Manual KVBF

14 Fault table, remedying faults
DANGER! Live wires and connections!
Risk of injuries from electric current!
Have all electrical work done by a trained electrician only!
DANGER! Risk of injuries to the eyes by residue or dust being swirled out when checking the
direction of rotation. When checking the direction of rotation of the rotor, wear
protective goggles!
If in doubt, get in touch with the manufacturer‘s after-sales service.
Fault Remedy
Fan does not start
Check energy supply and motor protection. If in order, check motor. In
motors with separated coils, check both speeds.
Volume ow too low
Check direction of rotation. If necessary, change direction of rotation of
motor by interchanging two phases. Check whether the intake area is
blocked. Check working point and version of the system.
Motor protection is triggered
Compare the motor data. If in order, check energy supply and motor
(short circuit, bearing damage, rotor blocked or grinding), contact after-
sales service.
Abnormal noises occur
As a matter of principle: noise development in a fan greatly depends on
the installation situation and the operating conditions. For this reason, no
generally valid noise data can be given, they always relate to the measu-
red conditions. They can be seen from our data sheets.
Possible source of fault:
• bearing damage on the motor, rotor blocked or grinding
• rotor imbalanced or damaged
• rotor runs in the breakdown area
• loose components.
Have the motor or possibly the entire fan repaired.
Vibrations
Check working point and version of the system. If the actual total resis-
tance of the system is higher than planned, this may result in the fan
working in the breakdown area for some types.
Contact the manufacturer‘s after-sales service.
Damage or dust accumulations on the rotor.
Check welding seams on the housing.
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AX - 12.2012
Smoke and heat exhaust fans