thank you everyone. I really appreciate the information. I will go check and report back.
Stay safe! Bo On Mon, May 18, 2020 at 8:32 AM Ken Heaton via CnC-List < cnc-list@cnc-list.com> wrote: > Yup, that's correct. If there are only two wires coming from > the paddlewheel transducer, it is likely this 'generator' type as a more > modern hall effect transducer will have at least three wires (I think). > > Of course a broke wire or bad connection anywhere between the transducer > and the instrument will cause it all to not work. We would just pull the > transducer and connect it directly to the back of the instrument to see > what happens. > > From the Troubleshooting section (last page) of the pdf I linked: > > TROUBLESHOOTING > > DISPLAY READS ZERO- The problem could be either the transmitter or the > display. Please follow the proceeding steps to determine cause of the > problem- > > A. Measure the two wires of the transmitter with an ohm meter for > resistance value of approximately 2000 ohms (2K ohms). Do not spin the > paddlewheel. > > a. If unit is good, then check paddlewheel for any broken fins or missing > magnets. > b. If unit is open (infinite resistance) then unit needs replacing. > > B. Measure with an AC voltmeter when the paddlewheel is spinning. You > should get approximately 1.0 VAC at about 5 knots of speed when unloaded > (not hooked up to display). > > INTERMITTENT READINGS- Keep the unit wired as normal and add an AC > voltmeter to where the input wires of the transmitter are connected. Motor > or sail as usual- > > A. If an AC voltage is being produced but no speed indication appears on > display, then the problem is in the display. > B. If readings only occur when voltages are produced, then the paddlewheel > is not always turning. Clean paddlewheel first and be sure it spins freely, > and then try again. If the results are the same then paddlewheel may need > replacing. > > > > > On Mon, 18 May 2020 at 09:18, Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > >> So if I understand it correctly, the theory of operation for these >> generator style knot meters would simply be a 2 wire system and a voltage >> developed between the two? I would expect that a simple initial test would >> be for continuity between the two wires with the wheel stopped. Then spin >> the wheel and check for voltage proportional to the speed of the wheel. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> >> >> On Mon, May 18, 2020, 07:38 Joe Della Barba via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> There are (were) some generator knotmeters. Coquina came with one when >>> we bought her. If memory serves, it topped out at 10 or 12 knots and it >>> was always fun to peg it :) >>> >>> Joe >>> >>> Coquina >>> >>> On 5/18/2020 5:32 AM, Ken Heaton via CnC-List wrote: >>> > Have you looked at this web page? This takes yo to the manuals for SR >>> > Mariner Instruments (since 1973): >>> > https://srinstruments.com/manuals#mariner_manuals >>> > >>> > The only SR Mariner Knotmeter I ever worked on (on a friend's C&C 35 >>> > Mk.I 1973) was self powered. In other words, no external power was >>> > needed (except for the backlight for the instrument face for night >>> > use), the paddle-wheel seemed to be a generator. >>> > >>> > More info here: https://srinstruments.com/r/manuals/public/MANSELF.pdf >>> > >>> > Ken H. >>> > >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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