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Installation, operation and maintenance instructions
High voltage flameproof motors for explosive atmosphere
AMD Rg 355-400-450-500
Rolling bearings maintenance and checking
Issued by: MOLM
Sheet No.
3AAM101040 E
Rev. B
01.2023
Page 9 of 11
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en.
Table 12 A. Lubrication frequency, in hours, for operation at 60 Hz and vertical assembly, for AMD motors with
ribs cooling circuit, IIB/IIC, welded frame.
Size
N° of Poles
Grease (g)
2
4
6
8
10
12
2 poles
4-n poles
450...R…M
1300
2000
4000
5500
6500
7500
45
70
500...R…M
/
1800
3500
5000
6500
7500
/
80
Table 13. Lubrication frequency, in hours, for operation at 50 Hz and vertical assembly, for AMD motors with
tubes cooling circuit, IIB/IIC, welded frame.
Size
N° of Poles
Grease (g)
2
4
6
8
10
12
2 poles
4-n poles
500..T
/
4000
6000
7500
8500
8800
/
70
560..T
/
3500
5500
7000
8000
8800
/
80
630..T
/
3000
5000
6500
7500
8500
/
90
710..T
/
2000
4000
5500
7000
8000
/
55 x 2
900..T
/
/
2400
3600
4600
5400
/
/
14
16
18
6-n poles
900..T
6000
6500
6800
2x130
Table 13 A. Lubrication frequency, in hours, for operation at 60 Hz and vertical assembly, for AMD motors with
tubes cooling circuit, IIB/IIC, welded frame.
Size
N° of Poles
Grease (g)
2
4
6
8
10
12
2 poles
4-n poles
500..T
/
3000
5000
6500
7500
8500
/
70
560..T
/
2500
4500
6000
7000
8000
/
80
630..T
/
2000
4000
5500
6500
7500
/
90
710..T
/
1500
3000
4500
6000
7000
/
55 x 2
900..T
/
/
1800
2800
3800
4600
/
/
14
16
18
6-n poles
900..T
5300
5800
6200
2x130
The calculation has been made considering an environment temperature of 40°C; if the estimated temperature is
different. The values given are to be changed as a consequence; the lubrication frequency is to be halved every
15K over the reference value.
The lubrication intervals are not to be longer than once a year.
Because of the short distance between the fixed and rotating parts of the flame extinguisher, for explosion-proof
motors the maximum load that can be supported by the bearing is lower than for normal motors; this is why the
lubrication intervals are not reduced.
NOTE!
The lubrication intervals indicated in the table are only indicative. For the correct values of the specific
application, always refer to the values indicated on the plate on board the machine.
The tables are also included on the life
L
10h.
This is calculated at 50 Hz as per ISO R 281-1.