NCF fan
times the diameter of the impeller between the fan
intake and the nearest wall or machine. See
.
4.5.3 Electrical connections
• The NCF fan´s power supply line must have a suffi-
ciently high power rating.
• Connection to the main power grid must only be car-
ried out by qualified personnel. Also, the client is re-
sponsible for the entire electrical system up to mo-
tor terminal board.
• Remember the importance of installing a safe con-
nection to earth for the NCF fan. The earth connec-
tion system must comply with legislation in effect
in the country of installation and must be periodic-
ally checked by qualified personnel. Make the con-
nection to earth before any other connection. Check
that the connection layout is suited to the mains
power voltage.
• Usually, standard electric motors can run in both dir-
ections indifferently. To invert the direction of rota-
tion, simply swap over any two power cables directly
on the terminal board.
• The client must also install an electrical disconnect-
ing device near the NCF fan so that maintenance
personnel can have direct control over the power
supply to the NCF fan.
• All work performed on the electrical system must
only be carried out with the NCF fan at rest and elec-
trically disconnected from the mains.
• Before installing/starting up, ensure that the in-
formation on the identification plate on the motor is
compatible with the main power supply.
4.5.4 Motor connections
See
. Check the data on
the motor identification plate for which connection to
be used.
4.6 Connection to ducts
NOTE!
Installations with an open air intake are not re-
commended.
• The NCF fan must be connected to ducting with
all parts correctly aligned, without obstructions to
air flow from gaskets or flexible components. The
weight of ducting must not be supported by the NCF
fan, and deformations of parts of the machine by
ducting connections must be avoided. Any flexible
joints between the NCF fan and intake and/or exit
ducts must be installed in a way that prevents stress
on flexible components, and that avoids contacts
between metallic parts of the joints (see
).
4.7 Checks to be made before and after
starting
4.7.1 Preliminary checks
WARNING! Risk of personal injury
Preliminary checks must only be performed
with the NCF fan at rest and disconnected from
the power supply.
Close off the air intake partially to reduce the power
peak at start-up and the motor starting time.
When starting the NCF fan for the first time, the fol-
lowing preliminary checks are necessary:
• Check that all bolts are correctly tightened (impeller,
supports, foundation bolts, and transmission com-
ponents).
• Check that the impeller can turn freely.
• Check that there are not foreign objects inside the
NCF fan.
• Check that the NCF 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 rota-
tion, 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 NCF fan immediately and
contact the manufacturer.
• The NCF fan must run without excessive vibration
and noise.
• Check, with the NCF fan at rest and at an outside air
temperature of 20°C, that the bearings do not ex-
ceed the maximum operating temperature (maxim-
um bearing temperature 70°C).
• During the first few hours of operation, it is normal
for the bearings to reach slightly higher temperat-
ures, 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 NCF 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 fre-
quently or replace the guard.
For mesh guards, checks must be made for the follow-
ing:
• Corrosion or dullness of galvanized surfaces
EN
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