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[TG11] Analogue Wind Display instability with rotation sensor
11-01-19, 07:51 PM (This post was last modified: 11-07-19 03:27 PM by Chuck - Raymarine - Moderator.)
Post: #1
[TG11] Analogue Wind Display instability with rotation sensor
Dear Raymarine,

my Micronet analogue wind display (T112) flips the wind direction needle 180 degrees frequently, but only when the apparent wind is ahead of the beam. It does so on either tack. This creates havoc with the autopilot in wind vane mode.

My system includes:
T120 wind transmitter (2011 vintage)
T112 analogue wind display (new)
T111 dual digital display (new)
T030 entry-level single digital display (2011 vintage)
T221 mast rotation sensor (new)
T121 hull transmitter (new)
Compass Hull transducer (CHT) (new)
T122 wireless transmitter (new)
(connected to T122) Actisense NMEA 0183 to NMEA 2000 converter with SeatalkNG adapter (new)
EV-1 solid state gyro (new)
AC-100 autopilot actuator with tiller pilot drive (new)
p70s autopilot control head (new)

The only potential solutions I can think of are:
-reverse CHT 180 degrees and recalibrate.
-renew T120 (expensive, I'd rather not have to do that, especially as I've just replaced the anemometer bearing)

Is it possible that the T112 is flipping between boat heading inputs (between the CHT input and the EV-1 input), possibly because one of them is dropping in and out?

Solutions or at least suggestions would be very welcome. More detail on my setup saga is available in the thread "Rotating mast, Tacktick wireless and EV-100" in the "Autopilots" forum.

Regards,
Nick
F-32 "Amazon"
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11-07-19, 06:46 PM
Post: #2
RE: [TG11] Analogue Wind Display instability with rotation sensor
Hello Nick,

Is it apparent wind that you're looking at, or true?
When the problem occurs, what happens with the wind angle afterwards? Still indicates a shifting wind angle but inverted, or static wind angle, or something else?

The mast rotation calculations will only use heading data from the fluxgate connected to the Hull Transmitter, not the EV, so I don't expect that the system is toggling between these two heading sources. What I think is more likely is either that:
  • you are looking at True wind and your speed-through-water paddlewheel is sticking occasionally, which will of course corrupt the results of the TWA calculation
  • you have a broken winding in your fluxgate compass which is occasionally giving incorrect heading data into the mast rotation calculations.

Next time the problem occurs, I would suggest:
  • unplugging the link between STNG and the Wireless system, just as a precaution (this is also needed for the next step)
  • checking what heading data is displayed on the Wireless system - is this broadly accurate, is it static, does it change smoothly and evenly as the vessel turns?
  • checking your STW data: is this accurate and changing, not static or zero?

Regards,
Tom

Raymarine since 1999.
Interests: Diagnosis of problems in sonar/fishfinders, NMEA2000, ethernet comms, autopilots, thermal cameras
Location: Sydney, Australia.

Please don't PM me asking for direct support, please ask a public question instead so that others can see the question and answer. Forum posts will always be answered before PM requests.
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