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Variable frequency drives (VFD) enable speed control for 3-phase AC motors such as those in conveyors, fans, pumps and shop tools. In ratings up to 300hp, the diverse lineup includes DURApulse GS series, Ironhorse, Toshiba, and WEG brands, with various environmental ratings and control modes.
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AC Variable Frequency Drives (VFD)
Category Selection
Variable frequency drives control the speed of alternating-current (AC) induction motors. In addition to saving energy, VFDs also reduce inrush current when starting a motor and provide controlled acceleration/deceleration to help prolong AC motor life.
- Micro drives enable speed control for AC motors at an affordable price and in a compact footprint
- General purpose drives provide speed control for AC motors in a variety of applications including conveyors, fans, and pumps
- High-performance AC drives offer advanced features such as STO, closed-loop vector control and a built-in logic controller
- VFDs suitable for washdown-duty applications are housed in a NEMA 4X (IP66) enclosure
- A wide variety of accessories includes line reactors, braking units, I/O modules, fans, and keypads
For part listings and specifications, go to Shop Now
AC Drives Overview and Selection Guide
Micro VFDs
WEG CFW100 Drives
WEG CFW100 drives offer high performance and compact size, with a built-in HMI and PLC. These micro drives offer sensorless vector (SVC), scalar (V/F) or voltage vector (VVW) control
- 115 VAC single-phase input / 230 VAC three-phase output, up to 1/2hp
- 230 VAC single-phase input / 230 VAC three-phase output, up to 1hp
DURApulse GS10 Drives
The DURApulse GS10 series offers high quality and abundant features at our lowest price point. These drives support sensorless vector (SVC) or scalar (V/F) drive modes.
- 120 VAC single-phase 1/4 to 1hp
- 230 VAC single-phase 1/4 to 3hp
- 230 VAC three-phase 1/4 to 7.5hp
- 460 VAC three-phase 1/2 to 10hp
General Purpose VFDs
Newest Additions!
- WEG CFW320 series AC drives
DURApulse GS20 AC Drives
DURApulse GS20 general purpose vector control drives provide many standard and advanced functions, all in a compact unit. Speed control modes available include standard V/Hz with pulse input feedback, sensorless vector control (SVC), and ultra precise field oriented vector control (FOC).
- Single-phase 120 VAC up to 1hp
- Single-phase/3-phase 230 VAC up to 20hp
- Three-phase 460 VAC up to 30hp
- Three-phase 575 VAC up to 10hp
IronHorse ACG Drives
The IronHorse ACG series of sensorless vector AC drives bridges the gap between a micro drive and high-performance VFD. These drives provide a variety of great features including dynamic braking, PID functionality, and RS-485 Modbus communication. All of the 230VAC and 460VAC models are fully capable of single-phase input capability (with derating), they offer several embedded analog and discrete I/O points, and can support up to two (2) independent IM motor parameter sets.
- Single-phase 230 VAC up to 10hp
- Three-phase 230 VAC up to 20hp
- Single-phase 460 VAC up to 15hp
- Three-phase 460 VAC up to 30hp
WEG CFW320 Drives
WEG CFW320 AC series drives are feature rich general purpose drives which include a built-in operator interface and SoftPLC. They also support scalar (V/Hz) or voltage vector (VVW) control. These drives include all the features of the CFW300 and add support for 460 VAC and optional Ethernet communications.
- 115 VAC single-phase input / 230 VAC three-phase output, up to 1.5hp
- 230 VAC single-phase input / 230 VAC three-phase output, up to 3hp
- 230 VAC three-phase input I 230 VAC three-phase output, up to 5hp
- 460 VAC three-phase input I 460 VAC three-phase output, up to 10hp
WEG CFW300 Drives
WEG CFW300 AC drives offer general purpose and ease-of-use with built-in HMI operator interface and SoftPLC, and support scalar (V/Hz) or voltage vector (VVW) control.
- 120 VAC single-phase input / 230 VAC three-phase output, up to 1.5hp
- 230 VAC single-phase input / 230 VAC three-phase output, up to 3hp
- 230 VAC three-phase input / 230 VAC three-phase output, up to 5hp
High-Performance VFDs
DURApulse GS30 AC Drives
DURApulse GS30 drives provide expanded parameter sets for greater versatility, several Ethernet communication options (including EtherCAT®), and advanced control modes including full closed loop for induction or permanent magnet AC motors.
- 230 VAC single-phase 1/2 to 3hp
- 230 VAC three-phase 1/2 to 50hp
- 460 VAC three-phase 1/2 to 100hp
Toshiba AS3 AC Drives
Toshiba is a brand known for ruggedness and durability. The AS3 drives include many great features built in, such as Ethernet communication, that are an added cost with other drives. On top of the many embedded features, optional features include EtherCAT communications, closed-loop vector control, and optional 120 vac IO card.
- 460 VAC three-phase 1/2 to 300hp
WEG CFW500 AC Drives
WEG CFW500 high-performance drives support closed-loop flux vector and torque control modes, available in sizes up to 150hp.
- 230 VAC single-phase 1/4 to 3hp
- 230 VAC three-phase 1/4 to 40hp
- 460 VAC three-phase 1/3 to 150hp
DURApulse GS4 AC Drives
DURApulse GS4 series AC drives handle applications up to 300hp, and support sensorless vector technology.
- 230 VAC single-phase 1 to 25hp
- 230 VAC three-phase 1 to 100hp
- 460 VAC three-phase 1 to 300hp
Washdown (NEMA 4X) VFDs
WEG CFW500 IP66 AC Drives
Same closed-loop flux vector technology as the CFW500 IP20 in a NEMA 4X rated enclosure, in sizes up to 20hp.
- 230 VAC single-phase 1/4 to 3hp
- 230 VAC three-phase 1/4 to 10hp
- 460 VAC three-phase 1/3 to 20hp
IronHorse ACN/ACNND Series AC Drives
ACN series NEMA 4X drives offer standard V/Hz, slip compensation, sensorless vector control (SVC), and torque control. Configure these drives with the free, user-friendly VFD Suite configuration software.
- IP66 / NEMA 4X rating
- Three-phase 200-240 VAC, 50/60 Hz, up to 20hp
- Three-phase 380-480 VAC, 50/60 Hz, up to 30hp
DURApulse GS20X NEMA 4X AC Drives
GS20X series NEMA 4X drives offer standard V/Hz with pulse input feedback, sensorless vector control (SVC), and Field Oriented Vector control.
- IP66 / NEMA 4X rating
- Three-phase 200-240 VAC, 50/60 Hz, up to 7.5hp
- Three-phase 380-480 VAC, 50/60 Hz, up to 10hp
AC Line Reactors
Input line reactors protect the AC drive from transient overvoltage conditions typically caused by utility capacitor switching. Input line reactors also reduce the harmonics associated with AC drives and are recommended for all installations.
These components are compatible with various DURApulse, Toshiba GS series, and WEG drives (check specifications for selection).
Output Filters
Output line (load) reactors protect the motor insulation against AC drive short circuits and IGBT reflective wave damage, and also allow the motor to run cooler by "smoothing" the motor current waveform. They are recommended for operating "non-inverter-duty" motors, and for any motors where the length of wiring between the AC drive and motor is less than 100 feet.
For AC Drive-to-Motor wiring distances over 100 feet, use of the VTF series output filter is recommended.
Braking Units and Resistors
Braking resistors are used to increase the braking torque of the AC drive, for frequently repeated ON-OFF cycles of the AC drive, or for decelerating a load with large inertia. Braking resistors are compatible with various AC drives (check specifications for selection).
Larger AC drives also require that dynamic braking units be used in conjunction with the appropriate braking resistors. Braking units are available for certain DURApulse drives.
EMI Filters
Newest Additions!
- EMI filters for WEG CFW320 series AC drives
Filters reduce electromagnetic interference and offer high performance for use in a variety of drive applications where long motor supply cable runs are necessary and where compliance with industrial noise limits is required.
Zero phase reactors, (aka RF noise filters) help reduce radiated noise from the inverter wiring and are effective for noise reduction on both the input and output sides of the inverter.
Components are compatible with various GS series, WEG, or other brands of drives (check specifications for selection).
VFD Communications & I/O Modules
Newest Additions!
- Ethernet, serial, and various I/O modules for WEG CFW320 series AC drives
Option cards are available to increase the I/O or add communications capabilities. Modules are available for various DURApulse, Toshiba, IronHorse, and WEG drives.
Options include (check for compatibility with specific drives):
- Ethernet, EtherNet/IP, Modbus TCP, Modbus RTU, BACnet, and EtherCAT communications options
- Discrete input, discrete output, relay output, and discrete I/O combo modules
- Analog, relay/analog, encoder/analog, and temperature/relay combo modules
- STO module
- Encoder modules, line driver and open collector
- Multi-port Ethernet cards for select DURApulse and IronHorse drives
VFD Software & Accessories
Newest Additions!
- Accessories for WEG CFW320 drives including replacement fans and remote keypads
Drive configuration and programming software (available as a free download or on USB) allows the user to connect to a VFD from a PC for fast, convenient setup and/or programming of a built-in PLC, and offline storage of (multiple) configuration parameters.
An assortment of accessories to complete your VFD installation includes:
- Conduit box kits that bolt to the bottom of a VFD to provide conduit entry and a/ NEMA 1 rating without the need to install in a separate enclosure
- Flange mounting kits to extend the heat sinks on the back of the drive through the rear of the enclosure
- EMC shield plates allow motor lead shields to be grounded at the drive
- NEMA 4X disconnect switch provides local lockout to the GS20X drive
- Remote keypads
- Bezels
- Cables
- Backup power supplies
- Memory modules
- DIN rail mounting adapters
- Potentiometer
- Replacement cooling fans
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