How to adjust the number of fan rotations
Note!
Considering the motor size and the allowed working range of the fan the adjustment of
the number of fan rotations should be done by a specialist.
Adjustment of fan
pulleys
By pulley-driven fans the motor and fan shafts have Taperlock pulleys for quick change
of fan rotations.
The number of fan rotations is defined by the number of motor rotations and the relation
between the diameters of the two pulleys.
Dependent on the motor size the pulleys have 1-, 2- or 3 grooves.
Illustration
Taperlock pulley:
Part/function
This scheme applies to the above drawing:
Part
Function
1 Taperlock
2 Pulley
3 Screws
Procedure
Do as follows to replace the pulleys:
Step
Action
1
Unscrew the Allen screws
e
and pull off the pulley
d
from the motor shaft
2
Fit a new pulley, smaller or larger, that matches the requested RPM and re-
fix the Allen screws
Continues overleaf
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