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The machine mountings affect the resonances related to the basic running speed of the
machine. Machines with rubber or spring mountings often vibrate at low speeds following
start-up, and as the speed increases the vibration level is reduced. Such a machine is
considered to be flexible mounted.
Modern high speed machines having flexible bearing supports can also be considered as
flexible mounted even though not mounted on rubber or springs.
A great advantage of using proper vibration measurements and standards is that future
maintenance requirements and costs can be assessed reliably on machine commissioning.
For example, if levels of 3mm/s rms are measured for a new machine, it is likely to require
high maintenance activity. The specific requirement of this is dependant on the machine
design and the advice of the machine manufacturer should be sought.
QM014 Issue 5
Industrial machines with power above 15kW and
nominal speeds between 120-15000 r/min
Unit
Group 1 and 3
mm/s
Rigid
0-1.4
1.4-2.3
2.3-2.8
2.8-3.5
3.5-4.5
4.5-7.1
7.1-11
11-
Figure 2. ISO 10816-3 Vibration Levels
Group 2 and 4
Flexible
Rigid
- 9 -
HS-620/630 User Guide
Flexible
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