[RE-wrenches] Trace SW Stacking Cable?

[Jeff Clearwater, Village Power Design]

Hi William and All,

Thanks to all for the offers and clarifications.  I may have located 
a cable locally and if not will probably make one up per William's 
and Phil's instructions.

And as William and others have said  - do not use anything as an SWI 
cable unless you know it's an original SWI cable or have made up the 
cable yourself according to the original SW pin out diagrams.

Thanks again for all the support.

Best,

Jeff



>Carl:
>
>I have checked with Xantrex.  I would not make a declaration on the 
>Wrenches forum to my esteemed colleagues unless I was quite certain. 
>Find the "SWI Stacking Cable wiring diagram" on our web site at: 
>http://millersolar.com/resources/resources.html under 
>"Manufacturer's data".  This diagram came directly from a Xantrex 
>engineer.  I have no reason to doubt it's authenticity. This is not 
>the pin out for a "standard" DB25 cable.  Not also the link just 
>below it for "Not an SWI cable"  This is your "standard" cable.  I 
>fished this out of my attic this evening and scanned it still in the 
>package.  Note it is listed as a "straight through" cable.  This 
>means pin 1 connects to pin 1, pin 2 to pin 2, etc.  This is not the 
>same wiring as depicted in the SWI stacking cable diagram.
>
>I believe you have suggested twice that solar installers grab the 
>nearest "standard" DB25 cable and give it a try.  I feel compelled 
>to correct the record publicly.  These are not the same cables and 
>unspecified damage could occur.  I know I once shorted out a sync 
>cable for Heart Interface inverters and blew two of them up 
>catastrophically two days before Christmas.  It was a very 
>unpleasant surprise for the client (who had guests coming) and for 
>my self.  These cables are a direct link to the FET control circuits 
>and need to be treated with the utmost caution.
>
>I don't know what would happen to two SW inverters if connected with 
>your straight through cable, but I recommend strongly against trying 
>it.  Please do not recommend practices unless you are quite certain 
>they will cause no harm.
>
>
>Respectfully,
>
>William Miller
>
>PS:  Printer cables were never DB25-DB25.  They were DB25 to Centronics.
>
>Wm
>
>
>
>
>
>At 10:01 AM 3/31/2009, you wrote:
>
>>William,
>>
>>   I used an off the shelf cable to use with the SW and PS remote, 
>>it was a double male ended  25 pin cable. They were formally used 
>>as printer/computer cables. I believe the stacking cable is the 
>>same style. You could check with Xantrex.
>>
>>   Carl Hansen
>>
>
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-- 
~~~~~~~~~~~~~
Jeff Clearwater
Senior Design Engineer
NABCEP (tm) Certified Solar PV Installer
http://www.nabcep.org/
Village Power Design/NorthEast Solar Design
Turnkey Solar Design & Installation for the Commercial Sector
http://www.villagepower.com
gosolar at villagepower.com

Voice: 413-259-3750
Fax: 413-825-0703
65 Schoolhouse Rd
Amherst, MA 01002
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