Posted by John T on April 14, 2015 at 19:29:21 from (216.249.74.3):
In Reply to: Polarize the system posted by ILB on April 14, 2015 at 16:34:18:
Yall, we need to get back to engineering basics of what Polarization is and how its accomplished:
1) To Polarize you pass current through the field windings and creation of the electromagnetic field that is then generated imparts a degree of residual permanent type (NOT electromagnetic) magnetism into the soft iron field poles, ie you're magnetizing the iron when current flows through the field windings.
2) You polarize an A circuit (most tractors other then some Fords and some Masseys and a few others) by jumping off the VR or cutout relays BAT terminal over to the A terminal so hot battery voltage present on BAT causes current to flow through the field windings (on a 2 brush A genny the fields begin at the A post and end at the external F post) since the gennys external F terminal is grounded via the voltage regulator which gives F its ground path.
3) You polarize a B circuit (some Fords and Masseys and a few others) by applying hot battery voltage (such as present on a VR's BAT A terminal) to the external F terminal so current flows through the fields to ground as the other end of the fields is internally grounded. NOTE on a B circuit if you apply voltage to the A terminal, current flows through the armature to ground but NOT through the field windings IE NO POLARIZATION!!! The fields on a TWO BRUSH B start at the external F terminal then to the internal ground with no connection to A other then the armature as well as one end of the fields are both grounded.
DISCLAIMER I did this in a hurry I may be incorrect, but as I recall on a two brush genny on a B system the fields are between the external insulated F post and an internal ground with no connection to the armature circuit, the B armature circuit is between the hot ungrounded brush which wires to the external A post and the other brush which is grounded so applying voltage from BAT to A DOES NOT cause field current to flow (like it would on an A system) which is necessary to polarize the soft iron field poles. ISNT THAT CORRECT PROFESSOR JIM??????????????????????????????????????????????
Jim already posted my Troubleshooting Procedure but its ONLY for a Class A system NOT a B
I think the above is correct and Im stickin to until proven otherwise
SUMMARY Polarize an A system by jumping from BAT to A (current flows through fields then to ground via the VR) Polarize a B system by jumping from BAT to F (current flows through fields which are between F and internal gnd)
What say other sparkies??????????????????????????????????????
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.