Bob Assistant - Reference Manual
2023-04-04 - Version 1.0
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7.11.
Bob started his learning but does not complete it. Why?
-
Discontinuous operation
: The machine operates very discontinuously and the learning process is
paused when it is stopped. It resumes when the machine is restarted, but the complete learning session will
take longer. If the 20% progress is not reached after 24 hours, see the following explanation.
-
Unsufficient vibration
: BoB ASSISTANT does not pick up enough vibration. Typically,
if the vibration
intensity is below 0.02g, BoB ASSISTANT will not be able to learn correctly
. The vibration amplitude
information is given by the learning report (see §
) . In this case, we recommend
moving the sensor closer to the machine's vibration source (motor, compressor, etc.)
7.12.
Why one BoB ASSISTANT is taking more time to complete its learning
than another one?
The complete learning mode lasts 7 days. The first learning session lasts between 1 hour and a few days
depending on the complexity of the vibra
tion signature (number of vibration sources…).
An intermittent device, for example, will take longer to analyze because the learning is stopped if the
machine is switched off. It will resume when the machine restarts.
7.13.
Why is BoB ASSISTANT learning several time in the first week of
operation?
After his first learning session, BoB ASSISTANT improves and continues to analyze the vibratory
phenomena of the machine for 7 days. You are informed of a new learning phase by a Learning message. It
is also normal for BoB ASSISTANT to refine its reports on the behaviour of your machine during the first
week.
BoB ASSISTANT can learn up to 20 different vibration regimes.
At the end of the 7 days, the analysis is stabilized and BoB ASSISTANT only alerts you when actual drifts
are observed.
7.14.
How to make an additional learning or start BoB ASSISTANT over?
To reset BoB ASSISTANT, simply press and hold (20 seconds) the device button. By restarting BoB
ASSISTANT after a flash erase process, it then restarts its learning mode as it did when it was first powered
up.
To trigger a complete relearning, or a complementary learning, you can also use the Downlink commands
4.1 Renew learning mode or add learning
7.15.
Some data are missing?
The main reason for data loss is a bad/low LoRa network coverage. You can check the signal strength
using the RSSI indicator provided by your LoRa Network Server:
•
from 0 to -90dBm: good coverage, no risk of data loss
•
from -90dB to -110dBm: medium coverage, low risk of data loss
•
-110dBm and lower: low coverage, proven risk of data loss
The metallic environment can also cause message loss (Faraday cage effect)
It is now possible to activate messages Acknowledgement (ACK), by sending the corresponding Downlink
command, see
§4.6 Enable/disable frame acknowledgement
7.16.
Missing data and operating time
If LoRa network coverage is low, Report messages may exceptionally not be received and will not appear
in your stream. Frames not received should be excluded from the operating rate: the corresponding 3 hours
