3.1.2 Maintenance items: Operation analysis before maintenance <br>3.1.2.1 Process method: Record the following values before maintenance: <br>(1) Vibration value of fan and motor. <br>(2) Motor no-load current. <br>(3) Bearing temperature. <br>(4) Wind pressure at the outlet of the fan. <br>(5) The tightness of the fan casing, and the leaks are marked with red paint.
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