22
KF T120 EC
Problam
Possible causes
Corrective measures
Fan doesn’t operate smoothly
Impeller’s imbalance
Rebalance ant the specialized company
Adhesions on the impeller
Clean carefully, rebalance, if necessary
Material decomposition on the impeller due to aggres-
sive material conveyed
Contact the manufacturer or its representative
Wrong direction of rotation of impeller
Contact the manufacturer or its representative
Deformation of impeller due to excessive temperature
Contact the manufacturer or its representative. Install
new impeller. Check mounting
Air output of the fan is too low
Excessive pressure losses in the ducting
Change the ducting routing
Airflow regulators are not or only partly opened
Check the opening position
Intake or exhaust air ducts are blocked
Remove the blocking
Grinding sounds when starting
or operating the fan
Intake line is strained
Loosen intake line and realign
Thermal contacts or resistors
have triggered
Motor blocked
Contact the manufacturer or its representative
Fan can’t reach nominal speed
Regulating devices are not adjusted properly
Check if control device is adjusted correctly
Defective motor winding
Contact the manufacturer or its representative
Motor does not rotate
Mechanical blockage
Switch off the fan, disconnect from the power supply
and remove the blockage
Incorrect supply voltage
Check the supply voltage, resume the voltage supply,
and start the fan
Incorrect electrical connection
Disconnect from the power supply, correct the electrical
connection according presented connection scheme
Temperature indicator has responded
Allow the motor to cool down, find and eliminate the
cause, release reactivation lock if applicable
Electronics or motor have
overheated
Insufficient cooling
Improve cooling. Let fan to cool down. In order to reset
the fault, turn off the supply voltage at least for 25 sec
and turn on again
Ambient temperature to high
Lower ambient temperature
Impermissible operating point
Change the operating point. Let device to cool down
