User's Manual

Brand of ACOEM

4.5.4 Units and control setup

This tab gives access to following parameters:

 Trial weight unit: g, kg, lb, oz

 Radius unit: mm, cm, m, in

 Machine class (ISO 1940): select the machine type in the list (G0.4 to G4000). The balancing result is

compared with the selected class.

 Machine group (ISO 10816-3): select the machine type in the list. On each measurement screen you can

compare the vibration level generated by the unbalance (vibration at rotational speed) with the selected

group limit. At the end of the acquisition the red circle indicates this vibration limit. The limit used is the one

between zone B and C i.e. when the machine is “normally considered unsatisfactory for long-term

continuous operation”.

 Rotor weight: it is used to estimate the trial weight and to calculate the balancing quality grade

 Rotor weight unit: g, kg, lb, oz

 0 dB reference: for spectrum displayed in dB.

4.6 RUN-OUT MEASUREMENT

Note: this step is only accessible if the input type is “proximity probe”.

Definition of the run-out

The proximity sensors operating with eddy current probes are sensitive to irregularities of the surface pointed by

the sensor (shape, cracks, carbon inclusions, magnetized areas, etc.).

The signal provided by the Run-Out is at the rotation frequency of the machine and is thus merged with the

unbalance phenomenon.

If the Run-Out level is high, it must be taken into account, otherwise the values of the weights calculated by the

program will compensate the Run-Out signal (which has no effect on the machine) by an unbalance (noxious effect

on the machine).

Measurement of the Run-Out

The run-out can be measured while the machine is rotating very slowly. In fact, the run-out amplitude remains

unchanged when the rotation speed varies, whereas the unbalance effects are negligible at low speed, and make

their presence felt only when the speed increases.

Run-Out Measurement screen

The screen is similar to any other measurement screen, see next chapter for more details. This measurement must

be performed at the lowest possible speed.

Run-Out compensation

On the result step (Balancing or Trim), there is an option to compute the balancing weight with the Run-out

compensation.