Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2020.10
Installation instructions
Fig. 78: Adjustable vibration damper
Vibration dampers can be adjusted in height by means of a screw, pos.1, Fig. 78, which is finally
locked by a tightening nut, pos. 2.
Fig. 79: Diagram for damping of vibrations
As each part of the unit has its own weight, the whole unit does not rest with the same weight on
all supports.
Consequently, vibration dampers with different bearing capacities will be used on a unit and these
must be placed correctly in accordance with the Mounting instruction supplied by Johnson Con-
trols Denmark for each particular unit.
On delivery of a unit from Johnson Controls Denmark, the vibration dampers have not been
mounted. They are included in the delivery and marked with a code.
Similar codes are written in the drawing indicating the position of the vibration dampers. This
drawing will be forwarded for each specific order and must be used for that particular order only.
It is very important that the vibration dampers are fitted correctly as shown in the drawing as the
load on the foot plates varies. Fig. 80 illustrates the different types of vibration dampers for sta-
tionary and marine units.
To check that the vibration dampers are adjusted for the correct load, make a note of the meas-
urement, H or h, in the unloaded state for each individual damper. After loading of the vibration
1
2
1
2
H
h
h’
H’
Not adjustedAdjusted
Damping
500
700
100 0
14 00
200 0
250 0
300 0
30201612108654321. 61. 2
1
0. 80. 6mm
Natural
frequency
0%
50 %
70 %
80 %
85 %
90 %
95 %
97 %
98 %
Deflection of vibration dampers
Vibration speed rpm
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