Recommended Maintenance Program - ABB AMA Series Manual

7.3.1 Recommended maintenance program

3BFP 000 050 R0101 REV E
The Level 3 maintenance should be performed after every 24 000 equivalent operating hours or
at a three to five year interval. When L3 maintenance is conducted it replaces the L1 or L2
maintenance otherwise scheduled, and it leaves their rotation unaffected, see Table 7-1
Maintenance intervals.
Level 4 (L4)
Level 4 or L4 maintenance consists of performing extensive inspections and maintenance tasks.
The purpose of this maintenance is to restore the machine into a reliable operating condition.
The maintenance can be estimated to last approximately 40 - 80 hours, depending mostly on the
condition of the machine and the needed reconditioning actions. Tools for this maintenance
include the same tools as for L3, and in addition, the rotor removal equipment. The preparations
consist of opening the inspection covers, bearings and water cooler, if applicable, and the
removal of rotor.
The amount of spare parts required for this level of maintenance needs to be determined before
the maintenance. At least the Recommended spare part is needed. Spare parts included in the
capital spare part package would ensure a fast and successful execution of this maintenance.
The Level 4 maintenance should be performed after every 80 000 equivalent operating hour.
When a L4 maintenance is conducted it replaces the L1, L2 or L3 maintenance otherwise
scheduled, and it leaves their rotation unaffected, see Table 7-1 Maintenance intervals.
Abbreviation used in maintenance program:
• V = Visual checking
• C = Cleaning
• D = Disassembling and assembling
• R = Reconditioning or replacement
• T = Testing and measurement.
Not all options are applicable for all machines.
Manual for Induction Motors and Generators
Maintenance - 59