RBH/2019/V1
tel. (22) 751 95 50
www.venture.pl
fax. (22) 751 22 59
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APPENDIX D - (EXAMPLES OF DEVICE FAULTY WORKING)
SYMPTOMS
POSSIBLE REASONS
Excessive vibration or
noise
•
Used or damaged impeller
•
Fan levelled in wrong way
•
Dirt accumulated on impeller caused loss of balance;
•
Impeller loss of balance
•
Parts rubbing;
•
Damage or wear of bearings;
•
Damage of measurement system, that is responsible for signalization of excessive vibration.
•
Deformed motor shaft;
•
Loose of impeller fix screw, impeller is loose on motor shaft;
•
Loss of balance of motor impeller or damage of motor (wear/damage of bearing)
Motor overload
•Rubbing between fan impeller and housing;
•Damage or wear of bearings;
•Damage of motor windings (overheat, insulation degradation, insulation breakdown etc.);
•Damage of switch or security system;
•Failure of one of supply phases;
•Exceeding of maximum motor speed;
•Too low flow
Failed fan start-up
•Rubbing between fan impeller and housing or foreign body (e.g. tool left after installation);
•Failure of one of supply phases;
•Failure of start-up system, e.g. Y/D
•Reset of security devices has not been made, wrong security device
•Motor connected in wrong way or damaged
•
Too low supply voltage
Protective devices
activation during fan
work and overheating
•Excessive start-up time
•Motor overload
•
Motor launching done too often (thermal protection – if applied or overheating)
•
Improper set of protection system e.g. in system with PTC or thermocontact sensors (if applied)
•Improper cross-section of power supply wires
•Lack of sufficient motor cooling eg. dirt placed on motor cooling impeller (thermal protection – if applied or
overheating)
Too low flow
•
Damage of device
•
Too low power supply frequency
•
Obstacles in ventilation installation
