4 | Low and High Voltage Electric Motors
3. INSTALLATION
Remove the transportation devices and shaft locking device (if supplied) before starting the motor installation.
Motors must be only installed in places compatible with their mounting features and in applications and
environments for which they are intended.
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). 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, 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 be: 5.5 mm for rated voltage up to 690 V; 8 mm for voltages up to 1.1 kV;
45 mm for voltages up to 6.9 kV; 70 mm for voltages up to 11 kV and 105 mm for voltages up to 16.5 kV.
In order to assure the degree of protection, unused cable inlet holes in the terminal
box must be properly closed with blanking plugs having and equal or higher degree of
protection to that indicated on the motor nameplate.
The motor must be installed with overload protection devices. When motor is fitted with temperature-
monitoring devices, 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.
Motors fitted with Automatic Thermal Protectors will reset automatically as soon as
the motor cools down. Thus, do not use motors with Automatic Thermal Protection in
applications where the auto-reseting of this device may cause injuries to people or damage
to equipment. Motors fitted with Manual Thermal Protectors require manual reset after they trip. If
the Automatic Thermal Protector or the Manual Thermal Protector trip, disconnect the motor from
During the installation, the motors must be protected against accidental energization.
Check the motor direction of rotation, turning it without load before it is coupled to the
load.
Periodically and mainly before the initial star-up, measure the insulation resistance of the motor winding.
Check the recommended values and the measuring procedures in the website.
Содержание Reavell 5236
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