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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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Low blower pressure can stop drying, cleaning, aeration or conveying, but the gauge reading alone does not identify the fault. Pressure depends on where it is measured, how much air is moving and the resistance of the complete system.
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Blower overload is rarely prevented by one protective device alone. Reliable continuous operation depends on correct selection, a stable air path, suitable electrical protection, adequate cooling and maintenance readings that reveal deterioration before a trip.
