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Autopilot Problem

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lordm87(at)hotmail.com
Guest

Posted: Mon Sep 08, 2008 10:22 am Post subject: Autopilot Problem

I am looking for advice on how to troubleshoot the following problem with my autopilot.  My setup is as follows.  I have a King KCS-55A Compass system with the KI-525A HSI indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected to the HSI is a King KX-165 and Northstar M3 Approach GPS

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recapen(at)earthlink.net
Guest

Posted: Mon Sep 08, 2008 12:18 pm Post subject: Autopilot Problem

Mike,



Same issue as what I'm having with my S-Tec System 30 except it is only to the left.

S-Tec told me to check the outputs of my HSI (Century NSD1000) to match +- 5VDC depending on which side of the bug you're on.  Haven't been able to do that as my GPSS module crapped out and I had to sent it in for repairs - it's back and I haven't had time to test it again.....



I need to test that and the alt hold module - in case I need to reverse pins 3 and 4.....



Check with S-Tec about what the specs should be for your King HSI...



Let me know what you come up with... 



Ralph



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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Sep 08, 2008 1:17 pm Post subject: Autopilot Problem

That sounds like a polarity reverse.  Rather than going through all the block connections why not just reverse the polarity of the aileron actuator motor...  Be sure to mark this change on your block interconnect diagram if you made one.  

   

Noel  

[img]cid:image003.jpg(at)01C911E3.35F16270[/img]  

   

Noel Loveys  

Campbellton, NL, Canada  

CDN AME intern, PP-Rec  

C-FINB, Kitfox III-A  

Aerocet 1100 floats  

[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]  

   

   

       

From: owner-avionics-list-server(at)matronics.com [mailto:owner-avionics-list-server(at)matronics.com] On Behalf Of Mike Lord

 Sent: Monday, September 08, 2008 3:52 PM

 To: avionics-list(at)matronics.com

 Subject: FW: Autopilot Problem  

  

  

       

   

  

I am looking for advice on how to troubleshoot the following problem with my autopilot.  My setup is as follows.  I have a King KCS-55A Compass system with the KI-525A HSI indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected to the HSI is a King KX-165 and Northstar M3 Approach GPS.  

   

The problem, which happened during my last flight is; when the autopilot in set to the heading mode, it will not track to the bug setting, it will either roll to the left or right all the way to the aileron stops.  The closer it is the bug setting the slower the roll and just about stops at the bug.  The same thing appears to happen in the NAV mode when driven by the VOR or GPS.  

   

I have checked and reseated all connections on the turn coordinator, autopilot controller, roll computer and HSI with no luck.  

   

Thanks for the advice.  

   

Mike  

N1193D AG5B Tiger   

   

   

  

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

tiethoff

Joined: 02 Sep 2008
Posts: 23

Posted: Mon Sep 08, 2008 2:51 pm Post subject: Autopilot Problem

Are your baudrates correct  ? Look in your manual fot the correct settings.

  



  From: Mike Lord (lordm87(at)hotmail.com) 

 Sent: Monday, September 08, 2008 8:21 PM

 To: avionics-list(at)matronics.com (avionics-list(at)matronics.com) 

 Subject: FW: Autopilot Problem

 



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I am looking for advice on how to  troubleshoot the following problem with my autopilot.  My setup is as  follows.  I have a King KCS-55A Compass system with the KI-525A HSI  indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected  to the HSI is a King KX-165 and Northstar M3 Approach GPS. 

  

The problem, which happened during  my last flight is; when the autopilot in set to the heading mode, it will not  track to the bug setting, it will either roll to the left or right all the way  to the aileron stops.  The closer it is the bug setting the slower the roll  and just about stops at the bug.  The same thing appears to happen in the  NAV mode when driven by the VOR or GPS. 

  

I have checked and reseated all  connections on the turn coordinator, autopilot controller, roll computer and HSI  with no luck. 

  

Thanks for the  advice. 

  

Mike 

N1193D AG5B Tiger  

  

 

[quote]



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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Sep 08, 2008 5:20 pm Post subject: Autopilot Problem

The further you are off course the more deviation goes to the controller and the more power is fed to the aileron actuator.  The problem is your aileron actuator is going the wrong way this can only be because either the inputs to the controller from the HSI are reversed or the power wires to the aileron actuator are reversed.  One, not both, of these things are the problem.  I recommended reversing the power wires to the actuator forgetting that most of the planes on this list are certified.  For a certified plane triple check the polarity of the controller inputs from the HSI to the autopilot controller.  If that is perfect, then reverse the polarity of the two wires going into the aileron actuator.  Do not change any other wiring ( assuming everything else works properly).  

   

   

[img]cid:image003.jpg(at)01C91205.211E9A80[/img]  

   

Noel Loveys  

Campbellton, NL, Canada  

CDN AME intern, PP-Rec  

C-FINB, Kitfox III-A  

Aerocet 1100 floats  

[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]  

   

   

       

From: owner-avionics-list-server(at)matronics.com [mailto:owner-avionics-list-server(at)matronics.com] On Behalf Of Eric Tiethoff (HCCNet)

 Sent: Monday, September 08, 2008 8:20 PM

 To: avionics-list(at)matronics.com

 Subject: Re: FW: Autopilot Problem  

  

  

     

Are your baudrates correct ? Look in your manual fot the correct settings.  

      

   

      

From: Mike Lord (lordm87(at)hotmail.com)   

    

Sent: Monday, September 08, 2008 8:21 PM  

    

To: avionics-list(at)matronics.com (avionics-list(at)matronics.com)   

    

Subject: FW: Autopilot Problem  

  

  

    

   

      

   

  

I am looking for advice on how to troubleshoot the following problem with my autopilot.  My setup is as follows.  I have a King KCS-55A Compass system with the KI-525A HSI indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected to the HSI is a King KX-165 and Northstar M3 Approach GPS.  

   

The problem, which happened during my last flight is; when the autopilot in set to the heading mode, it will not track to the bug setting, it will either roll to the left or right all the way to the aileron stops.  The closer it is the bug setting the slower the roll and just about stops at the bug.  The same thing appears to happen in the NAV mode when driven by the VOR or GPS.  

   

I have checked and reseated all connections on the turn coordinator, autopilot controller, roll computer and HSI with no luck.  

   

Thanks for the advice.  

   

Mike  

N1193D AG5B Tiger   

   

   

  

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Sep 08, 2008 5:23 pm Post subject: Autopilot Problem

Woops.... if this only happens ONLY when the heading hold is selected then the output from the HSI to the autopilot controller must be reversed.  If the auto pilot always reverses the correct input then the actuator wires are reversed.  

   

   

[img]cid:image001.jpg(at)01C91205.AF6A8560[/img]  

   

Noel Loveys  

Campbellton, NL, Canada  

CDN AME intern, PP-Rec  

C-FINB, Kitfox III-A  

Aerocet 1100 floats  

[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]  

   

   

       

From: owner-avionics-list-server(at)matronics.com [mailto:owner-avionics-list-server(at)matronics.com] On Behalf Of Eric Tiethoff (HCCNet)

 Sent: Monday, September 08, 2008 8:20 PM

 To: avionics-list(at)matronics.com

 Subject: Re: FW: Autopilot Problem  

  

  

     

Are your baudrates correct ? Look in your manual fot the correct settings.  

      

   

      

From: Mike Lord (lordm87(at)hotmail.com)   

    

Sent: Monday, September 08, 2008 8:21 PM  

    

To: avionics-list(at)matronics.com (avionics-list(at)matronics.com)   

    

Subject: FW: Autopilot Problem  

  

  

    

   

      

   

  

I am looking for advice on how to troubleshoot the following problem with my autopilot.  My setup is as follows.  I have a King KCS-55A Compass system with the KI-525A HSI indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected to the HSI is a King KX-165 and Northstar M3 Approach GPS.  

   

The problem, which happened during my last flight is; when the autopilot in set to the heading mode, it will not track to the bug setting, it will either roll to the left or right all the way to the aileron stops.  The closer it is the bug setting the slower the roll and just about stops at the bug.  The same thing appears to happen in the NAV mode when driven by the VOR or GPS.  

   

I have checked and reseated all connections on the turn coordinator, autopilot controller, roll computer and HSI with no luck.  

   

Thanks for the advice.  

   

Mike  

N1193D AG5B Tiger   

   

   

  

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Sep 08, 2008 5:26 pm Post subject: Autopilot Problem

BTW did you draw up an interconnect diagram and can you scan it so we can see what/how you have your system installed.  

   

Noel  

       

From: owner-avionics-list-server(at)matronics.com [mailto:owner-avionics-list-server(at)matronics.com] On Behalf Of Eric Tiethoff (HCCNet)

 Sent: Monday, September 08, 2008 8:20 PM

 To: avionics-list(at)matronics.com

 Subject: Re: FW: Autopilot Problem  

  

  

     

Are your baudrates correct ? Look in your manual fot the correct settings.  

      

   

      

From: Mike Lord (lordm87(at)hotmail.com)   

    

Sent: Monday, September 08, 2008 8:21 PM  

    

To: avionics-list(at)matronics.com (avionics-list(at)matronics.com)   

    

Subject: FW: Autopilot Problem  

  

  

    

   

      

   

  

I am looking for advice on how to troubleshoot the following problem with my autopilot.  My setup is as follows.  I have a King KCS-55A Compass system with the KI-525A HSI indicator.  This is coupled to an STEC 60-2 autopilot.  Also connected to the HSI is a King KX-165 and Northstar M3 Approach GPS.  

   

The problem, which happened during my last flight is; when the autopilot in set to the heading mode, it will not track to the bug setting, it will either roll to the left or right all the way to the aileron stops.  The closer it is the bug setting the slower the roll and just about stops at the bug.  The same thing appears to happen in the NAV mode when driven by the VOR or GPS.  

   

I have checked and reseated all connections on the turn coordinator, autopilot controller, roll computer and HSI with no luck.  

   

Thanks for the advice.  

   

Mike  

N1193D AG5B Tiger   

   

   

  

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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