1336-L-SP1C A-B  Digital Input Module

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. Beyond process and energy benefits, VFDs contribute to a quieter and more comfortable work environment as well. Motors running slower generate less noise and vibration. In HVAC systems, for example, a fan under VFD control will often run most of the time at lower speeds, reducing air noise in ducts and mechanical noise in the fan itself. Maintenance staff also benefit from diagnostics that modern drives provide – most Allen-Bradley drives have built-in fault logging and communication of key parameters (voltage, current, thermal usage, etc.), which helps in proactive troubleshooting. High-end models even have predictive maintenance features; by tracking things like the usage of the drive’s cooling fan or the leakage current, the drive can alert when it’s time for preventative maintenance, avoiding unexpected downtime.

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