WATTECO BoB Assistant Manual de usuario

REFERENCE MANUAL

Reference: 50-80-001-001 / BoB Assistant EU 868MHz

Contact: support@watteco.fr

 
Bob Assistant - Reference Manual 
 
 
2023-04-04 - Version 1.0 2 
 
 
Table of contents 
I. Introduction..................................................................................................................................................................5 
1. Overview ..............................................................................................................................................................5 
2. Recommended fastening solutions..................................................................................................................6 
2.1. Magnets –default configuration..............................................................................................................6 
2.2. Rivet.............................................................................................................................................................7 
2.3. Screw...........................................................................................................................................................7 
3. Key Features........................................................................................................................................................8 
II. Functional overview.....................................................................................................................................................9 
1. Life cycle and Operating modes........................................................................................................................9 
1.1. Functional preview ....................................................................................................................................9 
1.2. Startup & initialization...............................................................................................................................9 
1.3. Operating modes.......................................................................................................................................9 
2. Device Interaction............................................................................................................................................ 14 
2.1. Device Startup......................................................................................................................................... 14 
2.2. Device power off..................................................................................................................................... 19 
2.3. Knowledge data set erase ..................................................................................................................... 20 
2.4. Battery value reset ................................................................................................................................. 21 
3. Battery Replacement....................................................................................................................................... 22 
4. BoB ASSISTANT v2.0 frequency analysis....................................................................................................... 24 
5. Frame identification header ........................................................................................................................... 25 
6. Peak frequency value ...................................................................................................................................... 25 
7. Manufacturing configuration ......................................................................................................................... 26 
7.1. Device default configuration ................................................................................................................. 26 
7.2. Labels ....................................................................................................................................................... 26 
III. Uplink payloads (Device to LoRaWAN server) ....................................................................................................... 28 
1. Introduction...................................................................................................................................................... 28 
2. LEARNING MESSAGE........................................................................................................................................ 28 
2.1. Payload structure ................................................................................................................................... 28 
2.2. Learning message payload data extraction example ........................................................................ 29 
2.3. FFT signal details..................................................................................................................................... 30 
3. REPORT MESSAGE............................................................................................................................................ 32 
3.1. Payload structure ................................................................................................................................... 32 
3.2. Report message payload data extraction example............................................................................ 34 
4. ALARM MESSAGE ............................................................................................................................................. 35 
4.1. Payload structure ................................................................................................................................... 35 
5. STATE MESSAGE ............................................................................................................................................... 36 
5.1. payload structure ................................................................................................................................... 36 
IV. Downlink (LoRa to device)........................................................................................................................................ 37 
1. Renew learning mode or add learning.......................................................................................................... 37 
2. Change sampling period................................................................................................................................. 37 
3. Enable/disable machine start/stop STATE MESSAGE .................................................................................. 37 
4. Change ALARM MESSAGE threshold ............................................................................................................. 38 

 
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5. Reset battery value –New .............................................................................................................................. 38 
6. Enable/disable frame acknowledgement –New.......................................................................................... 38 
7. Change Vibration threshold for On/Off detection –New ........................................................................... 39 
V. Charts examples ....................................................................................................................................................... 40 
1. Breakdown of the operating time of the machine ...................................................................................... 40 
2. Anomaly distribution....................................................................................................................................... 40 
3. Average unnatural vibration level in reports................................................................................................ 41 
4. Number of drift notifications ......................................................................................................................... 41 
5. Temperature .................................................................................................................................................... 41 
6. Maximum vibration value............................................................................................................................... 42 
7. Peak Frequency................................................................................................................................................ 42 
8. Report view....................................................................................................................................................... 43 
9. Vibration drift Alarm view............................................................................................................................... 44 
VI. Payload examples ..................................................................................................................................................... 45 
1. Raw payload ..................................................................................................................................................... 45 
2. Frame decode examples................................................................................................................................. 46 
2.1. LEARNING TYPE....................................................................................................................................... 46 
2.2. REPORT TYPE........................................................................................................................................... 47 
2.3. ALARM TYPE ............................................................................................................................................ 48 
2.4. STATE TYPE .............................................................................................................................................. 49 
VII. Frequently Asked questions................................................................................................................................ 50 
1. Why monitor vibrations and their drift?........................................................................................................ 50 
2. What are the main causes of vibration anomaly? ....................................................................................... 50 
3. Which type of equipment is well suited for BoB ASSISTANT? .................................................................... 51 
4. What is the temperature limit? ...................................................................................................................... 51 
5. When should BoB ASSISTANT be installed on the equipment? ................................................................. 51 
6. Can we start BoB ASSISTANT on a machine that is not running? .............................................................. 51 
7. Can BoB ASSISTANT or the machine be moved without disrupting its operation? ................................. 52 
8. What is the autonomy of BoB ASSISTANT V2 sensors? ............................................................................... 53 
9. How to evaluate LoRa coverage? What is the operating limit? .................................................................. 53 
10. First learning and complete learning, what is the difference? ................................................................... 53 
11. Bob started his learning but does not complete it. Why?........................................................................... 54 
12. Why one BoB ASSISTANT is taking more time to complete its learning than another one? .................. 54 
13. Why is BoB ASSISTANT learning several time in the first week of operation? ......................................... 54 
14. How to make an additional learning or start BoB ASSISTANT over? ......................................................... 54 
15. Some data are missing? .................................................................................................................................. 54 
16. Missing data and operating time ................................................................................................................... 54 
17. BoB ASSISTANT did not detect any anomalies, however, a failure occurred. What to do about it?...... 55 
18. What is the difference between alarm and notification?............................................................................ 55 
19. How to configure a notification trigger threshold?...................................................................................... 55 
20. Why does the learning progress report indicate a value outside of expected values (20%, 40%...)?.... 55 
21. Is it possible to check the activity and proper functioning of BoB ASSISTANT on request? ................... 56 
22. What is the range of BoB ASSISTANT (communication distance) in an industrial environment? .......... 56 
23. Are the transmitted data secure? .................................................................................................................. 56 

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7.24. I started BoB ASSISTANT, but no message arrives on the application...................................................... 56

7.25. How do I position BoB ASSISTANT on my machine? ................................................................................... 56

VIII. Document history................................................................................................................................................. 57

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I. Introduction

1.1. Overview

BoB Assistant is a low power LoRaWANTM compatible vibration and condition monitoring sensor for

indoor and outdoor predictive maintenance industrial applications, coupled with a temperature sensor for

environmental conditions, a push button and an RGB Led for User Interface.

BoB ASSISTANT will measure and analyze vibrations to detect abnormal behaviors of your industrial

machines, with artificial intelligence capable of detecting operating anomalies before a failure occurs.

BoB ASSISTANT’s casing is IP68 (dust and water proof). Edge AI makes it possible to process locally any

vibration that comes from your machine. The amount of data transmitted is then optimized and secured,

guaranteeing BoB ASSISTANT's autonomy for several years!

Very easy to install, BoB ASSISTANT does not require any configuration. Simply put BoB ASSISTANT on

your machine, start it, and after a just few hours of learning, BoB ASSISTANT takes care of your machine!

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1.2. Recommended fastening solutions

1.2.1. Magnets –default configuration

BoB ASSISTANT is delivered with a magnet kit, so you can put your device on your machine out of the

box.

Default configuration:

-Magnet (x2):

oManufacturer: BRUGGER MAGNET

oReference: A22AG-KsM4x6

-Nut (x2):

oManufacturer: BOSSARD

oReference: BN11207 / 3061765

Validated references:

Manufacturer

Reference

Pull Force

(kg)

Size (DxHxL / M)

Comments

BRUGGER

A43AG-KsM4x6

43x6x12mm / M4x6

Rubber coated magnet (outdoor

use, max 60°C)

BRUGGER

A22AG-KsM4x6

22x6x12.5mm / M4x6.5

Rubber coated magnet (outdoor

use, max 60°C)

ECLIPSE

E1053/NEO

20x6x15.5mm/ M4x9.5

Neodymium magnet (indoor

use, max 80°C)

ECLIPSE

E1054/NEO

25x7x16.5mm / M5x9.5

Neodymium magnet (indoor use

max 80°C)

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These magnets references have been successfully tested as compliant with ETSI 300-019 class 5.2 when

mounted on BoB ASSISTANT.

Class 5.2: all types of road vehicles used in areas with a well-developed road system, except tracked

vehicles, motorcycles, scooters and other vehicles with low mass. The equipment can be mounted on

surfaces which may be subjected to flying stones. The equipment may be mounted on passenger car

instrument panels to which high frequency vibrations from the engine, or from other parts connected to

the engine, may be transmitted. This class also applies to fork lift trucks and trains with soft suspension and

shock reducing buffers

1.2.2. Rivet

Rivet properties: Ø4mm, length 7/10.2/13.3mm

Drilling: Ø4.1mm / Ø4.2mm

Manufacturer

Reference

Comments

BOSSARD

BN 84545 / 8031215

Ring washer

BOSSARD

BN 1409 / 3206579

Rivet

1.2.3. Screw

Manufacturer

Reference

Comments

BENE INOX

211309

TF TORX 4x45mm wood screw

WURTH

0455000304

Cup washer

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1.3. Key Features

Radio:

Maximum transmission power 25mW in the band

868.0 to 868.6MHz

LoRa SF6-SF12

LoRa 1.0 Class A

LoRa Sensitivity: -137 dBm

Temperature range:

Storage: -25°C to +55°C

Use: -20°C to +55°C

RGB LED:

Network availability,

Learning stage,

Vibration status,

Learning restored,

Learning erased,

Battery reset

Sensor:

3-Axis Accelerometer

Temperature measurement

Vibrations measurement 0Hz-12800 Hz

Adjustable periodic sampling

Firmware:

Automatic learning process and reporting by

embedded artificial intelligence.

Possibility to add new learning or to reset learning.

AES-128 Encrypted data

Power supply:

Battery, 3,5 years (normal use)

Case:

Polyamide case

Dimensions: 76 x 79 x 23 mm

Weight: 75 grams

IP68 Protection

Tests and Certifications:

CE marking, qualified for industrial use in

accordance with

EN 61000-6-2.

ETSI EN 300 019:

Storage Class 1.2 Part 1.1

Transport Class 2.3 Part 1.2

Use Class 5.2 Part 1.5

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II. Functional overview

2.1. Life cycle and Operating modes

2.1.1. Functional preview

The following figure presents the different modes of operation of the device:

2.1.2. Startup & initialization

The first step when you install BoB ASSISTANT on a machine you want to monitor will be to start the

device, and make sure that:

othe LoRaWANTM Network is reachable

othe vibration level of the machine is high enough to start learning

See §2.2.1 Device Startup for more details.

When the Startup & initialization mode is over, BoB ASSISTANT will then have 2 operating modes :

oLearning and Reporting

oMonitoring and Alerting

2.1.3. Operating modes

2.1.3.1. Learning and reporting

This mode will last for 7 days, and will allow BoB ASSISTANT to learn the machine cycle(s). BoB ASSISTANT

will start by a first learning session, and will then start reporting machine activity. Each time a new vibration

signature is detected, BoB will start another learning session, in parrallel with the reporting mode.

Startup &

initialization

~a few minutes

•Check for

LoRaWANTM

Network availability

•Check if there is

Knowledge data in

flash

•Check for vibration

level

•Send "Device ON"

state message at the

end of the mode

Learning and

reporting

~7 days

•Learn any new

vibration signature

•Warn about learning

session(s) progress

•Send periodic report

on machine health

(drift percentage,

operating time,

anomaly prediction)

•Send machine state

(On/Off)

•Receive potential

Downlink commands

Monitoring

•Send Alarm messages

whenever the drift

threshold is crossed

(25% drift by default)

•Send periodic report

on machine health

(drift percentage,

operating time,

anomaly prediction)

•Send machine state

(On/Off)

•Receive potential

Downlink commands

Power off /

Battery

Swap / EOL

•Get to poweroff

mode

•Battery swap

•If End of life =>

device recycling

First

learning

session

Reporting Learning

session Reporting Learning

session Reporting Monitoring

mode

New Vibration

signature

New Vibration

signature

7 days

Will be skipped if

existing knowledge data

is in flash at startup

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2.1.3.1.1. First learning session

Once BoB ASSISTANT is started, it will enter a first Learning session, which will last for a few hours (~1 to

4 hours for a machine with a simple vibration cycle, e.g. Air Conditionning unit).

This learning session will create a first dataset for the embedded AI algortihms and store the

“screenshots” of the corresponding vibration signatures.

For each measure, it will perform a Fast Fourrier Transform (FFT):

It will then add each new signal information to the vibration signature dataset.

For example, after a few hours of operation, the dataset could have more than 30 “screenshots” for the

vibration signature of the machine:

In the first seven days of operation, BoB ASSISTANT will continue monitoring new vibration signatures,

and add them to the dataset.

After this period of time, no new vibration signature will be added to the dataset, unless it is required

through a Downlink command (see §IV Downlink (LoRa to device)).

During a learning session, BoB ASSISTANT will wake up every 60 seconds (default value, configurable,

see §4.2 Change sampling period) to sample the signal, perform the FFT of the vibration signature and

compare and record the sampling to the dataset. BoB ASSISTANT’s dataset is able to record up to 20

different vibration signature zones.

Not to scale

Sleep

mode

wake-up

and

sample

signal

FFT

calculation

Vibration

screenshot

compare

and record

Device processing activity during learning sessions

time

Learning sampling period =

60 seconds

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