 W, axes 1, resolution 24 bit. It is made by Delta Electronics, Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Delta Electronics ASDA-A3?
The Delta Electronics ASDA-A3 is made by Delta Electronics (Delta Electronics, Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Delta Electronics, Inc.; brand names are used only to identify the product.
What is the power of the Delta Electronics ASDA-A3?
The published series minimum power is 100 W. Individual models and sizes in the ASDA-A3 range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Delta Electronics ASDA-A3?
We can assess suitable replacement options. On published figures, Kinco JD2 Series AC Servo Drives and Leadshine EL7S / EL7 Series AC Servo Drives are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
Does a servo drive need a braking resistor?
When a servo motor decelerates, it acts as a generator and returns energy to the drive's DC bus. If the bus capacitors cannot absorb it, the voltage rises and the drive trips. A braking resistor dissipates the energy as heat. Fast decelerations, high inertia and vertical axes usually need one.
What is safe torque off on a servo drive?
Safe torque off, or STO, is a safety function that removes power that could produce torque at the motor, without disconnecting the drive supply. It is defined in IEC 61800-5-2 and used as part of a machine's safety system. Check the safety level achieved and wiring requirements.
Further reading: How to select a servo drive · How to select a servo motor · Servo drives
Other ac servo drive series
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