BRUEL & KJAER VIBROCONTROL 8000 - 13.3.5 Boost Mode; 13.3.5.1 Low Trigger (RPM), High Trigger (RPM) - Boost Mode Data Collection

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VC-8000 MPS
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13.3.5 Boost Mode
In Boost Mode the rack suspends Delta RPM and I-Factor
waveform collection, and begins saving all waveforms
continuously. It is ideally suited for electric motor start-ups
which are measured in seconds rather than minutes.
Boost mode channels require five settings (Boost Mode
enabled, Phase Trigger association, Delta RPM, High Trigger
(RPM), Low Trigger (RPM))
When enabled, a channel enters Boost mode when the
speed is between the Low and High Trigger range (see
13.4.1), and the speed is changing (Delta RPM).
A channel exits Boost mode when the speed is outside the Low and High Trigger range or when the
speed has not changed (Delta RPM) for 10 seconds (or if a phase trigger error occurs).
Additionally, the channel will exit Boost mode if the UMM memory fills up. When the channel exits
Boost mode it reverts to standard sampling. This provides time for the UMM to send the waveforms to
the CMS system. When at least 25% of the memory is available the channel will return to Boost Mode
(given that the Boost Mode criteria is still being met).
APPLICATION ALERT
Use Boost mode with discretion.
Collecting too many waveforms will impact data base storage and CMS system
performance. Normal waveform collection is sufficient for most machines.
To avoid collection of too many waveforms, Boost Mode parameters must be set with clear
knowledge of the machine speeds. Set the Low Trigger at least 100 RPM greater than the expected
slow roll value. Set the High Trigger to at least 100 RPM below running speed. If the machine speed
fluctuates make sure the High Trigger is 100 RPM below the lowest speed of the machine.
Boost Mode should not be enabled on a machine that starts/stops many times a day; too many
waveforms would be collected (repeatedly). In these cases, Boost Mode would only be enabled
temporarily when the high-resolution waveform data is needed.
For large VC-8000 systems, moving the full amount of Boost Mode memory into CMS PI/XC can take
up to 20 minutes.
13.3.5.1 Low Trigger (RPM), High Trigger (RPM) – Boost Mode Data Collection
The Low to High Trigger setting defines the machine transient window. This window is used to control
Boost Mode, Exception Deviation, and PI Compression Deviation.
For more information see 13.4.1.
Figure
13-3) Boost Mode Configuration