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DFC90 and power source for Cirrus

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Cirrusdude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cirrusdude Quote  Post ReplyReply Direct Link To This Post Topic: DFC90 and power source for Cirrus
    Posted: 21 Nov 2014 at 11:07am
I understand the DFC90 is connected to the main bus (Alt1/Batt1) whereas the current Stec autopilot is connected to the essential bus (Alt2/Batt2). Furthermore, if Alt 1 goes offline, and then you turn off Batt1, the DFC90 will go off line too. Why did Avidyne configure the DFC90 to connect to the main bus? I would have thought it should be connected to the essential Bus.

Thanks
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JBAvidyne View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JBAvidyne Quote  Post ReplyReply Direct Link To This Post Posted: 24 Nov 2014 at 3:07pm
Avidyne has posted a Service Information Letter 606-00170-003 that addresses this very issue.   I would recommend downloading and reading the SIL to have  a better understanding of the behavior of the DFC90 in the Cirrus.  

Avidyne has worked closely with flight instructors, owners, and pilots through Cirrus Owners and Pilots Association (COPA) to educate Cirrus pilot's of the DFC90 behavior during an Alt1 failure.  
Jared Butson (jbutson@avidyne.com)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cirrusdude Quote  Post ReplyReply Direct Link To This Post Posted: 25 Nov 2014 at 10:08am
Jared,

Can I buy the DFC 90 with Service Bulletin 1 installed but not Service Bulletin 2 installed?
Tim
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JBAvidyne Quote  Post ReplyReply Direct Link To This Post Posted: 25 Nov 2014 at 11:07am
For a variety of performance, safety, and feature set reasons, Avidyne does not make previous software releases available.  This applies to all of Avidyne's equipment, including the DFC90.
Jared Butson (jbutson@avidyne.com)
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zman520 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zman520 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Mar 2015 at 1:59pm
If the DFC-90 was a direct slide in replacement of the STEC, how is it getting its power form another bus?
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clydeps View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote clydeps Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 2016 at 8:17pm
Update on this issue - I had a simple wiring change done on my SR22 recently that solves the problem.

Pin 50 on autopilot connector P552 (labelled 14/28VDC TRIM) originally connected to the pitch trim power via wire CPT621-22. This has been reconnected to the autopilot power AACC629-22 which comes from the essential bus, and now the A/P works normally with the main bus off.

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ansond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ansond Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec 2016 at 5:43pm
Clyde - just wanted confirm that wiring change.. was pin 50 on the A/P an voltage input or output?  I was wondering as the wiring diagram is not clear.... with the wiring change, is  CPT621-22 now unconnected to the DFC?

Doug 
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