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 and WEG brands, with various environmental ratings and control modes.
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.
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WEG CFW100 Drives
Micro drives offering sensorless vector (SVC), scalar (V/F) or voltage vector (VVW) control
DURApulse GS10 Drives
Compact sensorless vector (SVC) or scalar (V/F) drive units
DURApulse GS20 AC Drives
Several speed control modes available: standard V/Hz with pulse input feedback, sensorless vector control (SVC), and ultra precise field oriented vector control (FOC).
WEG CFW300 Drives
High-performance VFD in reduced compact size offering scalar (V/Hz) or voltage vector (VVW) control
WEG CFW500 AC Drives
Closed-loop flux vector and torque control modes available in sizes up to 60 hp
DURApulse GS4 AC Drives
Sensorless vector technology up to 300 hp VFD
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 20 hp.
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.
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.
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.
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 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.
Larger AC drives also require that dynamic braking units be used in conjunction with the appropriate braking resistors.
Drive configuration and programming software 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.
Option cards are available to increase the available I/O or add communications capabilities.
Replacement cooling fans for drives are direct replacements, dimensionally and electrically equivalent to the original part. Fan electrical loading is included in the input amperage ratings of the drives, and the DC voltage to power the fans is provided internally by the drives.
An assortment of accessories to complete your VFD installation includes: