Vibration And Noise - ABB AMA Manual

Manual for High Voltage Process Performance Motors

7.4.2 Vibration and noise

52 - Maintenance
Table 7-2. General tightening torques
Tightening torque in Nm (pound-feet)
Property class 8.8 for bolts
Size Oiled [Nm]
M 4
M 5
M 6
M 8
M 10
M 12
M 14
M 16
M 20
M 24
M 27
M 30
M 36
M 39
M 42
M 48
NOTE: The values in Table 7-2 General tightening torques are general, and do not apply to
various items, such as diodes, support insulators, bearings, cable terminals or pole
fastenings, bus bar terminals, surge arrestors, capacitors, current transformers, rectifier
and thyristor bridges, or if some other value is given elsewhere in this manual.
High or increasing vibration levels indicate changes in the machine's condition. Normal levels
vary greatly depending on the application, type and foundation of the machine. The vibration
measurements and levels are discussed in detail in Chapter 7.4.3 Vibrations. Some typical
reasons that might cause high noise or vibration levels are:
• Alignment, see Chapter 3 Installation and Alignment
• Bearing wear or damage
• Vibration from connected machinery, see Chapter 7.4.3 Vibrations
Oiled [pound
feet]
2.7 2.0
5.0 3.7
9 6.6
22 12
44 32
75 55
120 88
180 130
360 270
610 450
900 660
1200 890
2100 1500
2800 2100
3400 2500
5200 3800
Dry [Nm] Dry [pound
feet]
3.0 2.2
5.5 4.1
9.5 7.0
24
46
80
130
200 150
390 290
660 490
980 720
1300 960
2300 1700
3000 2200
3600 2700
5600 4100
3BFP 000 063 R0101 REV D
18
34
59
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