X20 system modules • Other functions • X20CM4810
X20 system User's Manual 3.10
2103
Description of individual characteristic values
Sum of maximum value
The maximum value is often also referred to as the peak value.
The peak value of a mechanical oscillation signal indicate the maximum sum of individual impacts that come from
the ambient noise. Different types of damage give rise to strong impacts, which show up in the peak value.
PeakHighFrequency
Maximum sum formed from the high-frequency portions of the input signal of the oscillation acceleration in the
frequency range between "HighFrequencyConfig01" (500 Hz – 2 kHz) and 10 kHz.
Example:
Loose components in the motors
PeakRaw
Maximum sum formed from the raw signal of the oscillation acceleration up until the configured maximum frequency
("MaxFrequencyRaw01") of the channel.
Example:
Late-stage bearing damage
RMS value
The RMS value is also known as the quadratic mean, or the root-mean-square. Along with the amplitude, it also
takes the energy content of the oscillation into consideration and is the mathematical background for many char-
acteristic values of assessment.
If the RMS is calculated to be above the oscillation velocity, this can be referred to as oscillation speed. In the RMS
value, everything contributing to the oscillation is added up. The high oscillation amplitudes of an imbalance are
the same as the low oscillation level of bearing damage that is just beginning to occur.
If the RMS value is measured broadly, changes in individual elements contributing to the oscillation can be masked
by the message. Early and reliable detection of damage, e.g. due to defects in roller bearings, is only conditionally
possible.
