Technical data are subject to change without notice.
© Copyright SPM 2002-04. 71650.B
SPM Instrument AB • Box 504 • S-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.se
General remarks on system planning
Condition based maintenance puts a heavy responsibility on the measuring personnel – they have
to find machine faults before these cause trouble, and they should be able to present a detailed
fault analysis which allows fast repairs.
In the vast majority of cases, bearing condition monitoring is a simple, fast and easy job. There are
only two basic requirements for obtaining a reliable condition reading:
• a correct measuring point, selected according to SPM's rules.
• a correct initial value dBi, calculated from shaft diameter and rpm.
As with any condition evaluation method, there are borderline cases and exceptions from the
norm. In a few cases, SPM measurements can be more difficult because of low rpm and low or
irregular load, interference from other shock pulse sources, or very rapid damage development.
This manual emphasises the exceptional cases, where extra care is needed to avoid a misinterpre-
tation of the measuring results. It also stresses the fact that careful planning and efficient measur-
ing routines are the best means to save time, increase accuracy, and avoid errors. The reason is
obvious: while thousands of successful routine measurements will pass unnoticed, a single
unprevented bearing failure can have very spectacular and costly results.
The recommended administrative routines are based on long experience with the SPM method.
They are flexible in detail, and can be adapted to the existing maintenance system.
Basically, an efficient condition monitoring system requires:
• careful preparation to obtain reliable base data for normal bearing and machine condition.
• well planned routines for periodic data collection.
• a thorough evaluation of any deviation from the normal condition measurements.
When Condmaster
®
Pro is used, all data are stored in the PC, and the alarm list and graphics display
are used to follow up the readings. Use the first carefully evaluated reading(s) to determine alarm
limits.
Setting up an SPM system:
1 Select machine units
2 Establish measuring rounds
3 Define measuring intervals
4 Select measuring points
5 Choose measuring equipment
6 Install measuring equipment
7 Input measuring point and rounds in
Condmaster
®
Pro, or, for manual
measurements, prepare follow-up
forms
8 Evaluate initial readings
Shaft diameter
and rpm
Measuring
point
Load
24 General remarks on SPM measurement
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