X20 system modules • Other functions • X20CM4810
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X20 system User's Manual 3.10
Speed-dependent RMS
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Frequency
1)
2)
Frequency band
Frequency bandwidth is formed of the lower and upper frequency band limits.
1)
Lower frequency band limit:
"FrequencyBandxxLowerFrequency"
2)
Upper frequency band limit:
"FrequencyBandxxUpperFrequency"
Restricting the frequency range allows certain errors to be identified easily.
One example of this is imbalance. This is clearly shown by an increase in the frequency line for speed. Forming a
selective characteristic value for the speed frequency can thus improve classification.
Selective characteristic values can also be formed for RMS values formed from the envelope.
Damage to the outer ring is shown more clearly in the increase of the frequency known as the bearing damage
frequency. Damage to the outer ring is shown in the increase of the component of the outer ring damage frequency.
This bearing damage frequency is generally available from the bearing manufacturer.
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[
m
g]
Frequency [Hz]
Harmonic of the base signal
Damage frequency
Figure 678: Selective characteristic value for outer ring damage
Bearing damage on the outer ring can be found early by the parameters of a characteristic value with a frequency
range that encompasses the damage frequency.
If frequencies are entered that are outside the minimum and maximum signal frequency for the selected channel,
then only the domains between the minimum and maximum frequency will be analyzed.
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Frequency [Hz]
MaxFrequenzyRaw
configured to 1 kHz
Frequency band
configuration
Figure 679: Restricting the frequency band evaluation
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