Re: votage reg. + polarizing

Posted by Janicholson on June 22, 2007 at 07:17:59 from (66.173.50.90):

In Reply to: votage reg. + polarizing posted by KD on June 22, 2007 at 06:46:51:

Voltage regulators can be affected by incorrect installation/polarization if they have any solid state components (A diode or two, or are modernixed hybred transistor/relay units). Some are less sensitive to reversed connections. The other ingredient is if they were cooked from the leads being connected wrong and current flowing through the wrong contacts, or windings.

I would take the cover off and as it comes off, I would smell for the pungent burnt motor smell of overheating. I would look for toast colored coils, and contacts welded together. If I found none of these, I would try to use it.

Polarizing one of these systems just passes normal current through the field windings (and armature as well, but not intentionally) This field current causes the field iron poles to become correctly magnitized North/South. It is done by momentarily connecting the lead going to the Amp meter to the lead going to the big terminal on the GEN. These are ususlly labeled BAT and GEN (or ARM) on the VR terminals. The Field (F) terminal must be connected to the VR when this happens, and the battery must be charged up, and the VR unit must be grounded (as it is when attached to the tractor thrugh its mount). The small spark that happens when this "polarizing" takes place indicates that current is passing through the generator (hopefully both the field to polarize it, and the armature incedentally).

The VR (in this system) provides a ground for the field circuit. Thus when operating, the field gets "powered" by the armature connection, and grounded by the VR. The VR then adjusts the resistance in the field by viabrating contacts, and built in wire wound resistors, to keep the voltage constant. The Cutout relay in the VR (bigger contacts) disconnects the Gen from the BAT when the tractor is shut off to keep the battery from going dead. I hope this helps, John T and BobM have additionsl Info stored here on Gen systems. They are also well versed in the system. Look up polarizing in Search For above, and gain tremendous info. JimN

Replies:

• Re: votage reg. + polarizing John T 07:57:22 06/22/07 (0)

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