A Variable Frequency Drive (VFD) is a motor controller that varies the frequency and voltage of its power supply to drive an electric motor. It also manages the ramp-up and ramp-down of the motor during startup and shutdown. While the VFD controls the frequency and voltage of the power supplied to the motor, this process is often referred to as speed control, as it ultimately adjusts the motor speed.

Modern VFDs integrate networking and diagnostic capabilities to enhance performance and productivity. They offer energy savings, intelligent motor control, and reduced peak-current draw, making them an excellent choice for controlling motor-driven systems.

VFDs are commonly used to control fans, pumps, and compressors, which account for 75% of all drives in operation globally. Other motor controllers include soft starters and across-the-line contactors. A soft starter is a solid-state device that gently ramps up to full speed during motor startup. In contrast, an across-the-line contactor directly applies full line voltage to an electric motor.

Key Features of Delta VFD

DELTA VFD – VFD-E Series

Sensorless Vector AC Micro Drive. The VFD-E series represent Delta Electronics low horsepower, constant torque, IP20 rated Drive. Modular in design with flexible extension cards and a built-in PLC function, the E drive offers the ability to write and to execute simple Ladder Logic programs. This state-of-the-art series meets a full range of application requirements.

DELTA VFD – VFD-EL Series

The VFD-EL series is multiple function new generation micro type AC drive. It has built in EMI filter, RFI switch, easy DC bus sharing for side-by-side installation, high precision current detection, overload protection, and a built In keypad.

Application of DELTA VFD – VFD-EL Series

Specification

DELTA VFD – VFD-EL-W Series

Delta’s VFD-EL-W series is the new generation compact vector control drive. Simple, delicate and durable design inherits Delta’s superior drive technology.

 – Various essential functions are built-in as standard, including: Multi-step Operation; Torque Compensation; PID Control; Multi-Pump Control; Water Supply at Constant Pressure; Leakage Detection function and so on.

 – It also with complete built-in protection mechanism, such as: Over-current; Over-voltage; Low-voltage; Over-heat; Over-load; Over-torque; Phase Loss Protection and so on.

 VFD-EL-W not only saves the extra cost but also increase the market competitiveness with the best technics.

DELTA VFD – VFD-VE Series

This series adopts FOC (Field Oriented Control) which is a far more precise vector control algorithm. It can be used in both speed control and position control similar to a servo motor drive. The multi-function I/O terminal is expanded to meet users’ various application needs. In addition, it is supplied with a Windows based PC software program for managing parameters and dynamic monitoring. It provides an excellent solution for load regulation. It can output 150% of rated torque at zero speed, and it can have “point to point” and relative distance control functions for position control, making it the best choice for challenging industrial control applications.

Application of DELTA VFD – VFD-VE Series

Specification

DELTA VFD – VFD-B Series

The Delta VFD-B series are NEMA 1 rated, general purpose AC motor drives. The VFD-B family of drives are capable of sensorless open and closed loop vector control and provides constant torque output, for use in HVAC, woodcarving machine, punching machine, wastewater treatment systems, craned drive and swivel, washing machine, vertical stamping machines, compressor, elevator, escalator and many other applications.

The Delta VFD B is provided with a 16-bit microprocessor, embedded RS485 communication port supporting MODBUS communication protocol, PID feedback control, auto-tuning capability, and sleep revival function to name some of the Delta VFD-B’s major features.