1336S-BRF75-AE-EN4 A-B Interface Module
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The energy efficiency aspect of VFDs is worth underscoring. Studies and field results consistently show large energy reductions when using variable speed drives in variable load applications. The affinity law for pumps and fans indicates power is proportional to the cube of speed, so even a modest 20% speed reduction can cut power use by ~50%. In practice, not every application runs at reduced speed all the time, but whenever a motor spends significant time below full load, a VFD saves energy. One study of greenhouse ventilation found that using VFDs to slow fans (instead of simple on/off cycling) cut the electrical consumption nearly in half while maintaining more stable climate control . Similarly, an industrial refrigeration system or air compressor with VFDs can modulate capacity and avoid inefficient stop-start cycles, leading to lower electricity bills and less wear. The cost savings from energy reduction can be substantial: for a large motor running continuously, energy costs dwarf the initial purchase price of the drive. It’s not uncommon to see payback periods under 1–2 years for VFD retrofits purely from energy saved. In some cases, ROI can be achieved in a matter of months , especially if utility rebates or incentives for energy-efficient upgrades are available
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