Line Reactors are used on VFD line inputs to protect drives from current spikes and reduce harmonics. On VFD outputs, line reactors or output filters protect motors and are recommended for VFDs with non-inverter-duty motors. For motor wiring less than or equal to 100 feet, a line reactor is acceptable. For distances over 100 feet and up to 1,000 feet, using a VTF output filter is recommended.
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: