Occasionally, you have to just switch off. But when is the right point in time? In the case of a wind turbine that has to be powered down in the event of danger, the mast vibration phase - zero-axis crossing or maximum - in which the turbine is stopped to prevent the mast from receiving an 'additional kick' that causes damage may be crucial. This point can be set precisely with the new SIL2 vibration sensor NVA115 from TWK. If the mast vibrations exceed a permissible limit value, the two safety contacts open and the safety chain is interrupted - in the precise phase. Designed for the wind energy sector, this sensor registers vibrations from 0.1 to 60 Hz and protects the turbine from damage caused by oscillations and vibrations. The measured value is evaluated using adjustable frequency filters and supplied to three types of interface: 2 x analogue - e.g. for the x and y axis, CANopen Safety and two safe switching contacts. The measured acceleration value can be output and further processed as a momentary or peak value, as an RMS mean value or as an integrated value. The latter function is important to ensure that the turbine is only shut off when an adjustable acceleration limit value is exceeded slightly but over a long period of time - up to a number of hours. A Fourier frequency analysis that determines the frequency spectrum rounds off the variety of functions offered by the NVA115/S3. It completes the safety sensor range available from TWK: rotary encoders, switching cam encoders and inclinometers.
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Vibration sensor SIL2: NVA115
26/10/2016 10:00