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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.
W12 platform motors with polymeric terminal box cover have the connection diagram printed on its interior.
To connect the cables, check on the nameplate the diagram code that must be used.
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 3 to 5 5 to 10 10 to 18
Terminal box cover
-
Drip cover installed in
1,5 to 2,3 3,5 to 5 6 to 9
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 W12 motors, do not exceed the maximum tightening torque of 8 Nm when fixing the foot and/or polymeric
flange on the equipment. When the motor is used in vertical shaft up position, fixed by foot, the foot must be
locked axially by the fixing of a flat socket head screw M5x0.8 measuring 16 mm length (W63 and W71) or 12
mm length (IEC56). The hexagonal holes of the C-80 and C-105 flanges of W12 motors are suitable for M5
(maximum torque 5 Nm) and M6 (maximum torque 8 Nm) screws, respectively.
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.
In motors with polymeric terminal box and/or its cover, ensure that the fittings and locks of these
components are correctly assembled after performing the cable connection.
The motor must be installed with overload protection devices. For three-phase motors, it is recommended to
install a phase failure protection device. When motor is fitted with temperature-monitoring devices in the stator
windings and/or bearings, they must be connected during the operation and even during tests.
Ensure the correct operation of the accessories (brake, encoder, thermal protection, forced ventilation, etc.)
installed on the motor before it is started.
Table 3.1 - Tightening torques for fixing elements [Nm]
M5
M6
M8
4 to 6,5 6,5 to 9
10 to 18 15,5 to 30
1)
28 to 40 45 to 70
3 to 5
4 to 8
8 to 15
18 to 30 25 to 40 30 to 45 35 to 50
14 to 20
3,5 to 5 6 to 9
14 to 20
M10
M12
M14
M16
-
30 to 50 50 to 75
-
115 to 170
-
-
-
-
-
-
Low and High Voltage Electric Motors | 5
M20
UNF 8x32 UNF 10x32 UNC 10x24
1 to 2
-
-
-
-
-
-
-
1 to 1,5
-
-
-
1,5 to 2
-
-
-
2,5 to 3
-
2,5 to 3
-
2,5 to 3
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