ST50 wind instrument plugs

[sgr143]

I've been struggling to get this ST50 working for some time. Last year, it would read speed OK but not direction. I suspect one of the cos or sine lines has a break in between masthead and gauge-head. I've now removed the MHU and gauge-head from the boat and back home, reckoning if I can get the system working OK on the benchtop I can work backwards from there. That will mean fitting up suitable MHU-gauge and gauge-power cables.

Does anyone know if plugs and sockets that will fit the sockets and plugs on the Raymarine cable ends can be bought from , e.g. RS, so I can make up cables, and if so, what part numbers? The RS catalogue is so huge that I just get lost and confused!

thanks - Steve

 

[RichardS]

I believe that the ST50 MHU uses the same 240 degree DIN plug as the ST60. I bought mine a couple of months ago and used in to test my MHU.

http://www.ybw.com/forums/showthread.php?503812-Which-Raymarine-Wind-MHU-in-photo&highlight=ST60+MHU

I'll look up which socket it was and add it.

It's a 5 pin DIN type B 240 degree pin spread audio connector socket. I think I bought mine online from CPC.

In my case it was the circuit board inside which had failed on one signal: http://www.ybw.com/forums/showthrea...-refurb-problem-with-photo&highlight=ST60+MHU

Richard

 

[sgr143]

Thanks Richard - let me know what you find about the socket. Do you know what is needed for the gauge-head connections - the 5-pin end of the MHU cable and the 3-pin Seatalk connector?
Steve

 

[RichardS]

Thanks Richard - let me know what you find about the socket. Do you know what is needed for the gauge-head connections - the 5-pin end of the MHU cable and the 3-pin Seatalk connector?
Steve

I've added the socket to my email above. I bought a metre of 5-core signal cable to solder to it at the same time.

My ST60 wind instrument needs all 5 cables from the MHU to be connected to show both wind speed and direction and to supply the 8V DC needed for the MHU. I didn't use he gauge but just used a battery on the bench at home to provide 8V and read the outputs with a multimeter.

The connectors on the back of the instrument are standard 3.2mm spade connectors. The 3 pin Seatalk connector is also just three 3.2mm spades which you can just crimp on if you don't have the proper connector.

Richard

 

[RichardS]

Actually I've mis-remebered that and the Seatalk pins are 3.2mm (1/8 inch) spades rather than 2.8mm.

Post edited above.

Richard

 

[sgr143]

Actually I've mis-remebered that and the Seatalk pins are 3.2mm (1/8 inch) spades rather than 2.8mm.

Got it! Thank you, Richard.
Steve

 

[awol]

ST50 use 3-pin connectors, +, - and Seatalk. I check polarity on the boat and just push wires into the female one.

 

[sgr143]

This is the connection to the gauge head - when the power is turned on, I get +12V at the right hand pin, with either of the two other pins as ground. It would be good to know which of those two is genuinely ground (battery -ve) and which is the data carrier, so I can wire up the gauge head on my workbench without risking blowing it up... Does anyone know which is which? (As I type this I realise I should just do a continuity test on each pin back to the battery. Doh.... - I'll report back.)
Steve

 

[FulmarJeddo]

When I bought my current boat my wind speed was intermittent and direction all over the place. The wind vane had been caught by the crane and was broken. After replacing the vane, that too became intermitant. I eventually tracked the problem down to the screening on the cable being damaged at the foot of the mast and pushed back in the mast to protect it (or hide it). Once strapped over the break and insulated, it has worked since. Now with a ST60 display as the ST50 wouldn't retain its calibration.