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Re: Crowbar installation

Subject: Re: Crowbar installation
From: Fred Fillinger <fillinger@ameritech.net>
Date: Thu, 16 Jan 2003 10:49:43
William Mills wrote:
> 
> but when I subsequently investigated the problem I saw that the 
> 22,000uf capacitor had blown leaving fluid and soot everywhere.

I wouldn't discount the possibility that the electrolytic capacitor
itself was the problem, or a concurrent one.  Neither Rotax nor Europa
state what quality this thing should be, and infant mortality is a
possibility.  The waveform it has to contend with is not what many
such caps are designed for, and installing it in a hot, vibrating
engine compartment doesn't help either, if one reads typcial mfr's
Application Notes. Add'l capacitance will do hardly anything and even
hurt, but derating it to 35-40 volts is extra insurance.

Regards,
Fred F.


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