ABB AMA Manual page 62

Manual for High Voltage Process Performance Motors
The first Level 1 maintenance should be performed after 4 000 equivalent operating hours or six
months after commissioning. Subsequently the L1 maintenance should be performed yearly
halfway between Level 2 maintenances, see Table 7-1 Maintenance intervals.
Level 2 (L2)
Level 2 or L2 maintenance consists mainly of inspections and tests and small maintenance
tasks. The purpose of this maintenance is to find out whether there are problems in the operation
of the machine and to do small repairs to ensure uninterrupted operation.
The maintenance can be estimated to last approximately 8 - 16 hours, depending on the type and
installation of the machine and the amount of servicing to be done. Tools for this maintenance
include normal servicing tools, multi meter, torque wrench and insulation resistance tester. The
preparations consist of opening the inspection covers and bearings if necessary. Spare parts
suitable for this level of maintenance are included in the Operational spare part package. The
packages are shown in Chapter 9.2.5 Typical recommended spare parts in different sets
The first Level 2 maintenance should be performed after 8 000 equivalent operating hours or
one year after commissioning. Subsequently the L2 maintenance should be performed yearly or
after every 8 000 equivalent operating hours, see Table 7-1 Maintenance intervals.
Level 3 (L3)
Level 3 or L3 maintenance consists of performing extensive inspections, tests and larger
maintenance tasks that have come up during L1 and L2 maintenances. The purpose of this
maintenance is to repair encountered problems and replace parts subjected to wear.
The maintenance can be estimated to last approximately 16 - 40 hours, depending on the type
and installation of the machine and the amount of repairs and replacements to be done. Tools for
this maintenance include the same tools as for L2 and in addition an endoscope and an
oscilloscope. The preparations consist of opening the inspection covers, the bearings and the
water cooler, if applicable. Spare parts suitable for this level of maintenance are included in the
Recommended spare parts package. The packages are shown in Chapter 9.2.5 Typical
recommended spare parts in different sets.
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.
48 - Maintenance 3BFP 000 063 R0101 REV D