Cod. 985719 – 00 / July 2004
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4.2. INSTALLING THE DRIVE SYSTEM
We suggest to use the selection program “Ventil” to dimension correctly type and diameter of the pulleys, belt tension etc.
Pulleys should be statically and dynamically balanced with grade G4 according to ISO 1940. This is compulsory for ATEX
fans.
• Install the drive system with the following recommendations:
• mount the pulleys on the motor-fan shaft
• verify the alignment of pulleys and motor-fan shafts: a straight bar can be used to put on pulleys side plane
• grooves must be clean
• apply the belts, loosening the tensioning system to avoid a excessive extension of the belts and eventual damage
• tension the belts gradually
Belt tension depends on many factors: installed power, speed, type and dimension of pulleys etc.
It is very important to apply the correct tension which is one of the most important factors for a correct working of the fan.
Please refer to the data listed in the selection program “Ventil”.
4.2.1. Problems due to a too low belt tension
• Belts turn over in pulley grooves with excessive wear
• Excessive running noise
• Severe belt vibration
• Anomalous loads
4.2.2. Problems due to a too high belt tension
• Excessive loads on bearings, shaft and motor with a consequent decrease of their life
• Rise in loads on all the other components
• Increase in vibration and noise
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