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14. REMOVING MALFUNCTIONS
Description of
malfunction
Possible causes of malfunction
Measures of prevention/removal
Fan won’t work
Incorrect connection to power supply
Check for proper connection to power supply.
Locked impeller
Remove cause of locking
Damaged motor
Report at JUWENT service department
Low fan perfor-
mance
Incorrect impeller rotational direction (not in accor-
dance with marking on fan enclosure)
Change polarity of power supply connection
Contaminated fan inlet grate
Clean inlet grate
Fan high vibrations
Incorrect fan - roof base or roof base - fan connec-
tion.
Check for correct connections
Contaminated or damaged impeller
Remove impeller contaminations.
Report any impeller damages at JUWENT service depart-
ment
Fan
operates
with excess noise,
knocks
Plays on connections between fan elements or on
connection between fan and roof base
Remove plays on connections by tightening bolts and
screws
Rubbing between impeller and enclosure
Report at JUWENT service department
Damaged motor bearings
Activation of mo-
tor overload pro-
tections
Damaged or worn bearings.
Damaged motor windings (break, overheat).
Damaged circuit-breaker or protection system.
Report at JUWENT service department
Incorrectly set protection relay.
Loss of one of supply phases
Check electrical installation and protection systems
15. INFORMATION
As to all issues concerning the roof fan please contact JUWENT Production Plant or our Representatives