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Troubleshooting
Trouble Cause Remedy
Low air flow
Low power absorption
System congestion. Clean the entire system.
Obstacles to the air flow.
Check the real obstacles area and the inlet shape towards
the original design.
In dry-coolers the minimum free height of the inlet area has
to be 1 time the fan diameter at least; this height has to be
higher in case of multiple units in line.
Static pressure higher than the specified
one.
Increase blade pitch angle (till 3º after checking the data
sheet selection.
Pitch angle lowered by blade rotation
(e.g. screw (15) not tightened at the right
torque).
Set the right pitch angle and refer to the operation manual
to set the right torque of screws and bolts.
Temperature higher than the design.
Increase blade pitch angle (till 3º after checking the data
sheet selection.
High power absorption
Temperature lower than the design.
Decrease blade pitch angle (till 3º after checking the data
sheet selection.
Static pressure lower than the design.
Decrease blade pitch angle (till 3º after checking the data
sheet selection.
Rubbing between the
blades and the fan ring
Screws and bolts of the fan and/or the
structure loosened.
Torque all screws and bolts.
Fan not centered.
Tip clearance too small.
Center the fan.
Increase the fan ring diameter.
High vibration level
Unbalance of one or more blades. Contact SPX Cooling.
Blade pitch angle not included in the 0.5º
tolerance.
Set right blade pitch angle.
Blades too close to supports (periodic aero-
dynamic turbulence).
Contact SPX Cooling.
Resonance between one of the possible
forcing frequencies of the fan and one or
more of the vibration modes of the structure
on which it is installed.
Contact SPX Cooling.
Vibration transmitted by the structure on
which the fan is installed.
Contact SPX Cooling.
Resonance of the blades with one of the
possible forcing frequencies.
Contact SPX Cooling.
Misalignment of the drive shaft. Realign of the drive shaft.
Worn output shaft bearing. Contact the supplier.
The fan and/or the structure bolts are not
tightened.
Tighten screws and bolts at the right torque.
The draining holes of the blades are ob-
structed.
Open the draining holes.