7
Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
ASSEMBLY
Prior to commissioning for all motors:
Rotate the motor at no load (no mechanical load)
for 2 to 5 minutes, checking that there is no abnormal
noise. If there is any abnormal noise, see section 5.
2.2 - Location - ventilation
2.2.1 - TEFV motors
Our motors are cooled in accordance with method IC 411
(standard IEC 34-6), i.e. «machine cooled by its surface, using
the ambient fluid (air) flowing along the machine».
The fan at the non drive end cools the motor. Air is sucked in
through the grille of a fan cover (which provides protection
against the risk of direct contact with the fan in accordance with
standard IEC 34-5) and blown along the housing fins to ensure
thermal equilibrium of the motor whatever the direction of
rotation.
2.2.2 - Drip-proof motors
Location ventilation
Our motors are cooled in accordance with method IC 01
(standard IEC 34-6), ie. «machine cooled by means of the
ambient fluid (air) circulating inside the machine».
A fan at the non-drive end cools the motor. Air is sucked in at
the front of the motor and blown along the fan cover to ensure
thermal equilibrium of the motor whatever the direction of
rotation.
H
Ø H
max
air
inlet
The motor must be installed in an adequately ventilated area,
with clearance for the air intake and outlet of at least onequarter
of the frame size.
Obstruction (clogging) - even accidental - of the fan cover grille
has an adverse effect on motor operation.
In the case of vertical operation with the shaft extension facing
down, it is advisable to fit the motor with a drip cover to prevent
penetration by any foreign bodies.
It is also necessary to check that the hot air is not being
recycled. If it is, pipes must be provided for the intake of cold
air and the discharge of hot air, in order prevent abnormal
motor temperature rise.
In this case, if the air is not circulated by an auxiliary fan, the
dimensions of the pipes must be such that the pressure losses
are negligible compared to those of the motor.
Positioning
The motor must be mounted in the position specified on
the order, on a base which is rigid enough to prevent
distortion and vibration.
Where the motor feet have six fixing holes, it is preferable to
use those which correspond to the standard dimensions for the
motor power rating (refer to the technical catalogue for
induction motors), or, failing that, to those shown at B2.
Ensure there is easy access to the terminal box, the
condensation drain plugs and, if appropriate, to the grease
nipples.
Use lifting equipment which is compatible with the weight of the
motor (indicated on the nameplate).
When the motor is fitted with lifting rings, they are
for lifting the motor on its own and must not be
used to lift the whole machine after the motor has been
fitted to it.
Note 1: When installing a suspended motor, it is essential
to provide protection in case the fixing breaks.
Note 2: Never stand on the motor.
2.3 - Coupling
Preparation
Turn the motor by hand before coupling to detect any possible
fault due to handling.
Remove any protection from the shaft extension.
Drain off any condensation water which may have formed
inside the motor by removing the plugs from the drain holes.
Rotor locking device
For made-to-order motors with roller bearings, remove the
rotor locking device.
In exceptional circumstances when the motor has to be moved
after the coupling device has been fitted, the rotor must be re-
immobilised.
1/4 H min
(with a minimum
distance of 25 mm)
H
B
2
B
1
