Delta ASD-MS Series AC Servo Drives

Technical Dossier

Product Details And Specifications

Delta ASD-MS Series: Comprehensive Module Range and Technical Overview

The Delta ASD-MS Series is a compact, high-performance AC servo drive platform developed by Delta Electronics (Taiwan). It is deployed across global heavy industry sectors including petrochemical plants, nuclear facility auxiliary systems, oil refinery process lines, steel rolling mills, and precision CNC machining centers. The ASD-MS architecture is characterized by its integrated IGBT power stage, closed-loop encoder feedback compatibility, and RS-485/CANopen communication interface — making it a standard-specification servo amplifier for motion control retrofits and OEM machine builds operating in demanding 24/7 environments.

The series covers output ratings from 100W to 7.5kW (single-phase and three-phase variants), with input voltage compatibility across 100–240V AC and 200–230V AC ranges. Its compact DIN-rail and panel-mount form factor has made it a preferred choice for machine builders requiring high torque density in constrained cabinet spaces.

The Evolution of ASD-MS Architecture

Delta's servo drive product line evolved through several distinct generations. The early ASD-A Series (circa 2005–2010) established the foundational closed-loop servo control architecture with basic pulse/direction command input. The ASD-A2 Series introduced enhanced auto-tuning algorithms and full closed-loop vibration suppression, targeting higher-precision applications.

The ASD-MS Series represents a mid-range, cost-optimized branch of this lineage — retaining the proven ASDA control core while reducing feature overhead for applications that do not require advanced fieldbus (EtherCAT, PROFINET) integration. This makes ASD-MS units directly interchangeable with earlier ASD-A installations in many retrofit scenarios, provided encoder and motor wiring pinouts are verified against the specific revision datasheet.

As of 2024, the ASD-MS Series is in the mature/end-of-active-production phase for several sub-variants. Delta's current flagship servo platform is the ASD-B3 Series and ASDA-A3 Series, which offer IEC 61800-5-1 safety functions (STO, SS1) and EtherCAT native support. For installations where ASD-MS units remain in service, long-term maintenance sourcing is the primary procurement driver.

ASD-MS Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Delta ASD-MS Series. Units are classified by power rating and phase configuration:

Single-Phase 100–240V AC Input Models:

ASD-MS-0121-F: 100W single-phase servo amplifier, pulse/direction input, RS-485
ASD-MS-0221-F: 200W single-phase servo drive, incremental encoder feedback
ASD-MS-0321-F: 300W single-phase drive, compact panel-mount, analog ±10V input
ASD-MS-0421-F: 400W single-phase amplifier, auto-gain tuning, DIN-rail mount
ASD-MS-0721-F: 750W single-phase AC servo drive, IGBT output stage, RS-485/CANopen
ASD-MS-1021-F: 1kW single-phase servo amplifier, closed-loop torque/speed/position modes

Three-Phase 200–230V AC Input Models:

ASD-MS-0123-F: 100W three-phase servo drive, encoder Z-pulse index output
ASD-MS-0223-F: 200W three-phase amplifier, regenerative braking resistor terminal
ASD-MS-0323-F: 300W three-phase drive, 2500 PPR incremental encoder support
ASD-MS-0423-F: 400W three-phase servo amplifier, multi-mode command input
ASD-MS-0723-F: 750W three-phase AC servo drive, full closed-loop position control
ASD-MS-1023-F: 1kW three-phase amplifier, dynamic braking, panel-mount housing
ASD-MS-1523-F: 1.5kW three-phase servo drive, high-inertia load compensation
ASD-MS-2023-F: 2kW three-phase amplifier, extended I/O terminal block
ASD-MS-3023-F: 3kW three-phase servo drive, heavy-duty industrial cabinet installation
ASD-MS-4523-F: 4.5kW three-phase amplifier, high-torque spindle servo applications
ASD-MS-7523-F: 7.5kW three-phase servo drive, large-frame IGBT module, forced-air cooling

Sourcing Hard-to-Find & Obsolete ASD-MS Parts

DriveKNMS maintains a dedicated inventory program for Delta ASD-MS Series units that have transitioned out of Delta's active production schedule. For facilities operating legacy CNC lines, packaging machinery, or process automation equipment built around ASD-MS drives, unplanned downtime caused by unavailable spare drives represents a direct production loss.

DriveKNMS sources ASD-MS units through verified secondary market channels, factory-surplus stock, and decommissioned equipment recovery. All units are individually inspected prior to listing. For high-volume requirements (e.g., plant-wide servo drive standardization or multi-unit MRO contracts), volume pricing and reserved stock agreements are available upon request.

Quality Control for the ASD-MS Range

Each ASD-MS unit processed by DriveKNMS undergoes a structured inspection protocol designed for servo drive amplifiers with integrated power electronics and encoder interface circuits:

Visual & Mechanical Inspection: PCB surface examination for capacitor bulge, burn marks, corrosion on terminal blocks, and IGBT heatsink integrity. Connector and locking tab condition verified against OEM specification.

Power Stage Verification: DC bus capacitance measurement. IGBT gate drive signal integrity check. Inrush current limiter (NTC thermistor) continuity test.

Encoder Interface Test: Differential line receiver (RS-422) signal integrity verified using a reference encoder simulator at 2500 PPR. A/B/Z channel output confirmed at rated frequency.

Communication Port Test: RS-485 transceiver function verified. CANopen node address response confirmed where applicable.

No-Load Run Test: Unit powered at rated input voltage. All fault codes cleared. Speed command applied via analog input. Output current waveform symmetry verified on all three phases.

Units that do not pass all stages are quarantined and not listed for sale.