Vibration Guard mode

The smoothing curve and therefore the vibration-preventing effect are dependent on parameters and the Vibration Guard mode selected. Each mode has its own characteristic curve and effect.

The following modes are available when using Vibration Guard:

Modes 1 - 3

Mode 4:

Sensitivity ranges for a residual vibration of 5% at damping=0.1
Sensitivity ranges for a residual vibration of 5% at damping=0.1

The figure above results in the following standard values for each of the modes regarding acceptable percentage deviations to obtain residual vibrations of below 5%:

Table of standard values for sensitivity

Permitted deviations for max. 5% residual vibration (at damping=0.1)

max. negative deviation

max. positive deviation

Mode 1:

-3%

+3%

Mode 2:

-13%

+19%

Mode 3:

-20%

+33%

Mode 4:

-10%

+13%

Standard values for permitted percentage deviations between the frequency setting and the real frequency to obtain a residual vibration of below 5% (at damping= 0.1).

Comparison of Vibration Guard modes at corner contour (10 Hz and damping=0.1)
Comparison of Vibration Guard modes at corner contour (10 Hz and damping=0.1)

1

Vibration Guard Mode 1

2

Vibration Guard Mode 2

3

Vibration Guard Mode 3

4

Vibration Guard Mode 4

Example

example

Selecting the right Vibration Mode for an axis

Basic procedure:

  1. Measurements of machine frequencies at three points
  2. Calculation of percentage deviations
  3. Assessment of calculation results based on the above Table of standard value for sensitivity

Evaluation of results:

The deviations exceed the permitted range of Mode 1 (+/-3%) but are within of the permitted range of Mode 2 (-13%, +19%). The positive deviation for Mode 4 of +15% is greater than the permitted +13%.

So, in this example, Vibration Guard Mode 2 should be set to a frequency of 6 Hz.

A suitable programming command would then be: #VIB GUARD [FREQ=6 MODE=2]