Dielectric grease is made specifically for electrical use. Any auto
parts store has it for about $5.
Joe
Coquina
On 5/23/2020 12:54 PM, General Gao via CnC-List wrote:
that is what I am thinking. Would vaseline work?
Thank you,
Bo
On Mon, May 18, 2020 at 3:49 PM Della Barba, Joe via CnC-List
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
Put some dielectric grease on the connections ;)
*/Joe Della Barba Coquina C&C 35 MK I/*
*/www.dellabarba.com <http://www.dellabarba.com>/*
*From:*CnC-List [mailto:cnc-list-boun...@cnc-list.com
<mailto:cnc-list-boun...@cnc-list.com>] *On Behalf Of *General Gao
via CnC-List
*Sent:* Monday, May 18, 2020 3:41 PM
*To:* cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
*Cc:* General Gao <general.z....@gmail.com
<mailto:general.z....@gmail.com>>
*Subject:* [EXTERNAL] Re: Stus-List speedometer - C&C 35 Mk2
Reporting back. followed the guide and verified the transmitter
had resistance of 1787ohms, verified there was VAC output when the
paddle was turning fast (couldn't get to the 5knots as boat is on
land). Decided to sand the connectors, and put it back, tested
again, and it worked...the connectors looked without rust, a bit
surprised.
Thank you everyone for the kind help!
Stay safe, stay healthy.
Regards,
Bo
On Mon, May 18, 2020 at 11:42 AM General Gao
<general.z....@gmail.com <mailto:general.z....@gmail.com>> wrote:
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 <mailto: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 <mailto: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
<mailto: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
<https://protect2.fireeye.com/v1/url?k=8594dd2f-d8e74e4e-8594f458-ac1f6b44e86e-dd5873740a9ca4d3&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fmanuals%23mariner_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
<https://protect2.fireeye.com/v1/url?k=02beb11d-5fcd227c-02be986a-ac1f6b44e86e-410501274e5fda22&q=1&e=efdd7465-d92c-4c80-83ec-908c6edcb26a&u=https%3A%2F%2Fsrinstruments.com%2Fr%2Fmanuals%2Fpublic%2FMANSELF.pdf>
>
> Ken H.
>
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contributions. Each and every one is greatly
appreciated. If you want to support the list - use PayPal
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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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every one is greatly appreciated. If you want to support the list - use PayPal
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