Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1
    Join Date
    Mar 2011
    Posts
    54

    Default Raymarine - Bad TWS Reading

    Hello,

    During this winter maintenance I repaired the connection near the mast of the multiwire cable that brings data from the wind transducer. It was the 8 volt wire that was interrupted. My system is a Raymarine SeatalkNG as depicted here:

    http://www.vela-navega.com/forum/viewtopic.php?f=2&t=44

    As soon as I fixed the connection I got wind data again in the instruments. However the boat went to the water 2 weeks ago and I am noticing a strange malfunction. It is erratic. Some times the error appears sometimes it does not. The error is that when wind speed is low the TWS freezes and is precisely equal in value to the Speed Through Water. And, when it happens, the True Wind Angle is exactly the direction from behind the boat. This never happens when TWS is greater than, say, 10 knots. As soon the wind increases it looks like the system works perfectly. I set SOG and STW as the reference to evaluate the TWS but got no difference. Any feedback is much appreciated.

    Regards Luis

  2. #2
    Join Date
    Jun 2004
    Location
    Fareham
    Posts
    6,555

    Default Re: Raymarine - Bad TWS Reading

    Are the wind speed cups still turning when this happens? Sounds like it is reading zero apparent wind so true wind must be equal to boat speed and in the same direction as boat course.

  3. #3
    Join Date
    Mar 2011
    Posts
    54

    Default Re: Raymarine - Bad TWS Reading

    Hello,
    Yes they are turning. I am just sailing from Zakinthos to Kiparissia with COG about 130 degrees with error On. I turned back to 310 degrees and the the reading started to work showing about 9 knots from North.

    Regards and Thanks, Luis

  4. #4
    Join Date
    Sep 2006
    Location
    Oslo, Norway
    Posts
    1,508

    Default Re: Raymarine - Bad TWS Reading

    What does your AWA, AWS and speed (log) look on these courses?

  5. #5
    Join Date
    Mar 2011
    Posts
    54

    Default Re: Raymarine - Bad TWS Reading

    Hello,

    AWA is always right. AWS shows 0 when the error is On. I just measured the voltage at the yellow wire when it reaches the box/pod (that converts to seatalk) and I get a varying voltage of between 3.8 to 4.1 volts which looks compatible (?) with the the apparent wind speed of 3 to 4 knots (what I just got in a time that the error was Off). I need the help of another person to check if the error is On or Off while I measure the voltage (locations are apart). I start to think that the problem is in the Pod. The first one failed after 5 years. This one has 3 years from new.

    Regards and Thanks, Luis

  6. #6
    Join Date
    Sep 2006
    Location
    Oslo, Norway
    Posts
    1,508

    Default Re: Raymarine - Bad TWS Reading

    What type of pod do you have?
    The old pod has gone out of production, according to my sources because they where unreliable.
    it seems that they only sell the ITC-5 today

  7. #7
    Join Date
    Mar 2011
    Posts
    54

    Default Re: Raymarine - Bad TWS Reading

    Hello,

    Yes. When I tried to buy a replacement pod 3 or 4 years ago, only the itc-5 was available. But I got a supplier that had the old pod in stock and I bought it.

    I think that during the next winter I will try to make circuit to convert the analogue voltages from the wind sensor into SeatalkNG data.

    Regards Luis

  8. #8
    Join Date
    Mar 2011
    Posts
    54

    Default Re: Raymarine - Bad TWS Reading

    Hello,

    I am convinced that I have to replace the cable that brings data from the wind transducer to the base of the mast.

    Today my wife was looking to the chartplotter showing AWS = 0 while I was in a odd position near the wind pod measuring the "speed voltage". It was almost constant equal to 4V.

    Then I went to the mast base and when I was gently pulling the several cables that come out at the base (radar, antenna, lights,..) my wife shouted - "it is not zero!". I returned to the pod and now the voltage was clearly varying between 2 and 3 volts.

    The cable was accidentally cut in the past near the base of the mast and my repairs with soldering and tube shrinking seem not to work. If someone knows the exact cable reference I would be grateful to know.

    Regards and Thanks, Luis

  9. #9
    Join Date
    Jun 2004
    Location
    Fareham
    Posts
    6,555

    Default Re: Raymarine - Bad TWS Reading

    I think you will find that the cable is moulded into the block at the top of the mast so you won't be able to re-wire it completely. But if you can cut it back to undamaged cable it should be easy enough to repair with solder and heat-shrink. After all the joint at the mast base is made with simple terminal blocks.

  10. #10
    Join Date
    Mar 2011
    Posts
    54

    Default Re: Raymarine - Bad TWS Reading

    Hello,

    Thank you for that important information. The original cable when I pull it out at the Base of the mast comes out about 20 cm which is a small length to make a proper joint. Could I pull it out from the top of mast (with a guide line for reinserting) and make a good and solid join with an extra length of cable and then pull the guide line to place the cable again inside the mast? Or the moulding to the block that you refer to does not allow me to follow that approach?

    Thanks, Luis

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Latest YBW News

Find Boats For Sale

to
to