Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Installation instructions
7.29 Alignment procedure for coupling
The coupling is aligned as described in the following. The alignment accuracy of the coupling is in-
dicated in Table 30.
In principle, alignment is about moving the motor so that its shaft is placed in continuation of the
compressor shaft.
Fig. 78: Alignment procedure
Coupling
Horizontally
(mm)
Vertically (mm)
Roller+Slide
bearing motor
Roller+Roller or
Slide+Slide
bearing motor
Pos. 2
(mm)
Series 52 size 375
Series 52 size 450
0-0.10
0.05-0.15
above shaft with
slide bearings
0-0.10 0-0.10
Other couplings
0-0.10
0.05-0.15
above shaft with
slide bearings
0-0.10
0-
Table 30: Dimensional tolerance and torque
Parallel shafts on a horizontal level
1. Turn the coupling so that the alignment tool is in top position.
2. Guide measuring pin, pos. 2, Fig. 78, towards the coupling flange with a 1 mm feeler
gauge in between and secure the pin. Remove the feeler gauge.
3. Turn the coupling 180°. Motor and compressor are turned at the same time. Measure with
feeler gauge how much the distance from the measuring pin (s) to coupling part has
changed. The change is called X.
For a motor with sleeve bearings, the difference in the distance from the two measuring
pins to the flange must be calculated and then divided by 2 to obtain X. This is to compen-
sate for any axial movement of the motor rotor when turning the motor.
4. Measure the distance b between the feet of the motor as shown in Fig. 80. Measure the
distance a from the middle of pin 2 to the centre line of the motor as shown in Fig. 78.
5. Insert liners with thickness Y either under both front feet or both rear feet, tilting the mo-
tor at the desired end. Use the following formula for calculation of the liner thickness:
Motor shaft
Compressor
shaft
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