Autohelm ST50 speed instrument
Posted: Fri 31 May 13, 8:56
After winter storage my speed log does not work anymore. Power is on and timer etc. are working but the speed shows zero.
I have checked the impeller is rotating and also disconnected and connected again all connectors.
I could not find a proper connection diagrams from net. Here is the manual, but it does not help at all.
http://www.raymarine.com/view/?id=1964& ... 3&col=3458
Any tips? Is there some electronics inside the tranducer? Is the output a pulse train or analog voltage/current? 0-10V, 0-20mA or 4-20mA?
I know this is an ancient system, but I do not want to upgrade all instruments at this point.
I have checked the impeller is rotating and also disconnected and connected again all connectors.
I could not find a proper connection diagrams from net. Here is the manual, but it does not help at all.
http://www.raymarine.com/view/?id=1964& ... 3&col=3458
Any tips? Is there some electronics inside the tranducer? Is the output a pulse train or analog voltage/current? 0-10V, 0-20mA or 4-20mA?
I know this is an ancient system, but I do not want to upgrade all instruments at this point.