----- Original Message ----- 
From: "Steve Smith" <xygax@blueyonder.co.uk>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Saturday, January 06, 2007 2:10 PM
Subject: RE: [PIC]: Phase failure detection


> What's the application this has a bearing on how / what and how fast you
> need to sense
> S
>
Its a unit that would be controlling power to a 3 phase water pump. In some 
situations, the wiring would be done for a new installation, which is why I 
would like to detect the right sequence as well as a dead phase.

I would also like to incorporate a feature which tells the unit if the pump 
is drawing too much or too less current (taken from a small coil wrapped 
around one of the phases and fed to an adc pin), and check if the water is 
in fact reaching the destination within a few seconds of the pump supposedly 
starting up.

This is why I would like to use a PIC, rather than go with an analog 
solution.

I dont think the sensing needs to be too fast.

Regards,

Anand


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