Bearing Maintenance; Maintenance Of Stator And Rotor Windings - ABB AMA Manual

7.5.1.6 Bearing maintenance

7.6 Maintenance of stator and rotor windings

3BFP 000 063 R0101 REV D
• Total Multiplex S 2 A
• Fag Arcanol Temp 110
Re-greasing intervals for greases fulfilling the required properties other than the ones mentioned
above should be halved.
Rolling bearing grease for extreme temperatures
If the bearing operating temperature is above 100°C (210°F), please consult the manufacturing
ABB factory for suitable greases.
The lifetime of the bearings is likely to be shorter than the lifetime of the electrical machine.
Therefore, the bearings will have to be changed periodically.
The maintenance of rolling bearings requires special care, tools and arrangements as to ensure a
long lifetime of newly fitted bearings.
During bearing maintenance, ensure that:
• No dirt or foreign debris is allowed to enter the bearings at any time during the
maintenance
• The bearings are washed, dried and pre-greased with suitable and high quality rolling
bearing grease before assembly
• The disassembly and mounting of the bearings does not damage the bearings. The bearings
must be removed by using pullers and fitted by heating, or using special tools for the
purpose.
If there is a need to change bearings, please contact ABB After Sales. See After Sales contact
information in Chapter 9.1.5 After Sales contact information.
The windings of rotating electrical machines are subjected to electrical, mechanical and thermal
stresses. The windings and insulation gradually age and deteriorate due to these stresses.
Therefore, the service life of the machine often depends on the insulation durability.
Many processes leading to damages can be prevented or at least slowed down with appropriate
maintenance and regular testing. This chapter offers a general description on how to perform
basic maintenance and tests.
In many countries, ABB Service offers complete service maintenance packages, which include
comprehensive testing.
Before conducting any maintenance work on the electrical windings, general electrical safety
precautions are to be taken and local regulations are to be respected in order to prevent
personnel accidents. See Chapter 7.2 Safety precautions for more information.
Independent test and maintenance instructions can also be found in the following international
standards:
1. IEEE Std. 43-2000, IEEE Recommended Practice for Testing Insulation Resistance of
Rotating Machines
Manual for High Voltage Process Performance Motors
Maintenance - 59