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2.4 Overall Vibration Measurement & Assessment
At switch-on the meter defaults to the Velocity measurement mode, with the units 'mm/s
rms' indicated at the bottom right of the display.
If required, press SEL to select acceleration or displacement. Note that no vibration
assessment is available on these ranges.
When the vibration reading has settled, press VIB to move to the Hold Mode. An 'H' icon
is displayed.
In the velocity range the meter will then indicate either a tick icon for OK, a single bell for
vibration alert or two bells for danger.
The meter makes this assessment depending on the vibration level and one of the four
machine group options selected using the SEL key.
The machine groups are defined in ISO10816-3 and the meter categorises these as
'ISO1&3-R', 'ISO2&4-R', 'ISO2&4-F'. R and F refer to rigid and flexible machine mounting
respectively.
A label on the back of the meter gives detail of the ISO10816-3 machine groups. The
user can refer to this to confirm the appropriate group number for the tested machine.
The information contained is as follows in section 2.5.
2.5 ISO Machine Groups
Group 1 -
Group 2 -
Group 3 -
Group 4 -
Support Class-
QM014 Issue 5
Large machines rated power above 300KW; Electrical Machines
with shaft dia. >315mm. Normally sleeve bearings, speed
120RPM - 15000RPM.
Medium-sized Machines rated power 15KW < P <300KW;
Electrical Machines with shaft 160mm <dia.> 315mm. Normally
element bearings, speed above 600RPM.
Pumps with multi-vane impeller and with separate driver
(centrifugal, mixed flow or axial flow) with rated power above
15KW.
Pumps with multi-vane impeller and with integrated driver
(centrifugal, mixed flow or axial flow) with rated power above
15KW.
R = Rigid Mount. F = Flexible Mount.
- 6 -
HS-620/630 User Guide
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