User's Manual

Brand of ACOEM

4.5.1 Machine setup

This tab gives access to following parameters:

 Number of planes: 1 to 4

This refers to the number of planes on which balancing weights are to be installed. This number also

determines the number of measurement points, as well as the number of runs required to perform the

balancing:

o Number of points = number of planes

o Number of runs = 1 (Free run) + number of planes (Trial runs)

The following table will enable you to make your selection, where l stands for the length of the rotor and d

its diameter:

l/d

NUMBER OF

PLANES

EXAMPLES

< 0,5

1 if < 1000 CPM

2 if > 1000 CPM

FAN

>0,5

1 if < 150 CPM

2 if > 150 CPM

ELECTRIC MOTOR

1-plane machine +

2-plane machine

2 coupled

2-plane machines

 Direction of rotation rotor viewed from plane 1: clockwise or counter clockwise. This used only for 2-plane

balancing for 3D view of the rotor.

 For each plane:

o Plane identification: up to 10 characters

o Radius. The radius is used to estimate the trial weight and to calculate the balancing quality grade

o Number of angle units per rotation. This is used for the weight angular position.

For instance: 360 for the unit in degree.

This system enables you to use rotational divisions, which are much more convenient than the

degree. As an example: with an 8-blade fan, if you define the angle unit as "8", the said unit then

corresponds to the angle that separates two consecutive blades. The original blade corresponds to

0, the following one to 1, and so on, up to 7 (beware of the positive angle: see appendix 12.1). If

the position of the balancing weight is 2.05, this means that the weight must be added to blade

number 2.

Note: the vibration phase is independent of this setting and is always in degrees.