11
NCF
the country of installation and must be periodically
checked by qualified personnel.
Make the connection to earth before any other con-
nection. Check that the connection layout is suited to
the mains power voltage.
Usually, standard electric motors can run in both direc-
tions 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!
The client and/or the installer of the
electric system is responible for choos-
ing 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 dis-
connected 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.
Delta connections
Delta connection with a single-speed motor.
Star connections
Star connection for single-speed motor.
CHECKS TO BE MADE BEFORE AND
AFTER STARTING
Preliminary checks
Preliminary checks must only be per-
formed with the fan at rest and discon-
nected from the power supply.
When starting the fan for the first time, the following
preliminary checks are necessary:
•
Check that all bolts are correctly tightened (rotor,
supports, foundation bolts, and transmission com-
ponents).
•
Check the lubrication of the fan and motor bear-
ings; if necessary, regrease (see Maintenance).
•
Check that all rotating parts 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 Electrical connections).
You may now start the fan. With centrifugal fans, close
off the air intake partially to reduce the power peak at
start-up and the motor starting time.
