Flameproof motors | 55
that PTB and PTB cover cylindrical
joints are centered;
b. Bolt the PTB cover to the PTB with the
8 bolts (the same bolts that originally
fix the PTB cover).
TIGHTENING TORQUE FOR
FLAMEPROOF ENCLOSURES
BOLTS
Table 8-18 – Tightening torques
Stainless steel
Class 70/80
SPARE PARTS
When ordering spare parts, motor type and serial
number must always be given as indicated on the
motor nameplate.
It is not necessary to acquire spare parts for motors
with a continuous duty functioning in the first two
years.
The components have an estimated life span,
nevertheless their durability can vary with their
application. For this reason some parts should be
kept in stock.
WEG recommends keeping in stock the following
spare parts:
- DE and NDE rolling bearings (for motors
equipped with rolling bearings);
- DE and NDE bearings shell (for motors
equipped with sleeve bearings);
- Axial or radial seals;
- Gaskets;
- External fan;
- Thermal protections for windings and/or
bearings;
- Grease nipples;
- Terminal block;
- Connectors;
- Auxiliary terminals;
- Bearings lubricant.
The spare parts must be stored in clean, dry, well
ventilated environments and, if possible, at
constant temperature.
Any intervention on the motor may only be
performed by a specialized WEG certified
technician.
9. MAINTENANCE PLAN
Damaged parts (with cracks, damaged machined
parts and defective threads) must be replaced. It is
recommended not to repair such parts.
All services described herewith should be carried
out by skilled and experienced people so as to
avoid damage to the equipment. In case of doubt,
contact WEG.
EX ATMOSPHERE INFORMATION
For motors to be used in explosive
atmospheres, we do not recommend
to repair damaged or worn parts.
EX ATMOSPHERE INFORMATION
Under no circumstances flameproof
motors can operate in a potentially
explosive atmosphere with a
damaged enclosure and/or any
damaged flameproof joint.
DETAILED INSPECTION:
Inspection which encompasses those aspects
covered by a close inspection and, in addition
identifies those defects, such as loose
terminations, which will only be apparent by
opening the enclosure, and/or using, tools and test
equipments.
CLOSE INSPECTION:
Inspection which encompasses those aspects
covered by a visual inspection and, in addition,
identifies those defects, such as loose bolts, which
will be apparent only by the use of access
equipment, for example steps, (where necessary),
and tools.
VISUAL INSPECTION:
Inspection which identifies, without the use of
access equipment or tools, those defects, such as
missing bolts, which will be apparent to the eye.
For a safe repair, we recommend to buy original
new parts from the factory. So the following plan is
recommended:
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