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Product documentation 1D 3.8.en Rev. E, 10/13 page 25/42
4.2.10 Alignment (slide bearings)
Careful alignment with the machine to be driven is essential for smooth running and trouble-free operation of
the machine set.
The generator is aligned with the already trued-up and securely mounted motor. Written confirmation of the
proper alignment of the motor and correct positioning of the coupling flange (height) must be obtained.
When making the axial alignment, bear in mind that the rotor is guided axially in the D-end bearing (see also
dimension drawing/text). A symmetrical position of the shaft in the bearing shell must be ensured during
alignment. For this purpose, determine the dimension of rotor deflection (Fig. 10) by moving the rotor axially
towards the D end and then the N end until the right and left shaft shoulder respectively make contact with
the bearing shell. The mean deflection is then determined on both sides of the bearing shell.
Fig. 10 Axial alignment of the rotor in D-end bearing
Measure the axial offset between the coupling halves at four points 1, 2, 3 and 4 spaced evenly round the
circumference (for example see Fig. 11). Make a note of this first measurement.
1
st
evaluation 2
st
evaluation
Deviation in vertical plane 0,0375 mm Deviation in horizontal plane 0,0425 mm
Fig. 11 Example of axial measurement, view of measuring points at DE
Repeat and note the measurements after rotating both shafts (together as far as possible) through 90° to the
positions 90°, 180° and 270°.
Measuring point
1 2 3 4
1. Measurement: 95 92 85 100
2. Measurement: 95 92 90 100
3. Measurement: 93 87 85 102
4. Measurement: 100 95 98 98
Mean: 97 91,5 89,5 100
Clutch cover – alignment of generator (motor) with drive machine
Alignment of electric machine with drive machine and covering the clutch must be done this way,
that clutch together with cover never create negative pressure on the front side of the bearing. In the
case you do not keep this condition it can happen oil taking from the bearing, oil leakage and
dripping through bearing seals.
CAUTION
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