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39
10.4
Faults and troubleshooting
Fan does not run
smoothly
Rotor imbalance
Contact the manufacturer
Adhesions on the rotor
Contact the manufacturer
Material decomposition on the rotor
due to aggressive material conveyed
Contact the manufacturer
Wrong direction of rotation of rotor
Contact the manufacturer
Deformation of rotor due to exces-
sive temperature
Contact the manufacturer
Install new motor and impeller
Check mounting
Air output of fan
too low
Wrong direction of rotation of rotor
Contact the manufacturer
Excessive pressure losses in the lines
Change the line routing
Flow regulators not or only partly
open
Check opening position on site
Intake or pressure ducts are blocked
Remove the blocks
Grinding sounds
when starting or
operating the fan
Intake line is strained
Loosen intake line and realign
Fan does not reach
nominal speed
Defective motor winding
Contact the manufacturer
Incorrectly configured fan
Contact the manufacturer
Motor does not
rotate
Mechanical blockage
Switch off, disconnect from the power
supply and remove the mechanical
blockage.
Faulty supply voltage
Check the supply voltage, re-establish the
voltage supply
Faulty connection
Disconnect from the power supply, cor-
rect the connection, see circuit diagram.
Temperature monitor has responded
Allow the motor to cool down, find and
resolve the cause of the fault, release the
reactivation lock if required.
Electronics/motor
overheated
Insufficient cooling
Improve cooling.
Ambient temperature too high
Lower ambient temperature.
incorrect operating point
Contact the manufacturer
Tab 8: Troubleshooting
Problem
Possible causes
Remedy
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