DE - 502

Medium Not assessed Fan on HVAC / HV-FAN-502

Medium In alert

09b36730, abcc6f92 at medium priority, data as of 2026-10-26 22:49. The evidence is below: the likely faults and what changed. The alert ends when the point is back at low: when someone acknowledges it, or by itself if newer measurements no longer support the change.

Acknowledge it ↓

Likely faults

Fault	Likelihood	Seen on
Rotating looseness	70%	stream 09b36730, stream abcc6f92
Lubrication issue	60%	stream 4bf80077
Process related loading	40%	stream 4bf80077
Process related harmonics	30%	stream 09b36730, stream abcc6f92

Each axis is analysed on its own; a fault seen on several shows the highest likelihood any of them reports, never a sum.

What changed

Low Frequency Change in velocity for low frequency band <<2-8:Hz>> for mode 5 has been detected.	stream 09b36730, stream abcc6f92	2026-10-15 09:52
Emerging Mode New mode 6 has been detected.	stream abcc6f92	2026-10-15 09:52
Jump in Envelope Peak Score Typical level of Envelope Peak Score has increased from <<1.36:g^2>> to <<2.72:g^2>>.	stream 09b36730	2026-10-14 09:48
RMS Increase An increase in RMS has been detected for mode 1 from <<0.719:g>> to <<1.408:g>>.	stream 4bf80077	2026-10-14 09:48
Emerging Mode New mode 5 has been detected.	stream 09b36730	2026-10-11 10:14
Jump in Envelope Peak Score Typical level of Envelope Peak Score has increased from <<0.92:g^2>> to <<2.59:g^2>>.	stream abcc6f92	2026-10-11 10:14
Low Frequency Change in velocity for low frequency band <<17-23:Hz>> for mode 2 has been detected.	stream 09b36730	2026-10-04 02:03
RMS Increase An increase in RMS has been detected for mode 2 from <<0.457:g>> to <<0.683:g>>.	stream 09b36730	2026-10-04 02:03
Low Frequency Change in velocity for low frequency band <<2-8:Hz>> for mode 1 has been detected.	stream 4bf80077	2026-10-04 02:03
Low Frequency Change in velocity for low frequency band <<12-18:Hz>> for mode 1 has been detected.	stream 09b36730	2026-09-28 17:25

Trends

Measurement time 2026-09-26 22:54 to 2026-10-27 13:38 (UTC). ▏went into alert · ▏back to low, cleared or as the evidence faded — from Multiviz's priority history.

Vibration level

How strongly the machine vibrates at this point. A rise here is what usually lies behind an alert: compare it with the alert marks.

Velocity RMS · mm/s Stream 09b36730 1.32 mm/s Stream 4bf80077 1.12 mm/s Stream abcc6f92 1.45 mm/s

Reported by the sensor itself, about every 5 min. MultiViz also computes it from each waveform (about every 13 h); the sensor's value is shown because it comes more often. The two may differ: each uses its own frequency range.

Impacting

Short, sharp impacts, as from a damaged bearing, raise crest factor and kurtosis — often before the overall level moves.

Acceleration RMS · g Stream 09b36730 0.287 g Stream 4bf80077 0.357 g Stream abcc6f92 0.303 g

Crest factor · peak ÷ RMS, no unit Stream 09b36730 3.4 Stream 4bf80077 3.84 Stream abcc6f92 3.27

Computed by MultiViz from each vibration measurement (waveform), about every 13 h.

Kurtosis · no unit; about 3 when nothing is impacting Stream 09b36730 3.1 Stream 4bf80077 3.71 Stream abcc6f92 2.71

Computed by MultiViz from each vibration measurement (waveform), about every 13 h.

Operating conditions

What the machine was doing. A change in speed or temperature explains many changes in vibration.

Temperature · °C latest 31 °C

Reported by the sensor itself, about every 5 min.

Speed

Nothing recorded for this measuring point yet.

Sensor health

About the sensor, not the machine: a flat battery or a weak signal shows up as gaps in the data.

Sensor battery · % latest 100 %

Reported by the sensor itself, about every 5 min.

Signal strength · unit not reported latest -40

Reported by the sensor itself, about every 5 min.

Acknowledge

Your verdict, recorded here and sent to Multiviz as a clear of the point: its priority drops to low and rises again only on what is detected after now. That ends the alert. It counts once Multiviz has accepted the clear.

Axes

Axis	Priority	Latest measurement
Stream 09b36730 — sets the priority	Medium	2026-10-26 22:49	Analysis and trends →
Stream 4bf80077	Low	2026-10-26 22:49	Analysis and trends →
Stream abcc6f92	Medium	2026-10-26 22:49	Analysis and trends →

History

Priority

Each time the point's level changed, from Multiviz's priority history (bounded by the deployment). A fall to low says how the alert ended: a clear, or the evidence faded.

Data as of	Priority	What happened	Because of
2026-10-26 22:49	Medium	Went into alert	an analysis
2026-10-26 22:49	Low	—	an analysis

Clears

Never cleared.