General Instructions; Safety Instructions; Receiving; Storage - WEG G truck Serie Manual De Instalación, Operación Y Mantenimiento

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2 GENERAL INSTRUCTIONS

2.1 SAFETY INSTRUCTIONS

All personnel working in the assembly, operation or
maintenance of electrical installations must be
permanently informed and updated on the safety
standards and instructions regarding this kind of job and
are advised to strictly comply with them. Before beginning
any job, the person in charge must make sure that all
relevant safety aspects have been duly observed and warn
the respective personnel about the danger inherent to the
task being performed.
When not properly or correctly used, not properly
maintained, or if serviced by unqualified people,
alternators may cause serious injuries and/or material
damages.
Because of this, it is recommended that these services be
carried out by personnel with qualifications means those
who, due to their training, experience, education level,
knowledge of applicable standards, specifications, safety
standards, accident prevention and knowledge of the
operating conditions, have been authorized by the people
in charge to execute all necessary tasks, and who are able
to recognize and avoid any possible danger. Firefighting
equipment and signs containing first aid instructions must
be provided in visible and easily-accessible locations
within the work site.

2.2 RECEIVING

All alternators are tested and are supplied in proper
operating condition. The machined surfaces are protected
against corrosion. The box or container must be checked
right after its receipt in order to verify occasional damages
caused by transportation. Any damage must be reported
immediately to the carrier, the insurer and WEG. Failure to
observe this procedure will void the warranty.
When lifting the package (or container), all the lifting
points, the weight indicated on the package or nameplate,
and capacity of the hoist must be observed.
Alternators packed in wooden crates must always be lifted
by their own eyebolts or by a proper forklift, and must
never be lifted by the wooden parts;
The package can never be overturned. Carefully place it
on the floor (without impact) to avoid damages to the
bearings.
Do not remove the existing protection grease on the shaft
end. This protection must remain in place until the final
assembly. After unpacking, a complete visual inspection
on the alternator must be performed. For alternators with
shaft locking system, it must be removed and stored for
future alternator transport separately. For alternators with
roller bearings, you must manually turn the rotor a few
times. If there is any damage, immediately contact the
carrier and WEG.
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2.3 STORAGE

f the alternator is not immediately unpacked, the box must
be stored in a place protected against humidity, vapors,
sudden temperature variations, rodents and insects.
For the bearings not to be damaged, the alternators must
be stored in places free from vibration.
For alternators that have heating elements, these must be
connected. Any damage to the painting or corrosion
protection of the machined parts must be corrected.
2.3.1

Characteristics of the environment

If the alternator is put into operation after a less storage
than or equal to 6 months, the control is not necessary.
Rotate the rotor monthly (manually) to a new position.
After 6 months of storage and before commissioning, the
rolling bearings must be lubricated.
If the alternator is put into operation after a storage period
near or greater than 2 years, the bearings must be
disassembled, washed with petroleum ether and checked.
After assembly they must be greased. For alternators with
shielded bearings, after a period of two years, bearing
replacement is necessary before operation.
2.3.2

Insulation resistance

When the alternator is not immediately put into operation,
it must be protected against moisture, high temperature
and dirt, thus avoiding damages to the insulation.
The insulation resistance of the winding must be
measured before starting the motor.
If the environment is too humid, it is necessary to check it
periodically during storage.
The following guidelines show the approximate insulation
resistance values that can be expected when using the
Megohmeter in a clean and dry machine at 40 °C, when
the test voltage (1000 V) is applied for 1 minute.
Table 2.1: Insulation resistance referential limits in electric
machines
Resistance value
of the insulation
2 MΩ or lower
< 50 MΩ
50...100 MΩ
100...500 MΩ
500...1000 MΩ
>1000 MΩ
Evaluation of
insulation
Bad
Dangerous
Fair
Good
Very Good
Excellent