Motor Assembly And Disassembly - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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Frame
IEC NEMA
315L/A/B and 5006/7/8T and
315C/D/E 5009/10/11T
355L/A/B and 5807/8/9T and
355C/D/E 5810/11/12T
400L/A/B and 6806/7/8 and
400C/D/E 6809/10/11T
450 7006/10
315L/A/B and 5006/7/8T and
315C/D/E 5009/10/11T
355L/A/B and 5807/8/9T and
355C/D/E 5810/11/12T
400L/A/B and 6806/7/8 and
400C/D/E 6809/10/11T
450 7006/10
500 8006/10
The lubricating oil must be replaced as specified on the nameplate or whenever changes on the oil properties
are noticed. The oil viscosity and pH must be checked periodically. The oil level must be checked every day
and kept in the center of the sight glass.
Please contact WEG, when oils with different viscosities are to be used.

8.3. MOTOR ASSEMBLY AND DISASSEMBLY

All repair services on motors for use in hazardous areas should be always performed by qualified
personnel and in accordance with the applicable laws and regulations in each country. Always use
proper tools and devices for motor disassembly and assembly.
Disassembly and assembly services can be carried out only after the motor has been disconnected
from the power supply and is completely stopped.
Dangerous voltages may be present at the motor terminals inside the terminal box since capacitors can
retain electrical charge for long periods of time even when they are not connected directly to a power source or
when space heaters are connected to the motor or when the motor windings are used as space heaters.
Dangerous voltages may be present at the motor terminals when they are driven by frequency inverter even
when they are completely stopped.
For explosion-proof motors and protection by enclosure motors, open the terminal box and/or
disassemble the motor only after the enclosure surface temperature has cooled down up to ambient
temperature.
Record the installation conditions such as terminal connection diagram, alignment / leveling conditions before
starting the disassembly procedures. These records should be considered for later assembly.
Disassemble the motor carefully without causing scratches on machined surfaces or damaging the threads.
Assemble the motor on a flat surface ensuring a good support base. Footless motors must be fixed/locked on
the base to prevent accidents.
Handle the motor carefully to not damage the insulated components such as windings, insulated rolling
bearings, power cables etc.
Seal elements, such as joint seals and bearing seals should always be replaced when wear or damage is
noticed.
Motors with degree of protection higher than IP55, the machined joints are protected at factory by a suitable
rust inhibitor. Thus all machined surfaces (for example, covers of the terminal boxes of explosion-proof motors)
must be carefully cleaned before assembly and provided again by a thin coat of rust inhibitor as shown in
Figure 8.2.
116 Manual of Electric Motors
Table 8.6 – Oil properties for sleeve bearings.
Bearing
Poles
designation
2 9-80
9-90
9-100
4 - 8
11-110
11-125
Oil
Interval (h)
(liters)
2.8 8000
2.8
8000 Renolin DTA 15
4.7
Lubricant
Lubricant
Specification
ISO VG32
mineral oil with
Renolin
antifoam and
DTA 10
antioxidant
additives
ISO VG46
mineral oil with
antifoam and
antioxidant
additives