Bx/U/2016
24/37 tel. (22) 751 95 50
www.venture.pl
fax. (22) 751 22 59
Appendix - D (EXAMPLES OF DEVICE FAULTY WORKING)
Symptoms
Possible reason
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 high 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
