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General Purpose AC Variable Frequency Drives (VFD)
General purpose variable frequency drives (VFD) enable speed control for AC motors such as those in conveyors, fans, pumps and material handling. Available in capacities up to 30hp, various models offer V/Hz, sensorless vector or field oriented vector control modes.
General purpose AC drives typically offer more features and a larger selection of horsepower and voltage
choices than a micro drive, and a lower cost than high performance drives. General purpose drives can be
used for any number of applications including conveyors, pumps, fan, HVAC systems, and elevators.
They provide the following benefits:
Variable speed - Trimming the motor speed lower or higher than base speed as well as ramp the accel and decel time when
changing speed or directions is their primary function.
Reducing start-up current - Controlling the inrush current at motor start-up allows the use of smaller fuses,
and reduces electrical peak load.
Many modern general purpose variable frequency AC drives (VFDs) offer features that are normally only found
on high performance drives, such as dynamic braking, sensorless vector control, advanced communication protocol
support, and an integrated PLC.
Integrated functionality - Most general purpose VFDs can vary motor speed and direction by operator input
(keypad buttons/speed control knob) or by digital and analog inputs (from pushbuttons/switches/pots or PLC outputs);
certain models support communication from a PLC or master controller, allowing networking with multiple drives for
ease of integration and control.
Cost - These drives are well worth their price for most applications. Unless you need a high-tech feature or have a
high horsepower requirement, a general purpose VFD will likely do the job and cost less than a high-performance model.
For part listings and specifications, go to Shop Now
WEG CFW300 variable frequency drives are ideal for applications on machines or equipment that require precise
variable-speed control with easy setup and operation.
The CFW300 series features a compact size and includes a built-in operator interface (HMI) and SoftPLC with free WPS
programming software. A variety of plug-in option modules for additional I/O and communications protocols can be added
to extend capabilities.
Ratings from 1/4hp to 5hp
Single-phase and three-phase power supply
DIN rail (35mm) or surface mounting with screws
Side-by-side mounting; no heat dissipation space required
1-phase models: 110-127 VAC & 200-240 VAC
3-phase models: 200-240 VAC
Control mode: scalar (V/Hz) or voltage vector (VVW)
Switching frequency: 2.5, 5, 10, or 15kHz
Output frequency range: 0-400 Hz; 0.1Hz resolution
150% overload for 60 seconds, 200% for 3 seconds every 10 minutes
Integrated brake chopper for frame size B (not available size A)
Local keypad built-in, remote keypad optional
DURApulse GS20 AC Drives
The DURApulse GS20 series high-performance vector control drives provide many common as well as advanced
functions, all in a very compact unit. Features include dynamic braking, PID, removable keypad, and RS-485 Modbus communications.
GS20 drives also offer single-phase input capability (all 230VAC drives can be supplied single-phase), a built-in PLC, and an
optional EtherNet/IP / ModbusTCP communication card.
DURApulse GS20 AC drives offer several speed control modes:
Standard V/Hz with pulse input feedback
In Sensorless vector control mode (SVC), the drive supports up to four (4) independent Induction Motor (IM)
parameter sets or supports control of a single AC Permanent Magnet (PM) motor
Ultra-precise Field Oriented Vector control (FOC) for maximum open loop speed regulation control
Expansive features include:
Ratings from 1/10hp to 30hp
Single-phase 120VAC up to 1hp
Single-phase/three-phase 230VAC up to 20hp
Three-phase 460VAC and 575VAC
Flexible carrier frequency to 15khz and output frequency to 600Hz
Speed control potentiometer built in
Built-in PLC to support up to 2K steps
Built-in USB port for fast, easy programming
Free downloadable software for drive configuration and PLC programming
Field-upgradable firmware (drive and communication option card)
Optional LCD keypad
Momentary power loss restarts
(7) digital inputs (including one pulse train input up to 33kHz), (2) digital outputs, (1) SPDT relay output, and (2) STO inputs
Analog I/O - configurable input type, (2) inputs and (1) output
(1) frequency output
Option slot supports backup control power option card, or EtherNet/IP / Modbus TCP communication option card
Multi-motor control (4 total)
Built-in dynamic braking (optional resistors)
PID controller, including sleep and wake functions
GS2 mode duplicates exact parameter configuration of GS2 series