12 SKF Machine Condition Advisor
User Manual
How to Choose the Correct “Alarm
Velocity Group” for your Machinery
The Alarm Velocity Group you specify (G2&4 or
G1&3) determines the instrument’s “overall vibration”
alarm limits. Therefore, you should select the Group
that best describes the general size, type, and speed
of the machinery you’re measuring. Note that these
machine group classifications adhere to ISO standard
10816-3, which rates overall velocity vibration levels
for standardized machinery classifications. Options
are:
Groups 2&4 (default)
The ISO standard Group 2 and 4 classifications define
the following type of machinery:
• Medium size machines and electrical machines
with a shaft height between 160 mm and 315
mm.
• These machines are normally equipped with
rolling element bearings, but may use sleeve
bearings, and operate at speeds above 600
RPM.
• These machines include pumps with multi-vane
impellers and integrated drivers.
Groups 1&3
The ISO standard Group 1 and 3 classifications define
the following type of machinery:
• Large machinery and electrical machines with a
shaft height greater than 315 mm.
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