Device & Controls

Delta VFD‑VE / VFD‑V Series – compact vector drives with field‑oriented control (0–600 Hz), suitable for speed, torque, and position control; single‑ and three‑phase options from 1–50 HP (230 V) and 1–100 HP (460 V) 

Delta VFD‑B Series – general purpose sensorless/open‑loop vector drives, 0.1–400 Hz, built‑in PID and Modbus; compact frame (photo shows an 11 kW/24 A variant) .

Delta VFD‑E Series – micro-vector drives, 0.1–600 Hz, built‑in PLC functionality, EMI filter, and modular extensions 

Delta VFD‑S Series – budget-friendly micro drives, 1–400 Hz, with PID and Modbus communication

Delta Human-Machine Interface (HMI) – This is the most common meaning. Delta Electronics manufactures HMIs used in industrial automation for controlling and monitoring machinery.

Delta HMI software – Such as DOPSoft, which is used to design screens and logic for Delta HMI panels.

A specific model or issue – You might be asking about a specific Delta HMI model (like DOP-B, DOP-107BV, etc.) or a problem you're experiencing.