NCF
EN
24
When starting the fan for the first time, the following preliminary checks are necessary:
•
Check that all bolts are correctly tightened (impeller, supports, foundation bolts, and
transmission components).
•
Check that the impeller can turn freely.
•
Check that there are not foreign objects inside the fan.
•
Check that the fan turns in the correct direction: power the motor for a brief moment
to see if it turns in correct direction indicated by the arrow on the fan housing; if
necessary, invert the direction of rotation (see Section
4.5.3. Electrical connections
).
4.7.2
Checks to be carried out with the fan running
Check that the power absorption does not exceed the value indicated on the motor
identification plate, if it does; stop the fan immediately and contact the manufacturer.
The fan must run without excessive vibration and noise.
Check, with the fan at rest and at an outside air temperature of 20°C, that the bearings do
not exceed the maximum operating temperature (maximum bearing temperature 70°C).
During the first few hours of operation, it is normal for the bearings to reach slightly higher
temperatures, as long as they later stabilise at a lower value. In the event of overheating of
the bearings, contact the Nederman technical assistance department.
After 3 - 4 operating hours, with the fan at rest and disconnected from the power supply,
check again that all bolts are correctly tightened and the bearing temperature.
4.7.3
Visual checks on guards
CAUTION!
Risk of equipment damage.
•
All guards must be inspected every month and replaced if necessary.
•
In case of doubts, carry out checks more frequently or replace the guard.
For mesh guards, checks must be made for the following:
•
Corrosion or dullness of galvanized surfaces
•
Detachment of rivets/welds
•
Evidence of noises typical of loose guards
•
Impacts and permanent deformation of components
•
Breakage of wires
•
Corrosion of fasteners
•
Slackening of fixing elements
For guards in pressed and painted sheet metal, checks must be made for the following:
•
Corrosion or dullness of painted surfaces
•
Detachment of rivets/welds
•
Evidence of noises typical of loose guards
•
Impacts and permanent deformation of components
•
Mechanical deformation or breakage of guards
•
Presence of cracks
•
Corrosion of fasteners
•
Slackening of fixing elements
