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4.4 Coupling
4.4.1 Direct coupling
Slide the half couplings onto the shaft of the blower and of the motor using suitable tools.
Warning: Do not use a hammer to slide on the half couplings.
Secure the half couplings with security dowels which will push on the keys.
Place the blower at the distance S from the motor as indicated in the table below.
Align the shafts of the blower and of the motor by shims under the feet of the motor and/or blower.
Check the alignment by using comparators or gauges with scales as shown in Fig. 6
Coupling diameter
Distance
S
( mm )
Axial
deviation
Ka
( mm )
Standard deviation
Radial
Kr
( mm )
Angular
Kw
( mm )
80
3
1
0.13
0.13
100
3
1
0.15
0.15
130
3
1
0.18
0.18
150
3
1
0.21
0.21
160
4
2
0.27
0.27
180
4
2
0.30
0.30
200
4
2
0.34
0.34
225
4
2
0.38
0.38
250
5.5
2.5
0.42
0.42
280
5.5
2.5
0.47
0.47
315
5.5
2.5
0.52
0.52
350
5.5
2.5
0.58
0.58
Alignment check
Smax < S + Ka
Smin < S – Ka
rpm
Kv = 1.5 -------------
3000
∆
r < Kr x Kv
Dw = Smax – Smin
Dw < Kw
x Kr
∆
r + Dw < Kw x Kv
Fig. 6
Warning : Alignment errors cause premature wearing of the bearings and flexible couplings.
r
S
S Max
S Min
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