Maintance; Bearing Lifetime - Siemens 1LG0 Installation And Maintenance Manual

4.0 MAINTAINCE
Safety precautions!
Note:
If the motor is equipped with an anti condensation drain plug(s), service
is required at regular intervals. This interval is determined by operating
environments such as temperature and humidity levels as well as mounting and
operation cycles. See section 4.6 for drain plug location.

4.1 Bearing lifetime

The average bearing lifetime for motors with sealed or open bearing at the DE & NDE
varies between 20,000 and 40,000 hours for horizontal mounted motors without
additional axial loading. This 20,000 or 40,000 hours of operation applies to 2, 4, 6
pole motors when operated at an ambient 40ºC based on rating plate data. For every
10K temperature rise above 40ºC, the grease lifetime is reduced by one half.
Note:
Extended storage periods, excessive vibrations and high humidity levels will
reduce the useful life of the DE & NDE bearing and bearing grease. For sealed or
regreasbale bearing, it is recommended that permanently lubricated bearings
should be replaced after 24 months of storage. If the motor is equipped with
regreasable DE & NDE bearing, the grease must be replaced as per the published
time intervals in section 4.2.
Operating a motor above synchronous speeds for extended periods of time
Warning! Warning!
will reduce the bearing grease lifetime.
12
Before starting any service and maintenance work on
the motor the motor must be properly isolated from the
mains and auxiliary power.
The usual "5 safety rules" (as set forth in DIN VDE 0105) are:
• Isolate the equipment
• Take effective measures to prevent reconnection
• Verify equipment is dead
• Earthing and short-circuit
• Cover or fence off adjacent live parts
These precautions listed above should remain in force
until all maintenance work is finished and the motor
has been fully assembled.