VMI VIBER X5 MKIII, Инструкция по эксплуатации инструмента

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place the weight and the radius (for both 1
st
and 2
nd
plane) by selecting the value to be
edited with (UP) or (DOWN) Arrow key pressing (F3), the weight (and position) will
be recalculated for the new values.
If you edit the balancing weight radius for either 1
st
or 2
nd
plane the weight for the angle
position displayed in the Vib 1 and Vib 2 info window be recalculated for the new values.
If you press (F2) Change unit the window will display the response matrix and vibration
value as during the measurement.
When you have mounted the balancing weights sometimes a small unbalance will remain.
You can then select to continue with fine balancing and the instrument calculates new
Fine
balancing weights in the same way as the instrument calculated the balancing weights. The
number of Fine Balancing steps you can make is limited to 64.
The Fine balancing weights are calculated so that they only will balance the remaining
unbalance and we must therefore keep the first balancing weights in the balancing planes.
If the radius is changed the weight will be recalculated to correspond to the new radius.
There are several reasons why we have to add Fine balancing weights:
• It is often difficult to place the balancing weight exactly in the angle that the instrument
had calculated.
• It is often difficult to place the balancing weight on exactly the radius we have written in
the instrument.
• The stiffness of the bearing support is nonlinear and depends on the vibration level.
After the balancing weights are in place you should to start the machine and measure at
least one more time to check the result. You may have made a mistake when you mounted
the balancing weights or another fault may have a risen in the machine.
8.7. Edit Trial Weight
After you have made Initial run you will enter into Edit trial
weight menu.
Here you enter the parameters for the Trial Weight (TW)
Radius: Enter the radius on where you are placing the trial
weight
Weight : Mass of the trial weight. If you press (F3) the Instrument will calculate an
estimated weight.
NOTE! The calculated trial weight can have large errors and gives only a hint of the
weight and angle. There is no need to make and place the trial weight exactly as the
calculated values, because it is only a trial weight. The calculated trial weight is only a
proposed trial weight. You do not need to mount exactly the calculated weight. The
proposed trial weight gives you a hint of the size of the weight.
If the shaft speed is close to a structural resonance in the machine we might have a large
amplification of the vibration. In this case the proposed trial weight might be too large.
You must write the weight and position of the “real” trial weight you have mounted in
the machine.
Figure 8-15: Edit Trial weight