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??????????????????????????????????????
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