Topica Loopframe_Guzzi Archive
 

Subject: Re: Gen. Woes/ Flash the Field

Author: Charles Mullendore

Date: Jun 4, 2001, 3:29 PM

Post ID: 1706987773

Hi All,
I've done the same procedure for the same problem on a Montgomery Wards
(Benelli) 350 I had years ago. The bike had sat unused for approx. 15 years and
only had 1400 miles on it. Charged just fine afterwards! Cheers,

Charlie
3 Ambos (the old '69 is raring to go to WNY)

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Thanks for the explanation. Makes sense.
Chris in NC

 From: joe jump <jum-@hotmail.com>
Reply-To: Loopfram-@topica.com
To: Loopfram-@topica.com
Subject: RE:Gen. Woes/ Flash the Field
Date: Mon, 04 Jun 2001 16:49:22

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The question was asked about flashing the field on a generator.

This is done to rejuvenate a residual magnetism in the field coils. This
residual magnetism is required to "get the snowball rollin' down the hill".
This magnetism starts the generator making current, which after a point
will
be high enough to close a set of points in the regulator that supplies
battery current to the field coils, which in turn increases the magnetic
field, causing more current to be generated in the rotating armature.
Without the residual magnetism, the cycle doesn't get started and results
in
no output. The residual stays in place unless something disrupts it, like a
sharp blow (drop), or perhaps disassembly-changing the field windings, or
long periods of non-use. Generally it hangs in there.
Flashing the field re-establishes the residual magnetism, just like
magnetizing a screwdriver or a nail. You flash by crossing the BAT terminal
on the regulator to the DF (field?) terminal just momentairily with a
jumper
wire.


 
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