WiVIB1-15.4

 

WiVIB1 uSIM Single/Three Axis Vibration Measurement for Condition Base Maintenance with IEEE 802.15.4 (Zigbee) Mesh Network

 

 

3 Axis Accelerometer showing stud mount

 

 

INTRODUCTION

 

 

The WiVIB1 (See Appendix for block diagram) is the first in a series of wireless micro sensor interface modules (uSIM) with a broad range of wireless options. The WiVIB1 is a revolutionary “game changer” wireless vibration monitor/switch device which measures about 1 square inch including sensor, radio and advanced RISC processor. It operates under battery power. It is available in both single axis and three axis versions.

 

The WiVIB1 presently has three(3) radio options

 

1) WiVIB1- 15.4 - IEEE 802.15.4 radio at 2.4 gigahertz (Zigbee)

2) WiVIB1 - ISA100

3) WiVIB1- WiFi - IEEE 802..11 ultra low power 802.11 b/g radio

 

Each of these modules are available in single axis and three axis configurations. The WiVIB1 is a device for condition based maintenance vibration analysis and a vibration switch in one tiny package.

 

The WiVIB1(pronounced why vibe one) does not use any external wires and does not use a traditional remote piezoelectric sensor attached to the vibrating machine with a wire. The unit is so small (about 1 square inch, the size of a postage stamp) it mounts directly on the vibrating device and sends the information via a wireless link.

 

The WiVIB1 uses advanced MEMS technology to provide the vibration sensor and the unit is all digital. The MEMS vibration sensor includes an on-board Analog to Digital Converter (ADC) and samples at ~ 100,000 samples per second with 22khz sensor resonance. Using the wireless communication link the user can set thresholds for vibration peaks which are anomalous. When these thresholds have been reached, an interrupt (alarm) will be sent to the microprocessor and an alert will be sent to the central control room via the wireless link.

WiVIB1 as Vibration Switch

What is a Vibration Switch

A vibration swich is a device that  recognizes the amplitude of the vibration and provides a predetermined response when the amplitude exceeds a preset threshold. 

Solid State Relay

The wireless switch can be use to activate a solid state relay (SSR) to shut down the vibrating device in distress and send a message to the control room. We now have a vibration switch which gives notification to the control room that the motor, etc. has been deactivated and continuous status reports can be sent. If the device was shut down due to anomalous behavior it can be restarted from a remote location.  Since the vibration switch is microprocessor controlled various time delays can be programmed.

Please note that in the past MEMS accelerometers did not have the bandwidth and sampling rates to do vibration analysis comparable to piezoelectric sensors. This is no longer true and MEMS accelerometers can match and even exceed the capabilities of piezoelectric accelerometers.


Since WiHART Systems adheres to a “no wires” design architecture the WiVIB1 can operate as a vibration switch with a wireless remote power control. Traditional vibration switches utilize a long wire to reach the power control of the device to be shut down.  The WiVIB1 can utilize a wireless solid state relay as a separate remote radio unit. When the vibration sensor encounters an anomaly and wishes to shut down the device it sends a wireless message to the solid state relay(SSR) (standard part is 660 volts at 5 amps, optional SSR is 25 amps). If the power cutoff is close to the sensor then the SSR can be packaged with the sensor and a short wire can be added.


Solid State Relay


The WiVIB1 is 100% digital and can be programmed and configured over the radio with multiple set-points and alarm types


3 Axis acceleromter

 

The WiVIB1 is available with a 3 axis accelerometer in one small module and does not require 3 external piezoelectric devices requiring additional power hungary electronics to obtain the vibration data.

 

Fast Fourier Transform (FFT)

The WiVIB1 will execute an FFT (Fast Fourier Transform) locally to obtain frequency spectrum. The WiVIB1 does not require a back end processor to generate a frequency spectrum from the time domain data.

ACCELEROMETER   FEATURES

  • Digital ±70 g accelerometer/vibration sensing
  • 22 kHz sensor resonance
  • 100.2 kSPS sample rate
  • SPI-compatible serial interface
  • Programmable data capture function:
  • Manual trigger for user initiation
  • Automatic trigger for periodic data capture
  • Conditional trigger for condition-driven capture
  • Digital temperature sensor output
  • Digitally controlled sample rate
  • Digitally controlled frequency response
  • Digitally activated low power mode
  • Serial number and device ID
  • Operating temperature range: -40C to +125C
  • Solid State Relay

 

IEEE 802.15.4 (Zigbee)


 The WiVIB1 is available using IEEE 802.15.4 with the Zigbee industrial wireless standard.

Zigbee operates in the 2.4 Gigahertz band using the IEEE 802.15.4 radio standard with direct sequence spread spectrum communication. It is a mesh network with redundancy. The standard was primarily established for use in homr automation, automatic meter reading (AMR) and other applications but there are working groups for upgrading to other applications.

 

Zigbee is an ad hoc network in the sense it does not require a centralized network manager and security manager.

For more information. www.zigbee.org

 

The WiVIB1 uSIM utilizes the same radio module as the WiWIZ1. It is completely self contained with microprocessor, radio and sensor. The ISA100 software stack is executed by the microprocessor.

 

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