WEG M4 Manual For Installation, Operation And Maintenance

MANUAL FOR
INSTALLATION,
OPERATION AND
MAINTENANCE
LOW VOLTAGE
ELETRIC MOTORS
1. Introduction
The installation, operation and maintenance of the motor must be always
performed by qualified personnel using proper tools and methods and
following the instructions contained in the documents supplied with the motor.
The instructions presented in this document are valid for WEG motors with the
following characteristics:
Three-phase and single-phase induction motors (squirrel cage rotor);
J
Three-phase permanent magnet motors;
J
Three-phase hybrid motors (squirrel cage rotor + permanent magnets);
J
The objective of this manual is to provide important information, which must be
considered during the shipment, storage, installation, operation and maintenance of
WEG motors. Therefore, we advise to make a careful and detailed study of the
instructions contained herein before performing any procedures on the motor. The
noncompliance with the instructions informed in this manual and others mentioned
on the website www.weg.net voids the product warranty and may cause serious
personal injuries and material damages.
Electric motors have energized circuits and exposed rotating parts
which may cause injuries to people.
2. Shipment, storage and handling
Check the conditions of the motor immediately upon receipt. When any damage is
noticed, this must be reported in writing to the transportation company, and
immediately communicated to the insurance company and to WEG. In this case, no
installation job can be started before the detected problem has been solved.
Check if the nameplate data matches the invoice data and the environmental
conditions in which the motor will be installed. If the motor is not immediately
installed, it must be stored in a clean and dry room protected against dust,
vibrations, gases and corrosive agents, and with relative humidity not exceeding
60%. In order to prevent water condensation within the motor during the storage
period, it is recommended to keep the space heater ON (where provided).
In order to prevent oxidation of the bearings and ensure an even distribution of the
lubricant, rotate the motor shaft at least once a month (at least five turns), always
leaving it in a different position.
For bearings with oil mist lubrication systems, the motor must be stored horizontally,
independently from the mounting configuration, with ISO VG 68 oil in the bearing,
(the amount is indicated in the motor manual available on the website www.weg.net)
and the shaft must be turned weekly.
If motors with open bearings are stored longer than six months, the bearings must
be relubricated with the amount of grease indicated on the nameplate before the
commissioning of the motor. If the motors are stored for more than two years, it is
recommended to change the bearings, or to remove, wash, inspect and relubricate
them before the motor is started. After this storage period, it is also recommended
to change the start capacitors of single-phase motors since they loss their operating
characteristics.
Always handle the motor carefully in order to prevent impacts and
damages to the bearings and always install the shaft transportation/
locking device (if supplied) when transporting the motor.
For power cables and grounding system connections, terminal box and drip cover
assembly, the tightening torques indicated on Table 1 must be respected.
Table 1 - Tightening torques for fixing elements [Nm]
M4 M5 M6 M8 M10
Component
1
Terminal Block /
2 to 4 4 to 6.5 6.5 to 9 10 to 18
1)
Flying leads to 1.5
1.5
3 to 5 5 to 10 10 to 18 28 to 40 45 to 70
Grounding
to 3
4 to
Terminal box
- 3 to 5 8 to 15 18 to 30 25 to 40 30 to 45 35 to 50
cover 8
Drip cover
1.5 6 to
3.5 to 5 14 to 20 -
installed in the
to 2.3 9
fan cover
Polymeric fan - -
- 6 to 8 6 to 8
cover
1) For 12-pin terminal block, the tightening torque range allowed is: minimum 1.5 Nm
and maximum 2.5 Nm.
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 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
J
blanking plugs;
The cable entries used must be fitted with components, such as, cable
J
glands and conduits;
Components supplied loose (for example, terminal boxes mounted
J
separately) must be properly closed and sealed;
Fixing elements mounted in the threaded through holes in the motor
J
enclosure (for example, the flange) must be properly sealed.
Do not handle the motors by the polymeric components: fan cover,
terminal box and / or terminal box cover. Use only the eyebolts to lift the
motor. However these eyebolts are designed for the motor weight only. Thus
never use these eyebolts to lift the motor with additional loads coupled to it.
The lifting eyebolts of the terminal box, fan cover, etc., are intended to handle
only these parts when disassembled from the motor.
For multimounting motors (with removable feet/base), the eyebolts must be
positioned according to the motor mounting position so that the lifting angle
is vertically aligned (lifting at 0°). Additional information regarding the
maximum allowable angle-of-inclination is indicated in the general manual
available on the website www.weg.net.
Periodically and mainly before the initial star-up, measure the insulation resistance of
the motor winding. Check the recommended values and the measuring procedures
on the website www.weg.net.
3. Installation
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.
WIN motor, even de-energized, have a risk of electric shock at their terminals
if the rotor moves. Make sure the rotor is locked before carrying out
operations on the terminals.
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).
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.
The motor must always be positioned so the drain hole is at the lowest
position. The drain plug should be verified periodically to ensure that it
is not clogged or obstructed ensuring the drainage of condensated water.
1
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.
M12 M14 M16 M20
For flying leads motors, do not push the overlength of leads into the motor
15.5 to in order to prevent that they touch the rotor.
- 30 to 50 50 to 75
30
Ensure the correct operation of the accessories (brake, encoder, thermal protection,
115 to
forced ventilation, etc.) installed on the motor before it is started.
- -
170
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 the power supply and investigate the cause of the
thermal protector triping. Magnet motors must be driven by variable frequency
drives only. Motors of frame sizes IEC 315, NEMA 445/7 and above, when
inverter fed, must be equipped with shaft grounding kits.
For more information about the use of variable frequency drives, follow the
instructions in the motor manual 50033244 on the website www.weg.net and in the
manual of the variable frequency drive.
4. Operation
During operation, do not touch the non-insulated energized parts and
never touch or stay too close to rotating parts. Ensure that the space
heater is always OFF during the motor operation.
The rated performance values and the operating conditions are specified on the
motor nameplate. The voltage and frequency variations of the power supply should
never exceed the limits established in the applicable standards.
Occasional different behavior during the normal operation (actuation of thermal
protections, noise level, vibration level, temperature and current increase) must
always be assessed by qualified personnel. In case of doubt, turn off the motor
immediately and contact the nearest WEG service center.
Do not use roller bearings for direct coupling. Motors fitted with roller bearings
require radial load to ensure their proper operation.
For motors fitted with oil lubrication or oil mist systems, the cooling system must be
ON even after the machine is OFF and until the machine is at complete standstill.
After complete standstill, the cooling and lubrication systems (if any exist) must be
switched OFF and the space heaters must be switched ON.
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