Centre Of Gravity Position; Recommended Tightening Torques For Mounting Screws - Helios B AVD Série Notice De Montage Et D'utilisation

Installation and Operating Instructions
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ATTENTION
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ATTENTION
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ATTENTION
Smoke Exhaust Fans F300/F400/F600 – B AVD and B VAR
3 .9 Maximum permissible vibration limits according to ISO 14694 / ISO 10816-3
– Vibration monitor
When using vibration monitors, these must not deactivate the smoke exhaust fan in a smoke extraction
situation!
Commissioning
Permanent inst. Flexible install.
[mm/s] [mm/s]
4 .5
– Installation of a vibration monitor
The vibration monitor (on-site) must be installed on the casing of the fan and it must not lie in the turning range zone
of the impeller.
The air gap (see Fig .16) must not be affected by the installation of the vibration monitor!
– Selection of vibration dampers
In order to optimally dampen the vibrations created by the rotating components in the fan, the correct selection of
the vibration damper is crucial. The design is based on the determined total mass of the fan incl. mounting parts to
be dampened. In this respect, the individual net weights of the components must be added together.
Example:
B VAR 900/4 37 kW F300 as Z unit
1) Determination of the mass to be dampened
B VAR 900/4 533 kg
B VAR 900/4 533 kg
MP-Z 900 68 kg
VR 900 34 kg
MK 900 18 kg
Total weight 1186 kg

3 .10 Centre of gravity position

A motor protrusion arises depending on the size and motor power and thus an unbalanced centre of gravity outside of
the casing. An extension duct (Type VR..) must be used (Fig.17). to determine the centre of gravity. The weight infor-
mation for the respective types can be found on the type plate!
CORRECT!
3 .11 Recommended tightening torque for mounting screws
The following tightening torques for connection of mounting nuts and screws (grade 8.8) are to be used:
The impeller mounting on the motor shaft is secured against loosening at the factory with liquid screw securer .
DIN933/931 8 .8 galvanised
F300 – F400
Mounting
impeller / motor using
central screw
M6
M8
M10
M12
M16 210
M20 410
Max. permissible vibration limits for fan power < 75 kW
Alarm
Permanent inst.
[mm/s]
6 .3 7 .1
(centre of gravity)
Tightening torque in NM
Strength class
DIN933/931 8 .8 V2A
Mounting
impeller / motor using
central screw
10
25
49
85
12
Deactivation
Flexible install. Permanent inst.
[mm/s] [mm/s]
11 .8 9 .0
INCORRECT!
(centre of gravity)
Verbus Ripp cl . 100
F600 F300 F400 F600
WEG motor / flange plate
6 .2
16
30
50
101
184
Flexible install.
[mm/s]
12 .5
Fig .17
Mounting
9
20
40
70
170
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