6 Care and Maintenance
6.2
6.2 Troubleshooting
Malfunction
Possible cause
Action
Unsteady operation of fan.
Material sticking to impeller
blades.
Carefully clean impeller.
Worn impeller.
Replace impeller.
Impeller deformed by heat.
Replace impeller.
Medium escapes at the shaft
seal.
Seal is faulty or worn.
Replace seal.
Fan produces a grinding noise.
Impeller rubs against inlet
nozzle.
Loosen housing cover an re-
align, check and correct duct
work if necessary.
Motor
noise
Check if bearings are damaged
and replace bearings if
necessary.
The power input indicated on the
rating plate is constantly
exceeded.
Air volume too much.
Reduce air volume using a
damper until the permissible
power input is reached.
Different speed with 60 Hz.
Check frequency.
