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Delta Electronics: the value-tier ecosystem play
Engineer's Field Guide · Delta Electronic Group
The Delta Electronics Playbook:
VFDs, PLCs & Servo Drives Explained
Delta's catalog has moved through several naming generations — legacy letter-series drives, current MS/MH/C2000 VFDs, DVP and AS series PLCs, and the ASDA-A/B servo lines. Here's how it all maps together, and how to source the right replacement without guessing.
01 / Overview Why Delta
Delta Electronics: the value-tier ecosystem play
Delta Electronics is a Taiwan-based manufacturer of industrial automation hardware — VFDs, PLCs, servo drives, HMIs, and temperature controllers — designed to integrate natively with each other while still supporting open protocols like Modbus, CANopen, and EtherCAT for cross-brand use.
That ecosystem approach is why a Delta Electronics VFD drive, a Delta PLC, and a Delta servo drive show up together on the same machine so often. OEMs could spec an entire control system from one vendor — at a price point that undercuts the established European and Japanese brands — without locking customers into a single-brand architecture.
Quick answer: legacy Delta hardware, current equivalent
- VFD-B / VFD-S / VFD-M / VFD-L (discontinued VFDs) → MS300 series
- VFD-VE (discontinued VFD) → C2000, or MH300 for wind/unwind duty
- DVP series (legacy PLC) → still active in the field; AS series is the current platform for new builds
- ASDA-A2 / ASDA-B2 (previous-gen servo drives) → ASDA-A3 / ASDA-B3 current generation
The tradeoff with any fast-moving, value-positioned automation brand is the same: the lineup evolves quickly, older series get end-of-life'd in favor of newer ones, and the model numbering isn't always intuitive if you're coming from a Siemens or Allen Bradley background. A facility might be running a decade-old VFD-B drive next to a current-generation C2000, with nothing on Delta's own site connecting the two.
This guide maps Delta's VFD, PLC, and servo drive lineups end to end — legacy series to current replacement, what each tier is actually built for, and where Delta fits relative to better-known brands when a customer is comparing options.
02 / Drives Delta VFD Lineup
Delta VFDs: from legacy letter series to MS300, MH300 & C2000
If you've pulled a drive off a machine and it's labeled VFD-B, VFD-S, VFD-M, VFD-L, or VFD-VE, you're looking at a discontinued series. Here's how legacy hardware maps to what Delta currently sells:
| Legacy Series | Status | Current Replacement | Notes |
|---|---|---|---|
| VFD-B | Discontinued | MS300 (smaller frames) or C2000 (larger frames) | NEMA1 general-purpose drive; split replacement path by power range |
| VFD-S | Discontinued | MS300 | Cost-effective general-purpose micro drive |
| VFD-M | Discontinued | MS300 | Compact medium-power drive, sensorless vector control |
| VFD-L | Discontinued | MS300 | Entry-level general-purpose series |
| VFD-VE | Discontinued | C2000 (or MH300 for wind/unwind) | Flux vector/torque control; MH300 specifically for high-speed wind/unwind duty |
| VFD-EL | Legacy, still seen | MS300 (compact tier) | Ultra-compact micro drive, sub-4kW; EL-W variant adds vector control |
Keep in mind the physical footprint, wiring layout, and parameter structure all change between generations — a same-tier swap on paper is still not a true drop-in. Always re-verify dimensions and parameter mapping before committing to a replacement.
Current series, by where they fit
The MS300 is Delta's compact, general-purpose workhorse and the default replacement target for most discontinued letter-series drives above. It's built for space-constrained panels and covers a broad power range with single- and three-phase input options — the right call when a customer describes "a small drive on a conveyor or fan."
The MH300 is positioned for higher-speed, more demanding general-purpose work. Delta's own replacement guidance calls it out specifically for wind/unwind applications, which signals tighter speed regulation and torque control than the MS300 offers.
The C2000 is the high-performance end of the standard lineup — built-in PLC functionality, dual CPU architecture, and support for Modbus, CANopen, and optional Profibus. This is the drive for vector control precision, drive-level programmable logic, or replacing a VFD-VE in most non-wind/unwind duty.
The CP2000 is a variant tuned specifically for pumps, fans, and HVAC — same sensorless vector control foundation as the C2000, with intelligent PID control built in for pressure and flow regulation. Worth knowing when the application is process-pump or HVAC related rather than general motion.
Delta MS300 · MH300 · C2000 · CP2000 · VFD-EL — certified replacements in stock, 2-year warranty
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03 / Controllers Delta PLC Platforms
Delta PLC platforms: DVP, AH500 & AS series explained
A Delta PLC is a programmable logic controller built by Delta Electronics for industrial automation, sold across three platform tiers: the compact DVP series, the modular AH500 series, and the current-generation AS series.
Delta's PLC platform splits cleanly into two generations you'll encounter in the field, plus a modular step-up tier for larger systems.
DVP Series
Compact (Legacy, Still Active)
The long-running compact PLC family — ES2/ES3, EH3, SS2, SV2, SX2 sub-series and more, differentiated mainly by I/O count and program capacity. Most older Delta-controlled machines run on DVP.
AH500
Modular Mid-to-Large
Modular step up from DVP for medium-to-large applications needing distributed I/O and broader fieldbus support.
AS Series
Current Mid-Range
Delta's current platform. Self-developed 32-bit SoC CPU, up to 1,024 I/O across 32 extension modules, native motion control up to 8 axes CANopen or 6 axes pulse.
AS Motion CPU
EtherCAT Motion (Current)
AS series variant with EtherCAT/CANopen motion interface for higher-axis-count synchronized motion — packaging, labeling, printing, textile lines.
If you're troubleshooting an older Delta-controlled machine, DVP is the most likely platform you're looking at. The AS series is the one most likely to show up in newer installs — when a customer is asking about packaging, labeling, printing, or textile machinery with real motion control demands, AS series is generally the answer, where DVP was built more for straightforward sequential logic.
Programming environment: ISPSoft vs. DIADesigner
Delta uses two main software environments. ISPSoft handles traditional ladder-logic-style programming across the DVP and AS families. DIADesigner supports AS series plus the newer DVP-ES3/EX3/SV3/SX3 models, combining hardware, network, and motion configuration in one interface. Both follow the IEC 61131-3 standard, so programming concepts transfer reasonably well from other brands even though the software itself is Delta-specific.
Delta DVP, AH500 & AS series PLCs and I/O modules — in stock, 2-year warranty
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04 / Motion Delta Servo Drive Lineup
Delta servo drive guide: ASDA-A vs. ASDA-B
A Delta servo drive controls position, speed, and torque for a servo motor using closed-loop feedback. Delta sells two ASDA families — the high-performance A-series and the general-purpose B-series — each now in its third generation.
Delta's ASDA servo line splits into two families that are easy to confuse if you're not familiar with the naming convention: A and B.
| Series | Tier | Current Generation | Best For |
|---|---|---|---|
| ASDA-A2 / A2-E | High-Performance | Superseded by A3 | Precision positioning; CANopen on -M/-E variants; still common on un-upgraded equipment |
| ASDA-A3 / A3-E | High-Performance | Current | CNC, robotic arms, high-speed packaging — ~3.1kHz bandwidth, 24-bit absolute encoder, auto-tuning |
| ASDA-B2 | Standard / General Purpose | Superseded by B3 | Cost-sensitive applications not needing A-series bandwidth headroom |
| ASDA-B3 / B3-E / B3A | Standard / General Purpose | Current | Smaller footprint than B2 (up to 20% drive, 31% motor), shared DC bus, CANopen/EtherCAT on select variants |
The A-series is aimed at applications where bandwidth and encoder resolution actually matter to the outcome — CNC equipment, robotic arms, high-speed packaging. ASDA-A3 is the current generation, with auto-tuning and a system analysis interface that shortens commissioning time. The A2 generation supports CANopen on its -M variants and remains common on equipment that hasn't been upgraded.
The B-series is the value-tier servo platform — still precise, but positioned for cost-sensitive work. ASDA-B3 is current here, with a notably smaller footprint than B2 and shared DC bus support to reuse regenerative energy across multiple drives. Several B3 variants support CANopen and EtherCAT depending on configuration, so it's more accurate to think of B-series as a value-tier platform with real network flexibility, not strictly a "basic" line.
For motion network integration specifically: ASDA-A2-E, A3-E, and B3-E variants are what's needed if the servo has to talk CANopen to a DVP15MC or DVP10MC motion controller — a fairly specific compatibility requirement worth confirming before ordering a replacement drive.
Delta ASDA-A2 · A3 · B2 · B3 servo drives and ECMA servo motors — in stock, 2-year warranty
Shop ASDA Servo Drives →
05 / Positioning Where Delta Fits
Delta vs. the established brands — where it actually competes
Delta won't out-spec the top end of Siemens, Mitsubishi, or Yaskawa, and it isn't trying to. The combination of price and native integration across Delta's own PLC, VFD, servo, and HMI ecosystem is the actual selling point — OEMs who standardize on Delta across an entire machine get a control system that was designed to work together out of the box, at a lower total cost than mixing premium brands.
On the servo side specifically, ASDA sits in a similar performance tier to Yaskawa's Sigma series or Mitsubishi's MR-J line for bandwidth and positioning accuracy. On the PLC side, the AS series competes more directly with compact-to-mid-range platforms like Siemens S7-1200 or Mitsubishi's FX series than with high-end process controllers. And on drives, the C2000's built-in PLC functionality is a genuine differentiator — fewer customers need a separate compact PLC just to handle drive-level logic.
For maintenance teams inheriting Delta-equipped equipment from an OEM, the practical upshot is this: don't assume Delta parts are interchangeable with whatever else is in the panel just because the brand is less familiar. Verify voltage class, control mode, and communication protocol the same way you would for any cross-brand sourcing decision.
06 / Compatibility Replacing Delta Parts
Replacement paths — the questions engineers ask under pressure
VFD, PLC, and servo failures happen at the worst possible times. Here's a direct answer to the most common replacement and compatibility questions IAC engineers receive for Delta Electronic Group systems.
| Scenario | Feasible? | What to Check First |
|---|---|---|
| Replace a discontinued VFD-B/S/M/L with current MS300 | Yes — with reconfiguration | Footprint and wiring layout change between generations; parameters must be re-entered, not copied; verify voltage class and power rating match |
| Replace VFD-VE with C2000 or MH300 | Yes — application-dependent | Use MH300 specifically for wind/unwind duty; C2000 for general vector-control replacement; confirm control mode (V/F vs. vector) before ordering |
| Swap one Delta VFD for an identical model | Yes — direct | Confirm full part number and frame size; transfer or re-enter parameter set; verify firmware version if drive supports field updates |
| Replace DVP PLC sub-series CPU (e.g., ES2 for ES2) | Yes — direct | Match I/O point count and program capacity exactly; transfer program via SD/memory card or USB; verify COM port configuration |
| Migrate a DVP system to AS series | Yes — migration project | Program logic must be ported, not copied directly; I/O modules are not cross-compatible between DVP and AS; plan for re-commissioning and re-testing motion functions |
| Replace ASDA-A2 servo drive with ASDA-A3 | Yes — with re-tuning | Encoder resolution differs (A3 uses 24-bit absolute); auto-tuning parameters must be re-run; confirm CANopen variant (-E/-M) if used in a motion network |
| Replace ASDA-B2 with ASDA-B3 | Yes — with re-tuning | B3 has a smaller physical footprint; verify panel space and mounting; shared DC bus wiring differs if multiple drives are linked |
| Run a Delta servo with a non-Delta motor, or vice versa | Possible — verify first | Encoder protocol, feedback resolution, and motor constants must match; confirm nameplate specs and encoder type before assuming plug-and-run operation |
The most important rule across Delta replacements: match voltage class, control mode, and frame size before assuming a same-tier swap is a drop-in. Delta's rapid generational turnover means parameter structures, wiring terminals, and physical dimensions often change even when the replacement is functionally equivalent. IAC verifies compatibility before recommending any replacement.
Need a Delta VFD, PLC, or servo match? Submit your part number — IAC verifies compatibility before shipping
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07 / FAQ Common Delta Questions
Delta Electronics VFD, PLC & servo drive — frequently asked questions
Straight answers to the questions IAC's engineers hear most often when a customer is sourcing Delta replacement parts.
Q1 What is a Delta Electronics VFD used for?
A Delta Electronics VFD (variable frequency drive) controls the speed and torque of an AC motor by varying the frequency and voltage supplied to it. Common applications include conveyors, pumps, fans, compressors, and HVAC systems where adjustable motor speed improves efficiency and reduces mechanical stress.
Q2 What replaces a discontinued Delta VFD-B or VFD-S drive?
The MS300 series replaces VFD-S, VFD-M, and VFD-L directly, and replaces VFD-B for smaller frame sizes. Larger VFD-B units step up to the C2000. Physical footprint and parameter structure change between generations, so treat it as a reconfiguration, not a drop-in swap.
Q3 What is the difference between Delta DVP and AS series PLCs?
The DVP series is Delta's long-running compact PLC platform, common on existing equipment and built mainly for sequential logic. The AS series is the current mid-range platform, built around Delta's 32-bit SoC CPU with native multi-axis motion control — the better fit for packaging, labeling, and printing machinery with real motion demands.
Q4 Can a Delta servo drive run a motor from another brand?
Possibly — encoder protocol, feedback resolution, and motor constants must match between the Delta servo drive and the motor. IAC verifies nameplate specs and encoder type before confirming plug-and-run compatibility on any cross-brand pairing.
Q5 What is the difference between ASDA-A3 and ASDA-B3?
ASDA-A3 is Delta's high-performance servo drive, built for precision positioning in CNC and robotics applications with roughly 3.1kHz of bandwidth and a 24-bit absolute encoder. ASDA-B3 is the general-purpose tier — smaller footprint, lower cost, and sufficient precision for applications that don't need A-series bandwidth headroom.
Q6 Does IAC stock Delta Electronics parts?
Yes. IAC stocks Delta VFDs (EL, MS, MH, C2000 series), DVP and AS series PLCs, ECMA servo motors, and ASDA servo drives, each backed by a 2-year warranty with same-day shipping on in-stock units.
08 / Sourcing Getting Delta Parts Fast
Your line can't wait. Neither can we.
IAC stocks Delta Electronic Group components across VFDs (EL, MS, MH series), DVP PLCs, ECMA servo motors, and ASDA servo drives — sourced, tested, and ready whether you're matching legacy hardware that's left standard distribution channels or sourcing for a new build. Delta's fast product turnover means a meaningful share of in-service equipment is running discontinued series; IAC's certified inventory is built for exactly that gap.
Warranty and verification
Every Delta unit IAC ships carries a 2-year in-service warranty. VFDs and servo drives are tested under load; PLCs are verified for I/O functionality and communication port operation before they leave the warehouse. We confirm voltage, control mode, and protocol support against your existing system before any replacement ships.
Same-day shipping
In-stock Delta parts ordered before 4:00 PM Eastern ship same day. For urgent needs, call (877) 727-8757 during business hours — quote turnaround is typically under five minutes. You can also submit a part number via the quote form ↗ or email sales@iac.us.com.
Delta Electronic Group · VFDs · DVP/AS PLCs · ASDA Servo Drives — all in stock, 2-year warranty
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