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SementhilK

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  1. Sad
    SementhilK reacted to David Carlson in vibration problem in #40 anemometer   
    Hello,

    Thank you for your question.  Those sensors were purchased in 2007, and so are currently covered by warranty.  When you have cases like this please contact your Sales Account Manager here at NRG, or contact technical support via email (support@nrgsystems.com).

    All the best,
    Dave
  2. Like
    SementhilK reacted to Julia Austin in Is one of the spikes on the frequency plot [from the webinar presentation] the actual rotation rate?   
    Q: Is one of the spikes on the frequency plot the actual rotation rate?


    A: These smaller spikes in the frequency plots are typical natural frequencies of the boom.
  3. Like
    SementhilK reacted to Julia Austin in If I buy sensors now, could they have this vibratory mode?   
    Q: If I buy sensors now, could they have this vibratory mode?


    A: Yes, until you hear otherwise. We estimate that 20-30% of all sensors manufactured after 2006 are affected by this issue.
  4. Like
    SementhilK reacted to dlutat in Down tower grounding   
    Regarding tower configurations, we have a 34m tall tower of which only 75 feet was erected, due to a test configuration on a small turbine. I have three guys installed at right angles for a total of twelve. I have read the announcement regarding the down tower grounding on NRG tall towers. While the literature states that the announcement applies to all NRG tall towers, is there any consideration I need to make for this configuration regarding the instruments a third party installs? I just want to ensure that my interpretation of the literature and test analysis is correct for the height we have installed. Thanks! 
  5. Like
    SementhilK reacted to ibrochim in Download partial files (yes or no)   
    Dear all,
     
    I have a problem with iPack setting, in tab "settings" there's a choice for "Download partial files". When i choose (thicked) "yes" and i press "call now" email succeed sent but when i change with "no" and i press "call now", error 2421 appears and disconnecting suddenly.
    what should i do?. Thank you
     
    regards
  6. Like
    SementhilK reacted to Julia Austin in What is your recommendation on parallel installs other manufacturers' sensors alongside the 40C to compare the data (i.e. at what height and direction to install new, third party sensors)?   
    Q: What is your recommendation on parallel installs other manufacturers' sensors alongside the 40C to compare the data (i.e. at what height and direction to install new, third party sensors)?


    A: There is no consensus on best practice as it relates to tower configuration; preferences will vary depending on priorities. Some of our customers pair different anemometers with #40Cs at the same level. The height and direction is typically dictated by site conditions and prevailing winds. 
  7. Like
    SementhilK reacted to johng in Protection of Wiring in Marine Environments   
    For additional corrosion protection of your logger and sensor wiring, applying a
    petroleum jelly (Vaseline, non-corrosive) to all of the sensor and
    logger terminals can be effective.  

    Other options include commonly available dielectric grease which is purpose made for preventing corrosion of electrical connections.  The grease is non-conductive (so there is no need to worry about electrical leakage or shorts), is very slippery and available at auto parts stores.
    One such example is: http://www.jamestowndistributors.com/userportal/show_product.do?pid=8196 


     
     



  8. Like
    SementhilK reacted to Julia Austin in Once an anemometer shows signs of dragging, how often will it go into the vibratory mode? 30% of the time in 5-10m/s wind? 70%?   
    Q: Once an anemometer shows signs of dragging, how often will it go into the vibratory mode? 30% of the time in 5-10m/s wind? 70%?

    A: An anemometer susceptible to the vibratory mode will tend to switch into its normal mode at higher wind speeds (above 10 m/s) and at very low wind speeds (below 5 m/s). In the 5-10 m/s range it will vary by sensor and its environment. In answer to this specific question, we don't have a basis by which to identify a typical percentage. We estimate that 20-30% of all sensors manufactured after 2006 are affected by this issue.
  9. Like
    SementhilK reacted to Julia Austin in Does NRG plan to develop any tools that will aid in identifying and cleaning these areas of bad data?   
    Q: Does NRG plan to develop any tools that will aid in identifying and cleaning these areas of bad data?


    A: We are working closely with our round table experts and hope to share some of our findings on techniques and methodologies to address this issue.


     
  10. Like
    SementhilK reacted to jcmaesch in CRC's do not match   
    Hello,
    I am getting the following message when I try to open any RWD file from a met tower:
    "Warning! One or more CRC's do not match - possible bad data. It is likely you need to set the correct PIN in your site file."
    I set and installed a new data logger with a satellite iPack on that met tower. I am receiving data to my mail with no problems, but I can't see the right values because of the encryption issue it seems I'm having. It is strange because I set a site number and a PIN in the data logger, but the RWD files I am receiving have a different site number than the one I set. What would be the right way to get this problem solved?
     Thanks in advance for your support!

  11. Like
    SementhilK reacted to Julia Austin in Do you have an estimated timeline for when field testing and reengineering [sic] will be complete?   
    Q: Do you have an estimated timeline for when field testing and reengineering [sic] will be complete?


    A: We can?t provide specific timelines. Our validation criteria require that we collect data from 50 pairs of anemometers for eight weeks. Only when we have sufficient data, and consensus that the sensors are performing up to pre-2006 standards, will we form conclusions and move ahead. There is a short amount of time on either side of those eight weeks to complete engineering activities, deploy sensors, and ramp up manufacturing.
  12. Like
    SementhilK reacted to johng in How do I interpret the SDR wind rose report?   
    See the example PDF above...
     
    The extension of each bar in the wind rose from ?inner
    circle? towards ?outer circle? represents the percentage of the time the wind
    blew from those various directions. 
     
    The outer circle percentage indicates
    the amount of relative uniformity of the wind direction.  For example, if
    there was a very strange site where the wind only blew from one direction all
    the time, and never from any other direction, there would be a single bar going
    out from 0 to 100%.  Most sites, however, have more scatter with wind
    directions distributed among numerous directions. 
     
    All of the bars
    extending out will of course add up to 100% of the time period that was
    measured.  The ?outer circle? value is intended to provide some context
    for the graph so that at a quick glance, you can tell that at the site below,
    almost 30% of the time, the wind direction was southwest, another 25% or so was
    north, and then the rest of the directions are distributed among the other
    directions to add up to the remaining 45%.
     
     
    windrose-sample-report.pdf
  13. Like
    SementhilK reacted to vinhquyen in Internet Time Sever   
    Hello Everybody,
     
    I have a small question
     
    I set up the time in SymphoniePlus3 But when I press "CALL NOW" or receive the second file, the time change. The time is not right when i set up.
     
    It seems the time is updated to Internet Time Server. What can i do to set up the time is correctl?
     
    Thank you
     
    vinhquyen
     
     
  14. Like
    SementhilK reacted to Julia Austin in How do we determine if the data we have collected is valid?   
    Q: How do we determine if the data we have collected is valid?


    A: Comparing two sensors mounted at the same level by taking the difference (or ratio) of the ten-minute average readings is the simplest method. The two sensor readings should track fairly well, but if one sensor is in this vibratory mode, then the difference (or ratio) between the two will diverge. Keep in mind that two sensors at the same level may not track exactly the same due to other factors (e.g. wind regime, mounting configuration, site terrain, etc). The level of scatter should be excessive. If unsure, it is always best to consult a data analysis expert.

  15. Like
    SementhilK reacted to GemmaAllen in Icefree3 sensors   
    Is it possible that your Icefree3 anemometer is affected by the vibratory mode issue?
  16. Like
    SementhilK reacted to Julia Austin in Has this problem been seen on both tubular and lattice towers? Also, has this problem been seen on varying boom lengths/types?   
    Q: Has this problem been seen on both tubular and lattice towers? Also, has this problem been seen on varying boom lengths/types?

    A: We have seen sensor dragging on both tubular and lattice towers, and on booms of various geometries and manufacturers.
  17. Like
    SementhilK reacted to vinhquyen in PIN for coding data   
    Hello All,
     
    Can the logger get specific PIN for coding the data to ensure confidentiality of data (we will change the access pin once the mast has been tested and commissioned on the site)
     
    Thank you,
    vinhquyen
  18. Like
    SementhilK reacted to Aislan in Satellite error   
    Hi

    I'm trying to configure a new satellite iPack, but I got some errors:

    2140 - Pop3_TIMEOUT_ERR

    25110 - GPS_SET_EVT

    2150 - POP3_NOMAME_ERR

    25108 - CALL SUCESS_EVT

    25109 - CALL_FAILED_EVT

    2105 - PPP_ERR

    These errors occured in different moments when thying to performe a "Call Now". I followed an old configuration that I have from another satellite system that is in use in another mast.

    I'm trying to activate two satellite iPacks:

    Customer Modem Reference: EAN8447 - Joca Tavares - Rio Grande do Sul

    IMSI: 901032240084028

    IMEI: 300025010222590

    SIM: 8988169224000840281

    MSISDN/C: 881692497348



    and

    Customer Modem Reference: EAN7539 - Asperezas - Rio Grande do Sul

    IMSI: 901032240084031

    IMEI: 300025010225590

    SIM: 8988169224000840315

    MSISDN/C: 881692497349
    <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

    Can you help me?

    Thanks,

    Aislan Theisen.

     
  19. Like
    SementhilK reacted to Steve_Heidra in NRG #40 anemometers   
    I have just tested two uncalibrated #40 anemometers and a calibrated #40 anemometer in a wind tunnel under identical conditions.  I was really concerned about the results and tried to make contact with NRG with no response as yet.  I tested between 1 and 20 m/s.  Above 5 m/s the results showed reasonable agreement.  Below 5 m/s the new calibrated #40 show significant sticking.  Extrapolating the above 5m/s calibrated results below 5 m/s indicates the uncalibrated #40 anemometers (used for 8 months) showed no noticeable sticking down to 1 m/s, but rather overspeeded by more than 1 m/s.  When used in an MCP analysis for a low wind speed site these results are of a high concern.  COME ON NRG.  We need some answers.  I feel I might as well buy some cheaper product or go for a product which you can trust. 
  20. Like
    SementhilK reacted to techfe in vibration problem in #40 anemometer   
    We have had vibration problems in #40 anemometers (serials 37538,37534,37535 and other 3 of them) all bought in 2007 and 2008. How warranty works?

    Could you please tell me what to do?

     

     
  21. Like
    SementhilK reacted to steve melling in NRG 200 Checking Calibration   
    Hi,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />




    I've had an
    NRG 200 Wind Vane for two years. There are some discrepancies in correlated wind direction
    data and i would like to check the calibration of the instrument on
    decommissioning of the met mast. I see there is some information in the
    documents section of the site, however, if the calibration is out, can i tell
    by how much and then modify my recorded data accordingly?




    Any responses or advice greatly
    appreciated,




    Thanks, 
    Steve
  22. Like
    SementhilK reacted to metmast in troubleshooting of temperature sensor   
    Can somebody advise me how to troubleshoot a temperature sensor of data logger. I already perform the voltage check and the resulting output voltage converted into degrees is within 2 degrees of the reference temperature prob meaning it is still good. I did not perform the current check because of problem with my digital multitester and it is very difficult for it to read a very little amount of current like 300 micro amperes and below. I planning to put the sensor into another slot with its SCM. i hope somebody can help me.Thank you
  23. Like
    SementhilK reacted to Julia Austin in What percentage of returned anemometers has this issue?   
    Q: What percentage of returned anemometers has this issue?


    A: Some customers report no incidences and some customers report higher frequencies of affected anemometers. Based on all of the data and sensors we?ve examined, we estimate that 20%-30% of sensors manufactured after 2006 are affected.
  24. Like
    SementhilK reacted to GeneRisi in Drilling anchor holes in rock   
    How are holes deeper than about 18" drilled in rock? I have not seen impact hammer/drill rock bits much longer than about 18" .
    Thanks!
    Gene Risi

  25. Like
    SementhilK reacted to Julia Austin in Could this problem be found in the non-calibrated #40 anemometers?   
    Q: Could this problem be found in the non-calibrated #40 anemometers? 


    A: Yes, the same vibratory mode could occur in non-calibrated #40?s manufactured in 2006.
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