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Troubleshooting
WARNING
Before taking any corrective action, make certain
unit is not capable of operation during repairs.
Problem
Excessive Noise
Low CFM
High CFM
Static Pressure Wrong
High Motor Amp Draw
Fan Doesn't Operate
Overheated Bearing
Excessive Vibration
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor
and result in motor failure. Do not exceed the maximum cataloged rpm of the fan.
®
Cause
Wheel Rubbing Inlet
V-Belt Drive
Bearings
Wheel Unbalance
Fan
Duct System
Fan
Duct System
Duct system has more
or less restriction than
anticipated
Fan
Duct System
Electrical Supply
Drive
Motor
Micro Drive
Lubrication
Mechanical
Belts
System Unbalance
AVERTISSEMENT
Avant d'entreprendre toute action corrective,
s'assurer que l'appareil ne pourra pas fonctionner
durant les réparations.
Corrective Action
Adjust wheel and/or inlet cone.
Tighten wheel hub or bearing collars on shaft.
Tighten sheaves on motor/fan shaft. Adjust belt tension.
Align sheaves properly (see procedure).
Replace worn belts or sheaves.
Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Clean all dirt off wheel. Check wheel balance.
Check wheel for correct rotation.
Higher pressure than design. Filters need replacement.
Decrease fan speed.
Resize ductwork. Access door, filters, dampers not
installed.
Remove obstructions in system. Use correction factor to
adjust for temperature/altitude. Resize ductwork. Clean
filters/coils. Change fan speed.*
Check rotation of wheel. Reduce fan speed.
Resize ductwork. Check proper operation of isolation and
bypass dampers. Check filters and access doors.
Check fuses/circuit breakers. Check for switches turned
off or disconnected. Check for correct supply voltage.
Check for broken belts. Tighten loose pulleys.
Assure motor is correct horsepower and not tripping
overload protector.
Check drive alarms and resolve. See drive manual for
more information. Model J1000 at www.yaskawa.com
OR call 1-847-887-7457, prompt 2 (7:00 am to 5:30 pm -
central standard time (CST) - Monday thru Friday).
Check for excessive or insufficient grease in the bearing.
Replace damaged bearing. Relieve excessive belt tension.
Align bearings. Check for bent shaft.
Adjust tightness of belts. Replacement belts should be a
matched set.
Check alignment of shaft, motor and pulleys. Adjustable
pitch pulleys with motors over 15 hp are especially
prone to unbalance. Check wheel balance, rebalance if
necessary.
Universal Single Width Fans
23
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