X20 system modules • Other functions • X20CM4810
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X20 system User's Manual 3.10
4.26.2.2.8 Filter configuration
The X20CM4810 has a number of configurable filters.
There is an adjustable high-pass filter for the whole module that can be configured using "HighFrequencyConfig01".
Possible settings are 500 Hz, 1 kHz and 2 kHz. This high-pass affects all high-frequency and envelope characteristic
values of all module channels.
In addition, there are two adjustable low pass filters per channel.
•
For the raw signal. This filter is configured using "MaxFrequencyRaw01". Possible settings are 200 Hz,
500 Hz, 1 kHz, 2 kHz, 5 kHz and 10 kHz.
•
For the envelope signal. This filter is configured using "MaxFrequencyEnvelope01". Possible settings are
200 Hz, 500 Hz, 1 kHz and 2 kHz.
These low-pass filters affect all calculated characteristic values of the respective signal, i.e. the raw or envelope
signal. They can be used to increase the frequency resolution of the FFT. When calculating characteristic values in
AnalogInput, however, it is possible to select whether the characteristic values should be calculated directly from
the input signal or from the low-pass filtered raw signal.
4.26.2.2.9 Frequency bands
It is possible to individually configure up to 32 frequency bands where the effective value (RMS) or the noise of
a quadrant is calculated.
Configuration:
Parameter
Settings
Enable
Off | RMS | Noise
Channel
1 | 2 | 3 | 4
Source
Raw acceleration signal | Raw velocity signal | Enveloped acceleration signal | Enveloped velocity signal
Calculation of harmonics
(RMS only)
Yes | No
Rotation-dependent
(RMS only)
Selects the data point for velocity ("ActSpeed01-04")
[1/100 Hz]
Standardized damage frequency at 60 rpm
[1/100]
On
± Width of the frequency band (tolerance band)
[1/100 Hz]
Lower frequency
[1/4 Hz]
Off
Upper frequency
[1/4 Hz]
Quadrant (noise only)
1 Quadrant | 2nd Quadrant | 3rd Quadrant | 4th Quadrant
4.26.2.2.10 Characteristic values
The following condition parameters can be read from the X20CM4810 module for each channel:
Characteristic values
Description
Absolute maximum of the high-frequency portions of the input signal. The high-pass filter can be configured with the
"HighFrequencyConfig01" register.
1)
Ratio of the maximum amount to the RMS value ("Crest factor") of the high-frequency portions ("PeakHighFrequency"
and "RmsHighFrequency") of the input signal
Ratio between the reference values and the currently measured values of the high-frequency portions of the input signal
in accordance with the VDI 3832 guideline
Peak value (absolute) of the input signal up to the maximum frequency ("MaxFrequencyRaw01") of the channel
Crest factor (peak-to-average power ratio) of the input signal up to the maximum frequency ("MaxFrequencyRaw01") of
the channel
Peakedness, fourth statistical moment (kurtosis) of the input signal up to the maximum frequency
("MaxFrequencyRaw01") of the channel
Ratio between the reference values and the currently measured values of the input signal in accordance with the VDI 3832
guideline
RMS value of the high-frequency portions of the input signal. The high-pass filter can be configured with the "HighFre-
RMS value of the input signal up to the maximum frequency ("MaxFrequencyRaw01") of the channel
RMS value of the acceleration of the input signal from the configured minimum frequency ("MinFrequencyRaw01") up to
the configured maximum frequency ("MaxFrequencyRaw01") of the channel
RMS value of the speed of the input signal from the configured minimum frequency ("MinFrequencyRaw01") up to the
configured maximum frequency ("MaxFrequencyRaw01") of the channel
2)
Effective value of the velocity in the frequency domain 10 Hz to 1 kHz in accordance with ISO 10816
RMS value of the acceleration of the envelope from the configured minimum frequency ("MinFrequencyEnvelope01") up
to the configured maximum frequency ("MaxFrequencyEnvelope01") of the channel
RMS value of the speed of the envelope from the configured minimum frequency ("MinFrequencyEnvelope01") up to the
configured maximum frequency ("MaxFrequencyEnvelope01") of the channel
2)
Table 723: Characteristic values
1)
Only available in Function model 0 - Standard
2)
Only calculated if the EnableVelocityCalculation bit (configured in the "SensorConfig01" register) of the respective channel is set; otherwise, 0 is output.
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