Vibrations; Tightening Torques For Bolt Connections - HLU HF R 48 R Series Operating Manual

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8.5 Vibrations

International standards for the balancing quality and vibration values for industrial fans are defi-
ned in the standard ISO 14694:2003. The vibrations are measured radially on the shaft bearing
of the drive motor. If a measurement is not possible directly on the motor, it is measured radially
at the next point that has a mechanical connection to the motor. The following table shows the
fan application categories for maximum permissible vibration.
Stan-
dard Motor
group power
ISO [kW]
14694
BV-2 >0.15<3.7
BV-3 >=3.7<37
BV-4 >=37<300

8.6 Tightening torques for bolt connections

On the basis of VDI 2230 the following tightening torques are recommended for bolts of strength
class 8.8:
Nominal
diameter [mm]
M4
M5
M6
M8
M10
06.2019
Operating manual
Centrifugal fans
HF R | RV | MRV
Vibration values according to ISO 14694
At manufacturer
Average values;
Min.
maximum values
balan-
in brackets
cing
Fixed Flexibly
quality
mounted mounted
[mm/s] [mm/s]
G16 3.5 (5.1) 5.6 (7.6)
G6.3 2.8 (3.8) 3.5 (5.1)
G2.5 1.8 (2.5) 2.8 (3.8)
Tightening
torques [Nm]
3,3
6,5
11,3
27,3
54
Limit values
In operation
Average values;
maximum values
in brackets
Fixed mounted
[mm/s]
Start-up 5.6 (7.6)
Alarm 9.0 (12.2)
Slow-down 10 (14)
Start-up 4.5 (6.4)
Alarm 7.1 (10.2)
Slow-down 9.0 (12.7)
Start-up 2.8 (4.1)
Alarm 4.5 (6.4)
Slow-down 7.1 (10.2)
Nominal Tightening
diameter [mm] torques [Nm]
M12
M16
M20
M24
Flexibly mounted
[mm/s]
Start-up 9.0 (12.7)
Alarm 14.0 (19.1)
Slow-down 16 (21)
Start-up 6.3 (8.8)
Alarm 11.8 (16.5)
Slow-down 12.5 (17.8)
Start-up 4.5 (6.4)
Alarm 7.1 (10.2)
Slow-down 11.2 (15.2)
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