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Old 04-03-2022, 11:07   #1
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ST60 illumination switches off

I have 4 RM ST60 instruments linked in a row.
At night I use the wind instrument to switch on the lights to level 3 on the depth and speed units. After about 10 minutes they all go to a reduced level.
They will not stay at a higher level.
If I turn them on individually the result is the same.
Any ideas?
Thanks
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Old 04-03-2022, 20:00   #2
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Re: ST60 illumination switches off

The ST60 system is nearly 30 years old. The fact that yours still work and illuminate is a testament to Autohelm’s superior work in early marine digital data acquisition and display. My ST60 system won’t illuminate if only one display is used to try to control the others - I have to illuminate each display individually.
That small effort beats dropping several boat bucks on a new set of data displays.
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Old 05-03-2022, 13:56   #3
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Re: ST60 illumination switches off

Quote:
Originally Posted by Wainui View Post
I have 4 RM ST60 instruments linked in a row.
At night I use the wind instrument to switch on the lights to level 3 on the depth and speed units. After about 10 minutes they all go to a reduced level.
They will not stay at a higher level.
If I turn them on individually the result is the same.
Any ideas?
Thanks
It seems to me that it is a problem of corrosion of the cables or in the Seatalk connectors.

You can parse these two things:
- There may be a data error due to this problem, but in that case, you would appreciate some more deficiency in the visualization.
- With a multimeter, check the 12v voltage level (red - black of the Seatalk network), just at the Seatalk output of the AP, and at the farthest point from the pilot, and compare that value when the LEDs are on and off .

If there is any connector with corrosion / rust, a high resistance is created at that point. When the current demand is increased by lighting, the voltage drops from that point on the network, and the instruments may automatically reduce the lighting level to compensate.

In this case, the solution is to clean the contact very well, apply WD40, and protect with a little grease to prevent moisture from entering.
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Old 05-03-2022, 15:15   #4
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ST60 illumination switches off

Most unlikely to be a communications issue. The light wouldn’t work at all ifthat was the issue.

The st60 isn’t smart enough to reduce lighting as you state.
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