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How to Diagnose a Blower System Using Current, Pressure and Airflow Data
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High blower current is a warning, not a complete diagnosis. It can result from supply problems, an unsuitable operating point, incorrect settings, restricted cooling, mechanical damage or a measurement mistake. The correct interpretation depends on the exact blower design and controller.
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Low blower airflow can appear as wet products, weak cleaning, poor aeration or a longer process cycle. Yet “low airflow” is often inferred from the process rather than measured. Pressure, velocity and airflow are related, but they are not interchangeable.
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The air-knife gap is a small dimension with system-wide consequences. Changing it alters the discharge area, resistance, total air demand and pressure inside the knife. It can also change jet uniformity and the way water or debris leaves the product.
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Use process-point measurements, the exact blower curve and electrical limits to decide whether useful pressure can be recovered without a larger motor.
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