Manual for Induction Motors and Generators
58 -
Maintenance
3BFP 000 050 R0101 REV E
***Following paragraph for application type: Variable speed drive
Equivalent operating hours (Eq. h) = Actual operating hours
***Following paragraph for application type: Constant speed drive
Equivalent operating hours (Eq. h) = Actual operating hours + Number of starts x 20
Level 1 (L1)
Level 1 or L1 maintenance consists of visual inspections and light maintenance. The purpose of
this maintenance is to do a quick check whether problems are beginning to develop before they
cause failures and unscheduled maintenance breaks. It gives also suggestions what maintenance
issues must be performed in the next lager overhaul.
The maintenance can be estimated to last approximately 4 - 8 hours, depending on the type and
installation of the machine and the depth of the inspections. Tools for this maintenance include
normal servicing tools i.e. wrenches and screw drives. The preparations consist of opening the
inspection covers. It is recommended that at least the Operational spare part package is available
when commencing this maintenance. The packages are shown in
recommended spare parts in different sets
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
