TXP Inst. & Maint. Manual: IM-825
55
Disturbance
Possible cause
Solution
Fan switches off
For fans with frequency invert-
ers: motor winding too hot
Eliminate cause of too
hot motor winding
Fan does not
bring desired per-
formance
Direction of rotation impeller
wrong
Correct direction of rota-
tion
Pressure losses in the system
higher than expected
Medium temperature higher than
when designed
Filter polluted
Cleaning filters
Object obstructs air passage in
plant / flap closed
Checking the plant
For customers own frequency
inverter: wrong corner frequency
(max. frequency) set.
Set the corner fre-
quency (max. fre-
quency) correctly
For fans with customer-owned
frequency inverter: frequency in-
verter is not properly parameter-
ized
Frequency inverter is
correct parameterizing
Impeller runs rest-
less
Contaminated impeller
Clean the impeller and
avoid contamination in
the future (install filters!)
Impeller defective
Replacing the impeller
Vibrations are transferred from
the environment / system to the
fan
Use rubber isolators
and compensators
Connection on suction and pres-
sure side connected with voltage
Connect without voltage
or use compensators
Grinding Noises
Noise shear sat at the storage
Swapping bearings
Table. 11: Troubleshooting