Topica Loopframe_Guzzi Archive


Subject: RE: Gen. Woes/ Flash the Field

Author: Keith Ruff

Date: Jun 4, 2001, 4:29 PM

Post ID: 1706988398


Just tried to flash the field and it didn't do squat for me. Looks like
I've gotta go deeper. Thanx to Joe and Greg for the info and
explanations, I really had my hopes up that it would work, but as usual,
"Patience" (the name of my 71 Ambo) doesn't like to take the easy way
out! She prefers the long drawn out and expensive types of fixes!

Keith Ruff
71 Police Amabassador - NJ


Charles Mullendore wrote:
 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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