Oil Mist Lubricated Bearings; Sleeve Bearing; Insulation Resistance; Insulation Resistance Measurement - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

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5.3.3 Oil Mist lubricated bearings

The motor must be stored in horizontal position. Lubricate the bearings with ISO VG 68 mineral oil in the
amount indicated in the Table 5.2 (this is also valid for bearings with equivalent dimensions). After filling with oil,
rotate the shaft by hand, at least five revolutions)
During the storage period, remove the shaft locking device (if any) and rotate the shaft by hand every week, at
least five revolutions, stopping it at a different position from the original one. Reinstall the shaft locking device
every time the motor has to be moved. If the motor is stored for a period of over two years, the bearings must
be replaced or removed, washed according to manufacturer instructions, checked and relubricated according
to item 8.2.
Bearing Size
6201
6202
6203
6204
6205
6206
6207
6208
6209
6211
6212
6307
6308
The oil must always be removed when the motor has to be handled. If the oil mist system is not operating after
installation, fill the bearings with oil to prevent bearing rusting. During the storage period, rotate the shaft by
hand, at least five revolutions, stopping it at a different position from the original one. Before starting the motor,
all bearing protection oil must be drained from the bearing and the oil mist system must be switched ON.

5.3.4 Sleeve Bearing

The motor must be stored in its original operating position and with oil in the bearings. Correct oil level must be
ensured. It should be in the middle of the sight glass. During the storage period, remove the shaft locking
device and rotate the shaft by hand every month, at least five revolutions (and at 30 rpm), thus achieving an
even oil distribution inside the bearing and maintaining the bearing in good operating conditions. Reinstall the
shaft locking device every time the motor has to be moved.
If the motor is stored for a period of over six months, the bearings must be relubricated according to the Item
8.2 before starting the operation.
If the motor is stored for a period longer than the oil change interval, or if it is not possible to rotate the motor
shaft by hand, the oil must be drained and a corrosion protection and dehumidifiers must be applied.

5.4. INSULATION RESISTANCE

We recommend measuring the winding insulation resistance at regular intervals to follow-up and evaluate its
electrical operating conditions. If any reduction in the insulation resistance values are recorded, the storage
conditions should be evaluated and corrected, where necessary.

5.4.1. Insulation resistance measurement

We recommend measuring the winding insulation resistance at regular intervals to follow-up and evaluate its
electrical operating conditions. If any reduction in the insulation resistance values are recorded, the storage
conditions should be evaluated and corrected, where necessary.
The insulation resistance must be measured in a safe environment.
86 Manual of Electric Motors
Table 5.2 – Amount of oil per bearing
Amount of Oil (ml)
15
15
15
25
25
35
35
40
40
45
50
45
55
Bearing Size Amount of Oil (ml)
6309
6311
6312
6314
6315
6316
6317
6319
6320
6322
6324
6326
6328
65
90
105
150
200
250
300
350
400
550
600
650
700