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Recommended values for synchronizing are:
•
U
=2 %.
•
f
=0.7 %.
•
phase angle<15º.
Maximum values
U
=4.5 % and
f
=4.0 % should not be exceeded.
NOTE: Operation of the machine at reduced speed under 75 % of rated speed
should be avoided.
5.7 Running the machine the first time
5.7.1 Bearings with re-lubrication option
In case of a newly installed machine, or a machine which has been out of service
for more than 2 months, inject new grease into the bearings immediately after
start-up. New grease must be injected when the machine is running, and is
injected until old grease or excess new grease is discharged through the
lubrication channel in the bottom of the bearing housing, see
Figure 5-1. Example
of lubrication channel through bearing arrangement of horizontal machine.
Figure 5-1. Example of lubrication channel through bearing arrangement of
horizontal machine.
NOTE: The re-lubrication interval will never be longer than 12 months.
The type of original grease used is found on the bearing plate on the
machine. Acceptable types of grease can be found in
Chapter 7.5.5. Bearing grease
.
The temperature of the bearings will initially increase because of the excess
grease. After few hours, the excess grease will be discharged through the
lubrication valve and the temperature of the bearing will return to normal running
temperature.
