PRÜFTECHNIK VIB 5.300 EX Series, Operating Instructions Manual

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5-13
VIBXPERT 11.2010
Starting the measurement and displaying the shaft centerline plot
• Click on the measurement task icon and then on 'Start' (see p. 5-
6). During data collection, the values for the DC component are
displayed in the measurement data dialog window (see p. 5-7).
• After measurement, press the F key and click on 'Shaft centerline'.
The shaft centerline plot appears (see below).
Static shaft position
By default, the DC component at the smallest rpm defines the static
shaft position in the shaft centerline plot. The static shaft position can
also be set after measurement using other methods:
• Press the MENU key in the results screen.
• Select 'Shaft centreline' and click on 'Get shaft rest position'.
• Select one of the following methods:
-
C
URRENT
C
URSOR
: Cursor position indicates the rest position.
- E
NTER MANUAL
: Enter the coordinates for every channel.
- M
EASURE
: Use the 'Static shaft position' measurement task.
- C
HOOSE FROM FILE
: Import from a 'Static shaft position' result file.
Sensor arrangement
The arrangement of the sensor relative to the direction of rotation
influences the position and orientation of the shaft displacement in
the diagram. Because the direction of the shaft displacement with
respect to the direction of rotation is a characteristic of certain fault
types in journal bearings, the correct sensor arrangement in the
diagram is important. If necessary, the arrangement of the sensors
and the direction of rotation can be mirrored:
• Press the MENU key.
• Select 'Shaft centreline' and click on 'Fit sensor adjustment'.
• In the next window (sensor geometry, at right), click on 'Flip A-B'.
F
Shaft bearing - does not contain
absolute bearing dimensions
Sensor A and B at 90° to each other
Direction of shaft rotation
Shaft centerline displacement during
measurement
rpm at cursor position
Shaft centerline plot
Measurement value: channel A / channel B
Static shaft
position
d
Mirroring the sensor arrangement
Measurement tasks
Shaft rest position
Methods for reading in the rest position