Series features
Our Active Harmonic Filters (AHF) are designed to be a total system solution, providing real time cancellation of the 2nd to 51st harmonics while providing real time step-less capacitive and inductive compensation and perfect reactive power compensation. These provide perfect load balancing on all phases, all the time on 208V, 240V, 480V, 600V, and 690V systems without using transformers.
Other benefits of our AHF series include flicker reduction, improvement of lagging & leading Power Factor at input to loads, reduction of Apparent Power (kVA) consumption at the supply source, as well as resolving the need for oversized neutral conductors and avoiding nuisance tripping of MCCBs.
See AHF Drawing for an example of enclosure dimensions, and contact us for more specifications and details.
Series Comparison: EDF vs FAPFCU vs AHF
EDFs are not a systems solution like our Filtered Auto PFC Units or our Active Harmonic Filters are; they are designed for preventing harmonic distortion on a single Variable Frequency Drive (VFD). When there is one or two VFDs in a system, we recommend EDFs for harmonic filtering. We recommend our Active Harmonic Filters when there is more than one or two VDFs, as they will filter harmonics across the system. Our FAPFCUs are filtered to protect the unit itself from the harmonics in a system – not to provide system filtration. The FAPFCUs are recommended for PFC needs in harmonic contaminated systems.
EDFs and are more robust, easier to set up and troubleshoot, and filter above the 50th harmonic, but cannot load balance.
Both EDFs and APFCUs can operate without line reactors on VFDs and operate with downstream passive filters or capacitors.
APFCUs have replacement parts more readily available and reduce utility side harmonics, but cannot load balance.
AHFs load balance, are smaller and lighter, reduce harmonic reduction on the load side of the main transformer, have the best reaction time to load changes, are field expandable, and have 3-phase power metering. AHFs cannot operate without line reactors on VFDs or operate with downstream passive filters or capacitors.
NEMA Types
Type 1: Indoor. Protects equipment from falling debris.
Type 2: Indoor. Protects equipment from falling debris and dripping water from sprinkler systems.
Type 12: Indoor. Protects equipment from falling debris, circulating dust, and dripping water from sprinkler systems.
Type 3: Outdoor. Protects equipment from falling debris, windblown dust, rain, and snow. Withstands external formulation of ice.
Type 3R: Outdoor. Protects equipment from falling debris, rain, and snow. Withstands external formulation of ice.
Type 4: Outdoor. Protects equipment from falling debris, windblown dust, rain, snow, and hose directed water. Withstands external formulation of ice.
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