Re: Raymarine s3g ast / st7002 / linear autopilot failure


I had a failure of the Raymarine TYPE 2 Linear drive. It was the clutch that failed. The message was not drivestop.
From the SG# Manual - DRIVESTOP  error:
The autopilot is unable to turn the rudder (this occurs if the weather load on helm is too high, or if the rudder position sensor has passed beyond the preset rudder limits or rudder end-stops). Check drive and rudder position sensor. Check the drive wiring is correctly connected.

That voltage for the motor output is low, but maybe it is low because of resistance in the motor...check with the motor disconnected. 

Maybe a failure of the SG3.

Do you have a spare? Dan Gerhardt <C250@...> can repair SG3.

CW Bill Rouse Amel Owners Yacht School
Address: 720 Winnie, Galveston Island, Texas 77550 
View My Training Calendar

On Tue, Sep 15, 2020 at 3:13 PM Scott SV Tengah <Scott.nguyen@...> wrote:
Hi all, 
We just had our raymarine linear autopilot with the sg3 ast computer fail after working flawlessly for our entire ownership. 
The error on the head unit raymarine st7002 says "Drive stopped". 
The sg3 ast supply is at 26.8v and the clutch is correctly set at 12v and gets around 12.48v
What I do notice is that the voltage at the computer motor output and consequently the linear drive is only 13.4v
I checked all raymarine computer fuses and cleaned the fuse contacts to no avail. 
Has anyone experienced a failure like this or have any idea what I should check? 
2007 A54 #69
SV Tengah

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