Fan vibration
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Why did the front bearing of the fan suddenly vibrate to its maximum level, triggering a shutdown sequence?
For vibrations, a setting of choosing two out of three is commonly used; as a result, the occurrence of false signals is very low. Therefore, you need to analyze what is causing the excess values
The fan impeller may become fouled, causing it to lose its dynamic balance.
Sudden vibrations may be caused by a part falling off the impeller
Maybe a piece of scale on the impeller has fallen off