User's Manual

Brand of ACOEM

4.7 FREE RUN

After installing the vibration sensor and the tachometer, run the machine at its usual speed. This run measures the

vibration at the rotation speed.

Functions of the screen:

Tachometer setup.

Note: the free run is usually the first measurement, use this function to set tacho parameters (see § 2.4).

Acquisition: wait for the machine to reach its steady state before starting the acquisition. During the

acquisition, a dot is displayed for each average. If dots are not all in the same place, it shows that vibration

dispersion may be too high. At the end of the acquisition the red circle indicates the vibration limit corresponding to

the ISO 10816-3 selected in the setup.

Note: if it is a 2-plane balancing done using only one channel, click on the circle to select the measured point.

Spectrum measurement without tacho: if there is no tacho on the machine, it is possible to use this function

to measure the spectrum and check if the machine is unbalanced. If an important level is seen at rotation speed,

you can then stop the machine, install the tacho and proceed to balance it.

See spectrum.

Note: it is important to display the spectrum after the free run to confirm that the problem of the machine is

unbalance. The amplitude at the rotation must be larger than the other ones. If not there are certainly other actions

to do on the machine before balance it.

Quality of measurement: gives access to the dispersion of vibration and rotation speed. FALCON includes

an automatic analysis of the measurement. If an abnormal event is detected the measurement screen display an

alert pictogram ( ). If it is displayed the quality screen gives additional information:

 Rotational speed unsteady during measurement

 Measurement dispersion is important.

For the other runs, there are also following messages:

 Trial weight

insufficient: measurements are too close from a previous one

 Rotational speed too far from the free run’s one

Go to previous step

Go to next step

Go to the steps browser to reach directly any other accessible step (see § 4.11)

Exit: return to balancing test list (see § 4.3)

Symbols used on measurement screen:

 Free run:

 Trial runs: , , …

 Balancing run:

 Trim runs: , , …

Note: 3 and 4-plane balancing is displayed in tabular mode only.