Autopilot saga continues...

[sfellows]

Our old Mamba autopilot saga continues. We've had the unit repaired and it works on the bench. But on connecting to the NAC3 computer, whilst the clutch now engages the drive refuses to work. I've subsequently found out that a reset was done to the NAC3 system during our failure to get it working before the repair and it's possible it's the NAC3 configuration that needs re-setting. I've changed a number of settings but it still refuses to work (actually changing the course direction moves the wheel VERY slightly but nothing like it used to).

Settings amended to

Nominal Voltage is set to 24V (we have a 24v boat)
Computer = NAC3 with virtual rudder
Rudder CFG to 45 degrees starboard and Port.

Am I missing something?

 

[RunAgroundHard]

Check the commutator. slip ring and brushes and clean them thoroughly. I had my motor (a Necol) rewired to work with Raymarine ACU400 and it bench tested satisfactory at Hudson Marine. When I installed it, it worked and got pregressivly worse, similar symptoms. Eventually, someone at Raymarine suggested cleaning the brushes and slip ring. I did this and perfect operation since.

I think the nature of these motors, clockwise, anticlockwise quick movements, sudden changes in direction loads the slips rings with carbon dust, then the damp air helps to smudge the dust. Just a thought.

Anyway, clean the slip ring, brushes and don't assume that the workshop did that.

 

[sfellows]

Thanks for the reply, but this has all been done as part of the initial repair - which is why I think it’s CFG related.