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Delta inverters use the standard naming convention:
VFD-[Power Code][Series Code][Voltage Code][Special Function Code].
Some new models (such as the MS300 series) adopt a more detailed extended naming format.
The following provides a comprehensive explanation from four aspects: general structure, meaning of each part, typical series examples, and special function codes.
- General Model Structure (Exemple: VFD007E23A)
| Position | Code | Signification | Example Description |
| 1–3 | VFD | Product Identifier | Variable Frequency Drive. All Delta inverters start with this. |
| 4–6 | 7 | Rated Power Code | Represents 0.75 kW (750 W). Different codes correspond to different power ratings. |
| 7 | E | Series Code | Indicates VFD‑E series (low‑power inverter with built‑in PLC). |
| 8–9 | 23 | Voltage & Phase Code | “2” = 200–240 V, “3” = 3‑phase input. |
| 10 | UN | Special Function Code | Standard version with built‑in EMI filter. |
- Detailed Breakdown of Each Part
2.1 Power Code vs. Rated Power (kW)
| Power Code | Rated Power | Power Code | Rated Power | Power Code | Rated Power |
| 2 | 0.2 | 15 | 1.5 | 75 | 7.5 |
| 4 | 0.4 | 22 | 2.2 | 110 | 11 |
| 7 | 0.75 | 37 | 3.7 | 150 | 15 |
| 10 | 1 | 55 | 5.5 | 220 | 22 |
Note: Some high‑power models use actual power directly, par ex., VFD110B43A = 110 kW.
2.2 Series Code & Caractéristiques
| Series Code | Series Name | Key Features | Applications typiques |
| M. | VFD‑M | Low noise, taille compacte | Small machinery, packaging, convoyeurs |
| E | VFD‑E | Built‑in PLC | Automated production lines |
| B | VFD‑B | Sensorless vector control, high torque | Ventilateurs, pompes, compresseurs, cranes |
| F | VFD‑F | For fans & pompes, built‑in PID | CVC, cooling towers, water supply |
| MS | MS300 | Compact high‑performance general‑purpose | Small automation, replaces VFD‑M |
| MH | MH300 | High‑performance vector, servo‑grade | Positioning, tension control, sync motors |
| CP2000 | VFD‑CP2000 | Sensorless vector, high overload | General industrial machinery |
| ED | VFD‑ED | Dedicated for elevators | Passenger & freight elevators, escalators |
2.3 Voltage & Phase Code
| Code | Input Power | Output | Application Region |
| 21 | 1‑phase 200–240 V | 3‑phase 0–240 V | Home/small equipment, Asia/NA |
| 23 | 3‑phase 200–240 V | 3‑phase 0–240 V | Industrial, Asia/NA |
| 43 | 3‑phase 380–460 V | 3‑phase 0–460 V | Industrial, global |
| 53 | 3‑phase 525–600 V | 3‑phase 0–600 V | High‑voltage industrial |
2.4 Special Function Suffix Codes
| Letter | Signification | Letter | Signification | Letter | Signification |
| UN | With EMI filter, standard | B | With braking unit | N | Without EMC filter |
| S | Built‑in STO | H | Enhanced heat dissipation | P. | Higher protection |
| ‑21 | Special version | ‑00 | Standard version | ‑EA | Energy‑saving for fans/pumps |
- New Extended Format (Exemple: VFD1A5MS43ANSHA, MS300)
| Position | Code | Signification | Description |
| 1–3 | VFD | Inverter identifier | Standard prefix |
| 4–6 | 1A5 | Rated output current | 1.5 UN (≈ 0.75 kW) |
| 7–8 | MS | Code de série | MS300 series |
| 9–10 | 43 | Voltage code | 460 V 3‑phase input |
| 11 | UN | IP rating | IP20 |
| 12 | N | EMC configuration | Without EMC filter |
| 13 | S | Safety function | Built‑in STO |
| 14 | S | Cooling | Standard cooling |
| 15–16 | AA | Special options | Standard configuration |
- Complete Model Examples
Exemple 1: VFD007E23A
VFD: Inverter
007: 0.75 kW
E: E series (built‑in PLC)
23: 3‑phase 200–240 V input
UN: Standard with EMI filter
Exemple 2: VFD110B43A
VFD: Inverter
110: 110 kW
B: B series (sensorless vector)
43: 3‑phase 380–460 V input
UN: Standard with EMI filter
Exemple 3: VFD1A5MS43ANSHA
VFD: Inverter
1A5: 1.5 A output (≈ 0.75 kW)
MS: MS300 series
43: 460 V 3‑phase input
UN: IP20
N: No EMC filter
S: STO
S: Standard cooling
AA: Standard version
- Sélection & Identification Tips
- Power matching: Select according to motor rated power; inverter ≥ 1.1× motor power recommended.
- Voltage compatibility: Confirm input phase and voltage (21/23/43, etc.).
- Series function: Choose by application (F for fans/pumps, E for PLC).
- Exigences particulières: Select protection, EMC, and safety functions as needed.
- Backward compatibility: New models (par ex., MS300) replace older ones.
- Quick Identification Mnemonic
Start with VFD,
Numbers show power,
Letters show series,
Two digits show voltage,
Suffix shows features.
With the above explanation, you can easily identify the power, série, tension, and functions of any Delta inverter model for accurate selection, purchasing, and maintenance.
