[DG] [DG11] Autopilot Drops into Standby and other issues

[Derek - Raymarine - Moderator]

Hi Randy,
Thank you for your enquiry.

The dropping to STANDBY symptom is either caused by voltage brownouts - spikes in the power supply or temperature related where the course computer is running hot.

Please check out this FAQ related to Electrical noise and also look at this FAQ regarding constant activity of the drive

You indicate that your batteries are good and you have checked the connections to the computer and the drive, you should not see a voltage drop of more than 0.5 volt when the drive is actually operating under heavy load.

Possibly the drive motor is taking a heavy load, possibly stiff steering or a mechanical issue with the drive?

The issue could also be related to frequency of operation, if the drive is constantly hunting to and fro, the frequent motor reversals will drive current up as well as generate excessive heat in the motor and in the course computer, if the drive FETs in the course computer get too hot they will trigger the computer to shut down. It is also possible there is a fault with the drive FETs inside the course computer and they are breaking down prematurely in which case the computer should be returned to the service workshop.

Regards

Derek