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CURRENT RECTIFICATION
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must then be adjusted by hand to make up the difference, whereupon the load thereafter will be automatically equalized between the twro.
Straight Edge
Figure 75
Usually two generators will parallel very nicely if connected through a properly designed equalizer, though they may require an adjustment of the field regulators each time at starting to equalize the load.
(101) In motor generator sets not having both motor and generator mounted on one solid base, it is very important that the alignment of the motor and generator shafts (assuming them to be connected by flanges as shown in Fig. 75 ) be carefully tested. Unless these shafts are in perfect alignment there will be vibration and perhaps noise.
The test should be made before the flanges are bolted together. (102) This may be done by laying a steel straight-edge across the face of the flanges, as shown in Fig. 75. In case the faces of the flanges are not machined flat, then a longer steel straightedge, such as a carpenter's steel square may be laid upon the coupling and aligned with one shaft by caliper measurement and if the alignment is correct the measurement from the other shaft to the opposite end of the straightedge will be the same. This must be done both on top and on the side. Be sure to have the straightedge in perfect alignment with the shaft lengthwise when making the test.
Another though less accurate test is to bolt the flanges tightly together. Then unbolt them and if the flanges surfaces remain in contact all the way around the alignment is correct.