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cleone(at)rr1.net
Guest

Posted: Sat Dec 02, 2006 1:12 pm Post subject: Questions??

Hi Bob,  In the John Deere alternator and regulator frequently talked 

about here is the rectifier in the regulator?  And,   Is the 

alternator generating 3 phase AC ? And, about what voltage is the 

output of the alternator.  Also, since we know that the # 5 terminal 

must be connected to voltage or the alternator doesn't work.  I have 

tried this and it is true.  Then what is the circuit like?  And would 

it be a good place to connect the overvoltage crowbar to?  Enjoyed 

your lectures at Bloomington recently.  Cleone

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klehman(at)albedo.net
Guest

Posted: Sat Dec 02, 2006 3:24 pm Post subject: Questions??

Cleones wrote:



 	  Quote: 	
		   



 Hi Bob,  In the John Deere alternator and regulator frequently talked 

 about here is the rectifier in the regulator?


	


Yes.



 	  Quote: 	
		     And,   Is the alternator generating 3 phase AC ?


	


No.  It is single phase AC. There are only two wires coming out of it.



 	  Quote: 	
		   And, about what voltage is the output of the alternator.


	


It will go up to about 200 volts open circuit but when loaded it will be 

in the vicinity of 15 volts depending on how you measure it.



 	  Quote: 	
		     Also, since we know that the # 5 terminal must be connected to 

 voltage or the alternator doesn't work.  I have tried this and it is 

 true.  Then what is the circuit like?  And would it be a good place to 

 connect the overvoltage crowbar to?  Enjoyed your lectures at 

 Bloomington recently.  Cleone 


	


I interupt the wires into the regulator. In the past Bob has said that 

either into or out of the regulator will do the job but I wanted to be 

able to cut power to the regulator in case it was overheating or 

internally shorted.  The regulator uses the battery connection to turn 

itself on and to sense the battery voltage so that it can regulate to 

14.4 volts nominal output.



Ken

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cleone(at)rr1.net
Guest

Posted: Mon Dec 04, 2006 2:25 pm Post subject: Questions??

At 05:27 PM 12/2/2006, you wrote:

 	  Quote: 	

Cleones wrote:

>

>

>Hi Bob,  In the John Deere alternator and regulator frequently 

>talked about here is the rectifier in the regulator?

Yes.

>   And,   Is the alternator generating 3 phase AC ?

No.  It is single phase AC. There are only two wires coming out of it.

>And, about what voltage is the output of the alternator.

It will go up to about 200 volts open circuit but when loaded it 

will be in the vicinity of 15 volts depending on how you measure it.

>   Also, since we know that the # 5 terminal must be connected to 

> voltage or the alternator doesn't work.  I have tried this and it 

> is true.  Then what is the circuit like?  And would it be a good 

> place to connect the overvoltage crowbar to?  Enjoyed your 

> lectures at Bloomington recently.  Cleone

I interupt the wires into the regulator. In the past Bob has said 

that either into or out of the regulator will do the job but I 

wanted to be able to cut power to the regulator in case it was 

overheating or internally shorted.

 	  Quote: 	
		  The regulator uses the battery connection to turn itself on and to 

sense the battery voltage so that it can regulate to 14.4 volts nominal output.

Ken

Ken,

 	  Quote: 	
		        Thanks.  Let me consider this.   So.. doesn't this indicate 

 using a NO relay?  This circuit might be carring very high current 

 at the time the relay opened.  Hopefully the contacts would not be 

 welded closed and the spinning alternator would not be delivering 

 current to the regulator and we would achieve the desired 

 results.  I don't know if an attempt to fuse the AC output at a 

 little more than the rated current of the alternator is called for 

 or not.  This might not be advisable because it might cause the 

 charging to be shut down unnecesarily.  Do you agree with my 

 thoughts?  Also regarding the # 5 connection of the regulator.  I 

 started the engine and made sure the alternator was working with 

 the wire connected and then redid  this with the wire off.  The 

 first time the voltage was about 14 volts and the second time it 

 was just a little over 12.  Thanks again.

Cleone

 	  Quote:

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klehman(at)albedo.net
Guest

Posted: Wed Dec 06, 2006 6:34 am Post subject: Questions??

Cleones wrote:



 	  Quote: 	
		   



 At 05:27 PM 12/2/2006, you wrote:



> 

>

> Cleones wrote:

>

>> 

>>

>> Hi Bob,  In the John Deere alternator and regulator frequently 

>> talked about here is the rectifier in the regulator?

> Yes.

>

>>   And,   Is the alternator generating 3 phase AC ?

> No.  It is single phase AC. There are only two wires coming out of it.

>

>> And, about what voltage is the output of the alternator.

> It will go up to about 200 volts open circuit but when loaded it will 

> be in the vicinity of 15 volts depending on how you measure it.

>

>>   Also, since we know that the # 5 terminal must be connected to 

>> voltage or the alternator doesn't work.  I have tried this and it is 

>> true.  Then what is the circuit like?  And would it be a good place 

>> to connect the overvoltage crowbar to?  Enjoyed your lectures at 

>> Bloomington recently.  Cleone

> I interupt the wires into the regulator. In the past Bob has said 

> that either into or out of the regulator will do the job but I wanted 

> to be able to cut power to the regulator in case it was overheating 

> or internally shorted.

> The regulator uses the battery connection to turn itself on and to 

> sense the battery voltage so that it can regulate to 14.4 volts 

> nominal output.

>

> Ken

 Ken,



>      Thanks.  Let me consider this.   So.. doesn't this indicate 

> using a NO relay?  This circuit might be carring very high current at 

> the time the relay opened.  Hopefully the contacts would not be 

> welded closed and the spinning alternator would not be delivering 

> current to the regulator and we would achieve the desired results.  I 

> don't know if an attempt to fuse the AC output at a little more than 

> the rated current of the alternator is called for or not.  This might 

> not be advisable because it might cause the charging to be shut down 

> unnecesarily.  Do you agree with my thoughts?  Also regarding the # 5 

> connection of the regulator.  I started the engine and made sure the 

> alternator was working with the wire connected and then redid  this 

> with the wire off.  The first time the voltage was about 14 volts and 

> the second time it was just a little over 12.  Thanks again.



 Cleone


	


Cleone



Yes I use a NO relay. My alternator switch applies power to the 

"Battery" connection on the regulator and to the OVM module and it 

closes the NO relay. Your voltage readings are indeed what I would 

expect to see.



Fusing the output of an alternator won't provide Over Voltage 

protection. It is done to simply to protect the wire from battery 

current if the alternator should short out. So in this case my fuse or 

circuit breaker is between the battery and the regulator to protect the 

wire from overheating because of battery supplied current if there is a 

short in the regulator or the alternator. I think I had a 30 amp CB on 

hand and used that.



I hope I'm not muddying this for you. My wires from the alternator to 

the regulator are sized at 12 awg to handle the 20 amp max output so 

they are not at risk from the alternator if the regulator shorts. 

Putting the OV relay in those ac wires would provide a means of 

disconnecting the supply to the regulator though which is what I did.



Ken

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