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8.0 SYSTEM MALFUNCTIONS DURING OPERATION
For all inspections, point 4.2. must be considered.
Possible malfunctions and solutions:
The fan does
not operate
Air volume is
too low
Thermal
protection
switches off
Noise
Vibrations
If the reason for the malfunction can not be clearly determined, inform the customer service
of the manufacturer.
After a case of fire the fan must be checked by the manufacturer.
9.0 GUARANTEE
Guarantee will be valid only if transport, storage, installation, connection and periodical
maintenance have been executed in compliance with the above instructions and local
regulations regarding electric installation and fire protection. For validity of the guarantee
duly filled and signed control report has to be submitted.
Check connection to the mains and thermal protection. If ok. check
electric motor. If a motor with separated windings is installed, check all
speeds. If necessary get the electric motor repaired.
Check the direction of rotation. If wrong, change the supply connection of
any 2 phases. Check if current is similar all phases. If ok. check
operating point and system design.
Compare the data of electric motor with setting of thermal protection. If
ok. check power supply and electric motor (short-circuit, damage to the
bearings, impeller blocked or touching the casing). Get the electric motor
or if necessary the complete fan repaired.
Overcurrent. Check the direction of rotation. If wrong, change the supply
connection of any 2 phases. Check if current is similar all phases.
Damage to the bearings, impeller blocked or touching the casing.
Get the electric motor or if necessary the complete fan repaired.
Check operating point and system construction. If the actual pressure
drop of the system is higher than supposed, the fan could operate in an
instable area of the fan curve. Inform customer service of the
manufacturer.
Damage or dust layer on impeller.
Clean the impeller, if necessary balance it or replace it.
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