Product Manual

M0112 – XB,HV,HVA,ADD,DDS,DDP
7
FAN TROUBLE SHOOTING GUIDE
PROBLEM POSSIBLE CAUSES
Impeller or sheaves loose
Belts not tensioned properly
Bent shaft
VIBRATION Out of balance impeller
Loose fasteners
Loose or worn bearings
Drive misalignment
Fan not properly installed
Mismatched belts
Out of balance sheaves
Improper fan installation
Static pressure higher than design
MOTOR OVERLOADING Impeller rotating in the wrong direction
Improper fan speed
Defective motor
Fan speed higher than design
Filters missing
TOO MUCH AIR Static pressure lower than design
Fan speed higher than design
Lack of electricity to the fan
Fan wired improperly
Broken or missing belt
FAN DOES NOT OPERATE Missing or blown fuses
Overload protection has broken circuit
Defective motor
Impeller or sheaves loose
Belts not properly tensioned
Sheaves not properly aligned
Impeller out of balance
Sheaves out of balance
EXCESSIVE NOISE Bent shaft
Bearings defective or need lubrication
Worn belts
Vibration or lack of isolation
Loose fasteners
High velocity air