BRUEL & KJAER VIBROCONTROL 8000 - 13.3.3 I-Factor % (Dynamic Collection Rate (% Change)); 13.3.4 Adaptive I-Factor

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13.3.3 I-Factor % (Dynamic Collection Rate (% Change))
The VC-8000 monitor will save a waveform whenever there is a significant change in vibration. The
patented I-Factor % allows you to tell the VC-8000 what you consider to be a “significant” or
“interesting” change in vibration amplitude.
The default I-Factor is 6%. The percentage is calculated with reference to the Danger Alarm setting of
the Direct measurement. If there is no Danger Alarm, then the percentage is calculated with
reference to the Full-Scale Range setting. Some examples are shown below.
Channel Danger Alarm
Full-Scale
Range
I-Factor % and Actual Value
Radial Vibration 4 mils
(25 µm)
10 mils
(254 µm)
5 %
0.2 mils
(5 µm)
Radial Vibration N/A
10 mils
(254 µm)
5 %
0.5 mils
(13 µm)
Axial Position 20 mils
(0.5 mm)
-40 to +40 mils
(-1 to +1 mm)
5%
1 mil
(0.025 mm)
Axial Position N/A
-40 to +40 mils
(-1 to +1 mm)
5%
4 mils
(0.10 mm)
Seismic 0.5 in/s
(12.7 mm/s)
1 in/s
(25 mm/s)
10%
0.025 in/s
(0.64 mm/s)
Seismic N/A
1 in/s
(25 mm/s)
10%
0.05 in/s
(1.25 mm/s)
Table 13-7) SAM Firmware revision for CMS functions
Row 1 in Table 13-7 shows a Radial vibration channel with a Danger Alarm of 4 mils (25 µm). The I-
Factor is set at 5%. A waveform will be saved when the Direct value changes (up or down) by more
than 0.2 mils (5 µm).
Row 2 shows a channel without a Danger Alarm. In this case the actual value of the I-Factor will be
calculated using the Full-Scale Range setting. The I-Factor is set at 5%. A waveform will be saved
when the Direct value changes (up or down) by more than 0.5 mils (13 µm).
13.3.4 Adaptive I-Factor
Adaptive I-Factor is a tracking mechanism that will adjust the I-Factor % in real time if too many (or
too few) waveforms are being collected. Normally the Adaptive I-Factor is enabled.
NOTE!
SAM (CMS) firmware 6.0.3050, and UMM firmware 4.02.9046 are required for adaptive I-
Factor.
The Adaptive I-Factor requires a target value for comparison. The Dynamic Collection Rate (Minutes)
setting is used as this target value. The Adaptive I-Factor compares the number of waveforms
collected with the target and adjust the I-Factor setting accordingly.