Wrenches - William is correct, the SWI cable is not a straight through printer style - it must be wired per the drawing on the link below.
Cheers, Mark Mark Edmunds Director Engineering Residential Renewable Energy Markets Xantrex Technology Inc. [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of William Miller Sent: Tuesday, March 31, 2009 9:51 PM To: RE-wrenches Subject: Re: [RE-wrenches] Trace SW Stacking Cable? 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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