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Z-13/8 Rev. O questions

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jgswartout(at)earthlink.n
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Posted: Wed Jul 09, 2008 9:14 am Post subject: Z-13/8 Rev. O questions

Dear Bob,

 

I note you made several changes to Z-25 Rev. L when incorporating it into Rev. O of Z-13/8.  It would be comforting to know if these are critical changes.

 

1.  The diode between the COM and the + side of the coil terminal of the relay is gone.

 

2.  The diode between the N.O. and the + side of the coil terminal of the relay is gone--in fact there is no wire at all between these two terminals now.

 

3.  The resistor attached to the bridge rectifier is now 1K/5W instead of 3K/3W.

 

4.  The resistor across the capacitor terminals is now 1K/5W instead of 1K/3W.

 

5.  The fuselink on the 14AWG wire leading to the battery contactor went from 18AWG to 20AWG.  (I know you maintain the Z-diagrams are intended to show architecture, not specific wire sizes, but the convention you have stipulated for sizing fuselinks is four numbers less than the wire size of the protected wire, not six.)

 

6.  Ground wire from the relay through the Aux Alt Off/On switch went from 20AWG to 22AWG and the circuit breaker went from 2A to 5A.

 

Thanks.

 

John

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nuckolls.bob(at)cox.net
Guest

Posted: Wed Jul 09, 2008 12:21 pm Post subject: Z-13/8 Rev. O questions

At 01:07 PM 7/9/2008 -0400, you wrote:

 	  Quote: 	
		  

<jgswartout(at)earthlink.net>



Dear Bob,



I note you made several changes to Z-25 Rev. L when incorporating it into 

Rev. O of Z-13/8.  It would be comforting to know if these are critical 

changes.



1.  The diode between the COM and the + side of the coil terminal of the 

relay is gone.



2.  The diode between the N.O. and the + side of the coil terminal of the 

relay is gone--in fact there is no wire at all between these two terminals now.


	


    Those two diodes let you energize the alternator control

    relay sourced from either the running alternator -or- a battery.

    I neglected to incorporate those in transplanting the Z25 to

    Z13/8.



 	  Quote: 	
		  

3.  The resistor attached to the bridge rectifier is now 1K/5W instead of 

3K/3W.



4.  The resistor across the capacitor terminals is now 1K/5W instead of 1K/3W.


	


   Hmmm . . . the 1K vs 3K was a type and either a 3 or 5 watt would do.

   I've fixed the values and added a part number for an easy

   to find, 3w device.

 	  Quote: 	
		  

5.  The fuselink on the 14AWG wire leading to the battery contactor went 

from 18AWG to 20AWG.  (I know you maintain the Z-diagrams are intended to 

show architecture, not specific wire sizes, but the convention you have 

stipulated for sizing fuselinks is four numbers less than the wire size of 

the protected wire, not six.)


	


   4 or more . . . and in this case, the 20AWG was more

   attractive. It will handily carry 10A from the SD8 and

   offers about 2x the fusing speed under fault conditions.

 	  Quote: 	
		  

6.  Ground wire from the relay through the Aux Alt Off/On switch went from 

20AWG to 22AWG and the circuit breaker went from 2A to 5A.


	


    Goofed again. 2A is the correct value for the

    smaller wire.



    Thanks for the time and attention to review this.

    I've made corrections and published revision P

    to Z-13/8. Your assistance is valuable and much

    appreciated!



    Bob . . .

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