Author Topic: VP2 Anemometer  (Read 848 times)

0 Members and 1 Guest are viewing this topic.

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
VP2 Anemometer
« on: May 05, 2020, 05:14:12 AM »
My anemometer has started not working over night in regards to wind direction?. The wind speed is working
properly but not the wind direction.
Has anyone got any idea what would be causing the wind direction to fail at night it just freezes at NNW 335
I have re-calibrated the anemometer 25 to the west as I am unable to site the anemometer arm to true north.
It started  recording the wind direction at about 10C between 9 and 10am today and stopped giving the wind direction at about 5pm today while the outside temperature was 12C.

Offline miraculon

  • Sunrise Side Weather
  • Forecaster
  • *****
  • Posts: 3599
  • KE8DAF
    • Sunrise Side Weather in Rogers City MI USA
Re: VP2 Anemometer
« Reply #1 on: May 05, 2020, 10:25:51 AM »
Is this anemometer connected to an ISS, or to a 6332 Anemometer Transmitter?

If ISS, are the other sensors working all night?

Does NNW 335 correspond to the mechanical "N" direction of the windset arm?

If there is an electrical problem with the wind set wiring that affects the direction, it typically will go to North.

See this guide for troubleshooting advice: http://www.wxforum.net/wxtech/Anemometer-Vane.htm

Note these items:

Quote
Wiring errors:
yellow wire open causes a north indication
green wire open causes a north indication
red wire open causes a north indication and prevents wind speed from being indicated
black wire open prevents wind speed to be indicated
yellow to green shorted causes a north indication
yellow to red shorted causes a north indication
green to red shorted causes a north indication
black to yellow shorted, wind speed zero
black to green shorted, wind speed zero and direction erratic
black to red shorted, wind speed zero, intermittent short causes wind speed error

Greg H.


Blitzortung Stations #706 and #1682
CoCoRaHS: MI-PI-1
CWOP: CW4114 and KE8DAF-13
WU: KMIROGER7
Amateur Radio Callsign: KE8DAF

Offline Mattk

  • Forecaster
  • *****
  • Posts: 1374
Re: VP2 Anemometer
« Reply #2 on: May 05, 2020, 07:34:27 PM »
Sounds more like a short or moisture affecting the wind direction circuit?

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #3 on: May 06, 2020, 12:13:52 AM »
My ISS is wireless version and the wind cable is connected by a plug into the SIM transmission box.
Yes everything else is working overnight including the wind speed.
There could be a problem here in regards to my re-calibration from 360 to 335 as I did not check or have the vane
pointing north at setting up of my ISS in the first place in October 2017.

Do not forget this is happening only over night. lately it is happening when the UV sensor is in 0.0 index position as we are not far from the shortest day or winter. The wind direction is working fine now as it is day time.
But I bet when the UV sensor index goes to 0.0 index the wind direction would have stopped working again?.

Also if it is a wiring fault why would the wiring be effected only at night and not during the day?.

Offline CW2274

  • Forecaster
  • *****
  • Posts: 5358
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: VP2 Anemometer
« Reply #4 on: May 06, 2020, 12:52:10 AM »
Is it reasonably easy for you to bring the anemometer down so you can "fiddle" with it while simultaneously looking at your console? You need to start trouble shooting and the anny vane itself is the place to start.

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #5 on: May 07, 2020, 02:22:01 AM »
The way I have the outside part of my ISS installed on the fence it is not easy to bring the anemometer down
without assistance from my next door neighbour, who has tools that are needed plus a ladder.
As you might have gathered I am not a DIY type person, I would rather pay someone skilled in this area like an
electrician who could check out the wiring to see why  it is only effected at night time.

As it is night time problem I do not see what difference re-calibrating the anemometer would have in fixing the
problem I am having?. 

Offline CW2274

  • Forecaster
  • *****
  • Posts: 5358
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: VP2 Anemometer
« Reply #6 on: May 07, 2020, 03:53:51 AM »
I do not see what difference re-calibrating the anemometer would have in fixing the problem I am having?.
Yeah, that's not it.

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #7 on: May 07, 2020, 08:47:21 AM »
After talking to a friend about this he has suggested that it could be power problem.
As I have to have the SIM transmission box facing to my yard which is facing away from the sun so I have access
to the SIM box for maintenance, which is possibly causing a lack of power so its not getting enough power from the sun to run all the ISS sensors at night. Not that we get much sun this time of the year anyway.

My friend suggested contacting Davis Instruments to see if my wireless version can be converted to a cabled
version. But before permanently installing test to see if this fixes the problem?.

Online johnd

  • Forecaster
  • *****
  • Posts: 3614
    • www.weatherstations.co.uk
Re: VP2 Anemometer
« Reply #8 on: May 07, 2020, 09:50:51 AM »
If it was a low SIM battery or eg a pending supercap issue (which I think is what you're suggesting) then it would affect all sensor readings equally. So if ALL readings except wind direction are updating correctly then it's not a 'power' issue.

The most likely alternative cause of wind direction issues overnight (as has already been suggested) is either dew/moisture getting into the cable/plug etc somehow or possibly a temperature-dependent issue in SIM board or anemometer - I'd suspect the latter, but impossible to know for sure until you swap out the part.
Prodata Weather Systems
Prodata's dedicated Davis EnviroMonitor website
UK Davis Premier Dealer - All Davis stations, accessories and spares
Littleport, Ely, Cambs UK

Offline Mattk

  • Forecaster
  • *****
  • Posts: 1374
Re: VP2 Anemometer
« Reply #9 on: May 07, 2020, 04:49:35 PM »
Based on the description of the problem this issue would exist be it a wireless or cabled system, this wouldn't be a conversion but a complete replacement and don't see any purpose in doing this.

One way to check if it is a power issue (which it probably isn't) is to run the ISS direct on DC power, 4.5-6volts using a 2.1mm DC plug, however I doubt this will change anything?

Doubt this will fix the issue either but you could try replacing the modular 6P4C plug, however from all comments it does appear environmental related (humidity, temp, dew point etc?). Also simple enough to remove the wind vane, especially if a "D" shaft version and check for moisture etc

Offline CW2274

  • Forecaster
  • *****
  • Posts: 5358
    • Conditions @ CW2274 West Tucson-Painted Hills Ranch
Re: VP2 Anemometer
« Reply #10 on: May 07, 2020, 05:08:42 PM »
Also simple enough to remove the wind vane, especially if a "D" shaft version and check for moisture etc
Yep. This would be the first thing I'd do and give it a good CRC cleaning. Probably won't help, but gotta start somewhere.

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #11 on: May 11, 2020, 08:42:44 AM »
I had to get an electrician to install a new light for my living room, so thought I would ask him to fit a new RJ/11 plug to the wind cable which he did, but as he said he thought that this would not fix my problem, as it turned out the electrician was  correct. The people at Davis Australia asked me, did you make sure that the reverse polarity was matched?. What ever that means?.

Offline miraculon

  • Sunrise Side Weather
  • Forecaster
  • *****
  • Posts: 3599
  • KE8DAF
    • Sunrise Side Weather in Rogers City MI USA
Re: VP2 Anemometer
« Reply #12 on: May 11, 2020, 08:57:45 AM »
Quote
The people at Davis Australia asked me, did you make sure that the reverse polarity was matched?. What ever that means?

Davis uses a "straight through" pinout for their cables. Telephone wires reverse them at one end. This is why you can't use a telephone cable in lieu of the correct one.

See my previous post regarding rain gauge connections here: https://www.wxforum.net/index.php?topic=39042.msg401460#msg401460 The same issue exists for the anemometer.

Greg H.


Blitzortung Stations #706 and #1682
CoCoRaHS: MI-PI-1
CWOP: CW4114 and KE8DAF-13
WU: KMIROGER7
Amateur Radio Callsign: KE8DAF

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #13 on: May 11, 2020, 08:22:49 PM »
I am sorry but that is as clear as mud to me, as I am not an electrician.
Would a new anemometer fix this problem it seems I am unable to solve?.
Would it fix this reverse polarity thing that Davis is speaking of?.
The wind direction is working now as the temperature is above 14C at 16C  at the moment  at 10.20am

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #14 on: May 23, 2020, 08:17:34 AM »
A more curious thing has happened in the last 2 days.
If the temperature now drops below 12C it is starting to record the wind direction and last night when the low was down to 2C which is pretty low for us in this island state of Tasmania.
I could not believe my eyes when the anemometer was still recording the wind direction.
When I went to bed last night about midnight the outside temperature was down to 3C and it was still recording the wind direction then. We had light frost over night. But the winds were very light flicking between 0 and 1mph.
At the moment the temp. is down to 8C at 10pm. forecast low is 7C and it is still recording the direction.
I cannot explain this complete turn-around.
I have ordered and paid for a new anemometer from Davis Australia hoping that would fix the problem, but they are out of stock at the moment and do not expect a new shipment until about the middle of June this year.
Will be interesting to see if it records the direction during the day tomorrow?.

Offline Mattk

  • Forecaster
  • *****
  • Posts: 1374
Re: VP2 Anemometer
« Reply #15 on: May 23, 2020, 07:27:11 PM »
Would a new anemometer fix this problem it seems I am unable to solve?.
Possibility?

Quote
Would it fix this reverse polarity thing that Davis is speaking of?
You mean the way the electrician may have fitted the modular connector? Only if the electrician fitted it the wrong way around.

You can check this by looking that the modular plug, with the flat anemometer cable held in front of you and the tab/lock of the plug on the underside as you hold it, the Black wire should be on the right, with the colours to the left being Yellow, Green, Red, Black, in that order to the left
   

Offline Mattk

  • Forecaster
  • *****
  • Posts: 1374
Re: VP2 Anemometer
« Reply #16 on: May 23, 2020, 07:29:50 PM »
The thing you are seeing with low temperature is not really related to the temperature but more like Humidity, Dew point which are related to temperature. Take more notice of the humidity and dew point when the wind data changes

Online johnd

  • Forecaster
  • *****
  • Posts: 3614
    • www.weatherstations.co.uk
Re: VP2 Anemometer
« Reply #17 on: May 24, 2020, 03:31:56 AM »
Would a new anemometer fix this problem it seems I am unable to solve?.

Probably, but no-one can tell for sure in advance. This sounds like an odd and unusual issue that doesn't have any well-known or easily-pinpointed cause, and which as mattk suggests isn't helped by the fact that it doesn't seem to happen continuously but only under conditions of higher humidity.

There are some missing pieces to this fault report. Eg where are you seeing that the wind direction freezes - on the console display or on software. What sort of wind speed readings are you seeing when the direction freezes - presumably they are non-zero readings? And I can't help wondering whether the direction offset is a factor - what happens if you remove the offset - is the issue still there, albeit perhaps freezing at a different direction?

But other than these points and assuming that the cable and plug check out OK then there are only two possible causes - a faulty wind direction pot in the anemometer or some faulty circuitry on the wind input of the SIM board. Neither of these can be easily fixed as a repair by a general user and the only pragmatic solution is a replacement part, starting with the anemometer since that's the more likely to be at fault.

Prodata Weather Systems
Prodata's dedicated Davis EnviroMonitor website
UK Davis Premier Dealer - All Davis stations, accessories and spares
Littleport, Ely, Cambs UK

Offline raldridge

  • Member
  • *
  • Posts: 37
    • Glenorchy
Re: VP2 Anemometer
« Reply #18 on: May 24, 2020, 04:10:16 AM »
Well further to my last message the anemometer is still displaying wind direction and seems now to be doing  this all the time. How this happened I do not know it just started working by itself as I have not touched it in weeks.
The humidity outside has just now gone from 80% to 81%. The high humidity does not seem to bother it now.

Will be interesting to see what happens when it rains?. The barometer is fairly high at present at 3026 inches in the
dry area, so not much chance of rain for a while?.
As I think I informed you I had a new SIM box installed weeks ago and an electrician crimped a new plug on the end
wind cable, so whether this made any difference I do know, if it did it took a long time to work properly after this.

It started working about 3 days ago when it was a very cold night, this might have made it work.
If so what will happen in the summer when we get very hot dry weather again?. 

 

anything