It's the controller - and yes it just starts ramping down the amperage to cool off, but that can happen at inopportune times. I added a fan today and that helps - I've got a Sevcon PMAC mounted on 3/8 alum plate which in turn has a heatsink - all connected with that gooey thermal grease. I have a spot infrared sensor and it was showing about 200F on the face of the controller when it went into shutdown.
I think the 'sensor' on my motor overheating is molten copper being thrown about ;) (it's the Mars brushless)
And BTW...it wasn't all seriousness today - after I got some good work done I went out and had one of the best sails I've had in months! T-shirt & shorts in 15kts steady (a far cry from last weekend)
-K
--- In electricboats@yahoogroups.com, James Massey <jcmassey@...> wrote:
>
> G'day Keith, All
>
> At 04:02 AM 30/05/2010, Keith wrote:
> >We've lost 3 good sailors here in CA recently, so I'm spending the
> >weekend upgrading my safety profile. <snip>
> >I still can't sustain > 60amps without overheating, so that's a concern.
>
> Which component/components can't sustain 60 amps? I'd assume only the
> controller or motor could overheat and tell you (anything else would
> just melt down and stop)?
>
> Care to give a basic system description, or do you already have it in
> hand? (If you have it in hand already, please describe your mods).
>
> A controller usually just goes into a shut-down mode, but motors are
> often suffering by the time their thermal switch comes on, so if it's
> the motor you'll probably want to do something about it soon.
>
> What are the options to add cooling?
>
> Regards
>
> [Technik] James
>
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