VMI VIBER X4, Manual, Page: 46 / 58

Vibration Measurement Instruments
Balancing steps
There are 3 basic steps to performing a new balancing session:
1. Initial Run
After you have made the settings for the balancing session, the rotor must be run
at the balancing speed.
When the speed is stabilized:
• Press the OK key to start the initial measurement. This is the step when the bal -
ancing speed is saved in the rotor data. After this step, the speed is compared with
this value to calculate if it is within the set tolerance.
• Press the AUX key when the measurements are stable to save the value.
The saved rotation speed appears with a white background below the actual speed
readings.
• Press the RIGHT arrow to go to the next step.
To clear previously measured data (and also the balancing speed), press the Clear
key (F3). To repeat the measurement, press OK.
2. Trial weight run
Before starting the trial weight measurement, you need to edit the trial weight.
Edit trial weight
In this menu you enter:
• Radius Enter the radius of where you are placing the trial. If the value is al-
ready set in the Rotor settings, it will be displayed.
• Weight Mass of the trial weight.
• Number of positions With this function, the instrument distributes
the balancing weight to evenly distributed positions. This eliminates the need for
angle measurements in the rotor.
For example, if a fan has 6 blades then number the blades from 1 to 6 and write
6 in the setting for Number of positions. The instrument distributes the balaning
weight to the blades nearest to each side of the correct angle. The vector sum of
these two weights is equal to the calculated balancing weight.
The result is displayed in the form of two weights and two place numbers in the
balancing menu.
• Trial weight in position Here you enter the position where you have placed the
trial weight.
• Angle This is the angle where the weight should be attached measured from
the reference mark of the balancing plane against the direction of rotation of the
shaft.
46