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Regulator Confusion

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keithtraffic:
I have had some charging problems (which I won't go into here) but was reading the Workshop Manual about the charging system and specifically how the regulator works. However, given the circuit diagram I cannot see how it can possibly work as described.

I felt sure I had seem a full description of the operation on the forum somewhere (and it was slightly different to the workshop manual), but despite several searches I can't seem to locate it now.

Does anyone know if there is one and could they point me at it please.

AshimotoK0:
Been meaning to put this on here for a bit .... here goes  :)

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Oggie400F:
Great info Ash
Is this going into Aladdin’s Cave if it’s not already?

AshimotoK0:

--- Quote from: Oggie400F on July 31, 2020, 06:06:55 PM ---Great info Ash
Is this going into Aladdin’s Cave if it’s not already?

--- End quote ---

Yes will do it now .

keithtraffic:
Thanks Ash - this description confirms what I had deduced and found from testing the regulator with an accurate power supply and is definitely different from what is described in the Workshop Manual . The really subtle point is that in Mode 2 the relay armature is in the middle of the two contacts and it is that which selects the higher resistance to the Field coil - this is completely missed in the manual!

But I still can't see the logic, in Mode 3, of the regulator sticking the 10ohm resistor straight across the battery - apart from being rather wasteful the resistor gets incredibly hot as its dissipating nearly 20W - and there's plenty of other load to discharge the battery to bring its voltage back down a bit.

From a purely Engineering standpoint the design does seem rather flaky - simply relying on the regulator armature just sitting in the middle position to optimally regulate the battery charging but I guess its relatively simple and low cost.

Has anyone come up with an electronic version that mimics the regulator operation, giving proper control of the Field current - it seems to be a simple thing to do with a couple of FETs and a dual op-amp and it would be highly accurate!

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