Assembling And Disassembling - WEG BFGC 250-315 Instructions De Service

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7.4 The maintenance of flameproof motors is particularly important, as:
• Any changing to the bearings could:
- cause a sudden temperature rise, thus presenting a risk of explosion
- increase the clearance between the shaft and the bearing plate, due to friction of
the shaft on the closing plate; an internal ignition may spread to the outside and
can cause an explosion
• Concerning external ventilation, a fault in the cooling system raises the surface tempera
ture, which could reach values higher than those established for the temperature class.
• The temperature class should be checked on the certification plate; this indicates the
maximum temperature as follows:
8.

ASSEMBLING AND DISASSEMBLING

This type of motors requires a special care. Particularly when assembling and disassem-
bling parts are carried out, the condition of the joints should be checked. The dimensions
of the joints, i.e. length and clearance, have been 100% controlled during production of the
motors. The joints must not be changed and you need to:
- Ensure that the joints are not damaged and do not have cuts or dents.
If this happens the parts should be replaced.
- All the screws should be well tightened. A screw which is not tight enough changes the
resistance of the enclosure. In case of replacement of a screw, it is imperative to keep
its length and quality of material.
- Do not change interchangeable parts during maintenance.
The motor housing must be fitted with screws of resistance class not less than
9. MARKING
9.1 All motors have two marking plates:
- Nameplate
This nameplate contains information in compliance with the IEC 60034-1, as well as other
useful technical information.
Note – The two first digits of the serial number indicate the manufacturing year of the motor.
T3 / 200ºC; T4 / 135ºC; T5 / 100ºC; T6 / 85ºC
8.8.
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