WEG W01 Manual De Instalación, Operación Y Mantenimiento página 4

Those motors with feet must be installed on bases duly planned in order to prevent vibrations and assure perfect
alignment. The motor shaft must be properly aligned with the shaft of the driven machine. Incorrect alignment,
as well as improper belt tension, will certainly damage the bearings, resulting in excessive vibrations and even
causing the shaft to rupture. The admissible shaft radial and axial loads indicated in the general manual of the
website must be respected. Use flexible coupling whenever possible. When motors are fitted with oil lubricated
bearings or oil mist lubrication systems, connect the cooling and lubrication tubes (where provided).
For oil lubricated bearings, the oil level must be in the center of the sight glass.
Only remove the corrosion protection grease from the shaft end and flange immediately before the motor
installation.
Unless specified otherwise in the purchase order, WEG motors are dynamically balanced with "half key" and
without load (uncoupled). The driving elements, such as pulleys, couplings, etc., must be balanced with "half
key" before they are mounted on the shaft of the motors.
Observe the correct assembly position of the drains as indicated in the manual on the website www.weg.net
Do not cover and block the motor ventilation openings. Ensure a minimum clearance of ¼
(25%) of the diameter of the air intake of the fan cover from the walls. The air used for cooling
the motor must be at ambient temperature, limited to the temperature indicated on the motor
nameplate.
Motors installed outdoors or in the vertical position require the use of additional shelter to protect them
from water; for instance, use of a drip cover.
To prevent accidents, ensure that the grounding connection has been performed according to the
applicable standards and that the shaft key has been securely fastened before the motor is started.
Connect the motor properly to the power supply by means of safe and permanent contacts, always
considering the data informed on the nameplate, such as rated voltage, wiring diagram, etc.
For power cables and grounding system connections, terminal box and drip cover assembly, the tightening
torques indicated on Table 3.1 must be respected.
Component M4
Terminal block pins 1 to 1,5 2 to 4
Grounding
1,5 to 3
Terminal
-
box cover
Drip cover installed in
1,5 to 2,3 3,5 to 5
the fan cover
Drip cover installed in
-
NDE shield
1) For 12-pin terminal block, the tightening torque range allowed is: minimum 1.5 Nm and maximum 2.5 Nm.
For power cables, switching and protection devices dimensioning, consider the rated motor current,
the service factor, and the cable length, among others. For motors without terminal block, insulate the
motor terminal cables by using insulating materials that are compatible with the insulation class informed
on the nameplate. The minimum insulation distance between the non-insulated live parts themselves
and between live parts and the grounding must meet the applicable standards and regulations for each
country.
Take the required measures in order to ensure the degree of protection indicated on the
motor nameplate:
- unused cable inlet holes in the terminal boxes must be properly closed with blanking
plugs;
- the cable entries used must be fitted with components, such as, cable glands and conduits;
- components supplied loose (for example, terminal boxes mounted separately) must be properly
closed and sealed;
- fixing elements mounted in the threaded through holes in the motor enclosure (for example, the
flange) must be properly sealed.
4 | Low and High Voltage Electric Motors
Table 3.1 - Tightening torques for fixing elements [Nm]
M5 M6 M8
4 to 6,5 6,5 to 9
1)
3 to 5 5 to 10 10 to 18
3 to 5 4 to 8 8 to 15
6 to 9 14 to 20
3,5 to 5 6 to 9 14 to 20
M10 M12 M14
10 to 18 15,5 to 30 - 30 to 50 50 to 75 1 to 2
28 to 40 45 to 70 - 115 to 170
18 to 30 25 to 40 30 to 45 35 to 50
- - -
- - -
UNF UNF
M16 M20
8x32 10x32
- -
- -
- - - 1 to 1,5
- - - 1,5 to 2
UNC 10x24
- -
- 2,5 to 3
- 2,5 to 3
-
2,5 to 3