SECTION 9
9-29
01/01/2014
FAN VIBRATION: CAUSE AND PREVENTION
EXTREME DAMAGE CAN OCCUR FROM FAN VIBRATION. THE MAJOR CAUSE OF
VIBRATION IS RELATED TO DUST ACCUMULATION AND IMPROPER MAINTENANCE OF THE
FAN ASSEMBLY AND FAN MOTOR.
DURING THE DRYING PROCESS, A CONSIDERABLE AMOUNT OF DUST IS DISPERSED
INTO THE AIR. THIS AIR IS CHANNELED ACROSS THE MOTOR AND FAN INTO THE
PLENUM CHAMBER. THE DUST CAN COLLECT ON THE MOTOR AND ON THE INSIDE OF THE
FAN HUB OR THE CENTER PORTION OF THE FAN. THE AMOUNT OF DUST VARIES FROM
THE TYPE AND QUALITY OF PRODUCT BEING DRIED. WHEN A DRYER IS SHUT DOWN,
DUST MAY FALL OFF THE FAN HUB UNEVENLY. UPON RESTARTING, THIS ACCUMULATION
OF DUST WILL ACT AS EXTRA WEIGHT ON THE FAN, CAUSING THE FAN TO BE OUT OF
BALANCE. PREVENTIVE MAINTENANCE PROCEDURES TO ELIMINATE VIBRATION CAUSES
ARE AS FOLLOWS:
INSPECT THE
FAN HUB FOR DIRT
,
CHECK THE FAN BLADES
FOR
CHIPS, CRACKS AND PROPER SETTING, MAKE SURE ALL BOLTS ON THE BUSHING ARE
TIGHT
.
CHECK THE FAN MOTOR MAKING SURE MOTOR MOUNT BOLTS ARE SECURE
,
MOTOR
BEARINGS RUNNING COOL AND NOT NOISY
. MAJOR MOTOR MANUFACTURERS RECOMMEND
THAT MOTORS BE ROTATED A MINIMUM OF FIVE REVOLUTIONS EVERY THIRTY DAYS TO
PROVIDE PROPER LUBRICATION OF BEARINGS AND PREVENT MOISTURE CONTAMINATION
IN THE MOTOR HOUSING. INSPECT MOTOR AND FAN ASSEMBLY ENSURING FREE TURNING
OF FAN BLADES AND TO ENSURE PROPER CLEARANCE BETWEEN BLADES AND FAN DRUM.
FAN AND/OR MOTOR VIBRATION OVER A LONG PERIOD OF TIME WILL
EVENTUALLY CAUSE PROBLEMS. CHECK YOUR DRYER!
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