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Our offices will be closed on Monday, May 29th, in observance of Memorial Day. FedEx paid priority & FREE delivery orders placed before 5:00PM ET on Friday, May 26th will ship same day (if paid for by CC or PO account in good standing). FedEx/UPS ground & freight orders have a 1:00PM ET cutoff. Orders placed after the Friday cutoff times will ship on Tuesday, May 30th.
High-Performance AC Variable Frequency Drives (VFD)
High-performance variable frequency drives (VFD) enable speed control for three-phase AC motors such as those in conveyors, fans, pumps, HVAC and material handling. Available in sizes up to 300hp offer advanced features such as STO, closed-loop vector control and a built-in logic controller.
High-performance AC drives are top-of-the-line drives that are usually specified when a high degree of
precision in speed control is required, when full torque is needed through the speed range of the motor
(full torque available at very low or zero speeds), or if a torque control mode is required (controlling
and maintaining torque as opposed to speed). These drives carry a higher price tag but provide these added benefits:
High-precision speed control - High-performance drives support very tight speed control tolerances when this is
important to an application with or without encoder feedback.
Full torque throughout the motor's speed range - High-performance VFDs always support some type of vector speed control.
Sometimes this is sensorless vector, which is an open-loop system that still allows for full torque from base speed
down to very low speeds; many models support closed-loop flux vector speed control which will support 100% of the drive's
available torque from base speed down to zero speed.
Torque control - Applications such as winders and tensioners, where the motor's torque needs to be varied and controlled
in lieu of motor speed, require a torque control mode. High-performance AC drives offer this control method.
High tech features - Most modern AC drives offer features such as dynamic braking and an integrated PLC as well as some
communications capabilities. High-performance VFDs take this to a new level with more powerful PLCs, advanced networking
capabilities, and safety features such as Safe Torque Off (STO) and Safe Stop 1 (SS1).
For part listings and specifications, go to Shop Now
WEG CFW500 high-performance AC drives in sizes up to 150hp and higher current 10hp drives
WEG CFW500 series drives are high-performance AC variable frequency drives that support closed-loop flux vector
speed control as well as torque control modes and can operate both AC Induction motors and permanent magnet AC
motors. These models are offered in an IP66/NEMA 4X enclosure up to 20hp and up to 150hp in an IP20 enclosure.
200-240 VAC 1-phase up to 3hp, 3-phase up to 40hp
380-480 VAC 3-phase up to 150hp
Control modes include Scalar, Vector Control (sensorless and closed-loop with encoder feedback), and VVW PM
(suitable for fan, pump and compressor)
Speed and torque control down to 0 (zero) rpm & precision of 0.01% for speed control are attainable with closed-loop encoder
feedback using vector control
0 to 500 Hz output frequency range
2.5 to 15 kHz adjustable switching frequency (5 kHz standard)
Speed and torque control down to 0 (zero) rpm & precision of 0.01% for speed control are attainable with
closed-loop encoder feedback using vector control
Linear and "S" ramp acceleration and deceleration
Motor slip compensation
Adjustable V/Hz profile
Adjustable output current limit
Flying start / ride-through
PID regulator & PID sleep mode
Built-in SoftPLC (Same programming software as other WEG VFDs CFW-WPS)
Built-in RS-485 (Modbus RTU) communication
Plenty of built-in I/O, expandable with option modules
Built-in 24VDC power supply (max. 150 mA)
STO - Safe Torque Off (TUV certified) with option module
Optional remote keypads
DURApulse GS4 AC Drives
The DURApulse GS4 series of AC drives includes many of the same standard features as our
other GS drives including dynamic braking, PID, removable keypad, and much more:
230 VAC 1-phase up to 25hp, 3-phase up to 100hp
460 VAC 3-phase up to 300hp
V/Hz control or sensorless vector control for improved speed regulation
100kA Short Circuit Current Rating (SCCR)
STO - Safe Torque Off (TUV certified)
Built-in PLC (up to 10k steps)
Built-in I/O capabilities:
- three analog inputs, two analog outputs
- one frequency output (high-speed pulse train)
- ten digital inputs, two digital outputs
- two STO inputs, two SPDT relay outputs
Expansion I/O slot accepts any one of three I/O option cards
- relay output card, AC input card, combination DC I/O card.
High speed communication interfaces:
Serial MODBUS RTU/ASCII and BACnet protocols built in,
Optional MODBUS TCP, EtherNet/IP communication cards
Flange mount capability
GS4 QuickStart menus that simplify configuration
- The smart keypad is designed with defaults to quickly configure the drive, set the speed, start
and stop the drive, and monitor critical application parameters. Up to four drive configurations can
be stored in the keypad, and transferred to additional DURApulse GS4 drives. Users
can also store up to 32 parameters in a custom Quick-Start menu.