Engineering manual - SAB 355 Screw compressor unit (including ATEX)
004100 en 2020.10
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Installation instructions
Fig. 79: Formula for calculation
Fig. 80: Distance between the motor feet
After having tightened the motor bolts, repeat the measuring and compare the result with the ta-
ble values.
Parallel displacement to correct centre height
1. Turn the coupling so that the alignment gauge faces downwards.
2. Guide the measuring pin pos. 1, Fig. 78, towards the coupling part with a 1 mm feeler
gauge in between. Secure the pin and remove the feeler gauge.
3. Turn the coupling 180° and measure with feeler gauge how much the distance has in-
creased. The increase is called Z.
4. Then lift the motor by placing liners with half the thickness, i.e. Z/2, under all four feet.
5. After securing the motor, repeat the measuring and compare the result with the table
values.
Parallel shafts on a vertical level
1. Turn the coupling so that the alignment gauge faces horizontally to one side.
2. Move both measuring pins towards the coupling with a 1 mm feeler gauge in between.
Lock the pins and remove the feeler gauges.
3. Turn the coupling as close to 180° as allowed by the cap cover and measure with feeler
gauge the deviations from the original one millimetre on both pins.
Working on a motor with sleeve bearings, the measure for angular deviation is obtained
with the use of two sets of alignment tools as described in Parallel shafts on a horizontal
level.
4. Moving and turning the motor sideways with the adjustment screws and repeating the
measuring, align the motor in accordance with the table.
Remember that the motor must be secured during each measuring.
Final installation
1. Tighten the fixing bolts on the motor.
2. Dismantle the alignment tool.
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