Weir Warman 650 M200-MCR-G, Руководство пользователя, Страница: 115 / 287

TOROMOCHO PROJECT - WEG MOTORS
TAG´s :
210-PP-001-M 210-PP-003-M 210-PP-101-M
210-PP-002-M 210-PP-004-M
1 - INTRODUCTION
This manual covers all WEG asynchronous induction squirrel cage motors, that is, three phase motors in frames 63 to
355, and single phase motors. The motors mentioned in this manual are subject to continuous improvement. Therefore,
any information is subject to change without prior notice. For further details, please contact WEG.
2 - BASIC INSTRUCTIONS
2.1 - GENERAL INSTRUCTIONS
All personnel involved with electrical equipment, either installation, operation or maintenance should be well-informed
and updated concerning the safety norms and principles that govern the work and, furthermore, they are advised to
heed them. Before work commences, it is the responsibility of the person in charge to ascertain that these have been
duly complied with and to alert his personnel of the inherent hazards of the job in hand. It is recommended that these
tasks be undertaken by qualified personnel. Fire fighting equipment, and notices concerning first aid should not be
lacking at the work site; these should be visible and accessible at all times.
2.2 - DELIVERY
Prior to shipment, motors are factory-tested and dynamically balanced. With half key to ensure perfect operation.
Upon receipt, we recommend careful handling and a physical checking for any damage which may have occured during
transportation. In the event of any damage, both the nearest WEG sales office and the carrier should be informed
immediately.
2.3 - STORAGE
Motors should be lifted by their eyebolts and never by the shaft. Raising and lowering must be steady and joltless,
otherwise bearings may be damaged. When motors are not immediately installed, they should be stored in their normal
upright position in a dry even temperature place, free of dust, gases and corrosive smoke. Other objects should not be
placed on or against them. Motors stored over long periods are subject to loss of insulation resistance and oxidation of
bearings. Bearings and the lubricant deserve special attention during long periods of storage. Depending on the length
and conditions of storage it may be necessary to regrease or change rusted bearings. The weight of the rotor in an
inactive motor tends to expel grease from the bearing surfaces thereby removing the protective film that impedes metal-
to-metal contact. As a preventive measure against the formation of corrosion by contact, motors should not be stored
near machines which cause vibrations, and their shaft should be rotated manually at least once a month.
Recommendations for Storage of Bearings:
- Ambient must be dry with relative humidity not exceeding 60%.
- Clean room with temperature ranging from 10ºC to 30ºC.
- Maximum stacking of 5 boxes.
- Far from chemical products and tubes conducting steams, water and compressed air.
- They should not be stacked over stone floors or against walls.
- Stock should follow the first-in-first-out principle.
- Double shielded bearings should not remain in stock for more than 2 years.
Storage of motors:
- Mounted motors which are kept in stock must have their shaft turned periodically, at least once a month, in order to
renew the grease on the bearing races.
It is difficult to prescribe rules for the actual insulation resistance value of a machine as the resistance varies according
to the type, size and rated voltage and the state of the insulation material used, method of construction and the
machine’s insulation antecedents. A lot of experience is necessary to decide when a machine is ready or not to be put
into service. Periodical records are useful to take such decision. The following guidelines show the approximate values
that can be expected of a clean and dry machine when, at 40ºC, test voltage is applied over a period of one minute.
Insulation resistance Rm is obtained by the formula:
Rm = Un + 1
where: Rm - minimum recommended insulation resistance in M
ℵ
with winding at 40ºC.
Un - machine rated voltage in kV.
In case that the test is carried out at a temperature other that 40ºC, the reading must be corrected to 40ºC using a curve
of insulation resistance vs. temperature for the particular machine. If such curve is not available, an approximation is
possible with the aid of Figure
2.1; it is possible to verify that resistance practically doubles every 10ºC that insulating temperature is lowered.
On new machines, lower values are often attained due to solvents present in the insulating varnishes that later
evaporate during normal operation. This does not necessarily mean that the machine is not operational, since insulating
resistance will increase after a period of service. On motors which have been in service for a period of time, much
larger values are often attained. A comparison of the values recorded in previous tests on the same machine, under
similar load, temperature and humidity conditions, serves as a better indication of insulation condition than that of the
value coming from a single test. Any substantial or sudden reduction is suspect. Insulation resistance is usually