Nederman NCF, Инструкция по эксплуатации, Страница: 18 / 25

NCF EN
18
4.4.1 Minimum distances between components
If the available space permits, in installations where the intake is connected
to a pipe, we recommend fitting a straight length of pipe with a length
approximately 2.5 times the diameter of the fan rotor, to guarantee correct air
flow into the intake. See Figure 7.
With installations with an open air intake, we recommend leaving a distance
equal to approximately 1.5 times the diameter of the fan rotor between the
fan intake and the nearest wall or machine. See Figure 8.
4.4.2 Connections to pipes
Connections between the fan and pipes must be made ensuring that all
components are correctly aligned and that there are no obstructions in the
tubing caused by gaskets or flexible parts. The weight of the tubing must not
be supported by the fan and care must be taken not to deform any part of the
fan during tightening of the connections to the pipes.
NOTE!
We do NOT recommend installations with an open air intake.
4.4.3 Electrical connections
The fan’s power supply line must have a sufficiently high power rating.
Connection to the main power grid must only be carried out by qualified
personnel. Also, the client is responsible for the entire electrical system up to
motor terminal board.
We remind you of the importance of installing a safe connection to earth for
the fan. The earth connection system must comply with legislation in effect
in the country of installation and must be periodically checked by qualified
personnel. Make the connection 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 directions indifferently.
To invert the direction of rotation, simply swap over any two power cables
directly on the terminal board.
The client must also install an electrical disconnecting device near the fan so
that maintenance personnel can have direct control over the power supply to
the fan.
CAUTION! Risk of equipment damage.
The client and/or the installer of the electric system is responible for choosing
the equipment and cables used for connecting the fan electrically, based on
the dimensions of the motor installed and the characteristics of the main
power supply.
All work performed on the electrical system must only be carried out with the
fan at rest and electrically disconnected from the mains. Before installing/
starting up, ensure that the information on the identification plate on the
motor is compatible with the main power supply
4.4.4 Delta connections
See Figure 9.
4.4.5 Star connections
See Figure 10.