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  #171  
Old 08-07-2018, 05:12 PM
mfshook62 mfshook62 is offline
 
Join Date: Sep 2008
Location: Windsor, Ca
Posts: 107
Default Considering a Larger Backup Battery

Hello Ross,

I am impressed with your progress and game plan for the CPI2 and have pretty much made my mind up to purchase one this winter. I have a question regarding a backup battery. I will be adding a Skyview flat panel at the same time and it also needs a backup battery. I am thinking about using a single lithium iron phosphate (10-12 Ah) backup battery to power the CPI2 and the avionics bus in case a voltage problem occurs. This should give me plenty of time to sort out the problem and get to an airport. Will the CPI2 keep this larger backup battery charged and be able to switch over and have the capacity to also supply current to the Avionics bus, or will I need to manually charge and switch on the backup battery? What are your concerns with this idea?
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Mike Shook, RV-9A, Catto Prop, EAA 124

Last edited by mfshook62 : 08-07-2018 at 05:32 PM.
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  #172  
Old 08-07-2018, 06:52 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default

Quote:
Originally Posted by mfshook62 View Post
Hello Ross,

I am impressed with your progress and game plan for the CPI2 and have pretty much made my mind up to purchase one this winter. I have a question regarding a backup battery. I will be adding a Skyview flat panel at the same time and it also needs a backup battery. I am thinking about using a single lithium iron phosphate (10-12 Ah) backup battery to power the CPI2 and the avionics bus in case a voltage problem occurs. This should give me plenty of time to sort out the problem and get to an airport. Will the CPI2 keep this larger backup battery charged and be able to switch over and have the capacity to also supply current to the Avionics bus, or will I need to manually charge and switch on the backup battery? What are your concerns with this idea?
Mike, we appreciate you waiting for the CPI2.

We charge the backup battery at a very low rate to just keep it topped up. There is no provision to charge this battery if the alternator takes a dump but with 10-12 Ah, you can run the CPI2 for several hours. It will automatically switch over to the backup when voltage falls below a preset value. We also have selectable thresholds for different battery chemistries.

Not sure what kind of current the Skyview draws or how long you want to run after the alternator dies but all that is pretty easy to calculate if current draw is known.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #173  
Old 08-13-2018, 09:00 PM
mfshook62 mfshook62 is offline
 
Join Date: Sep 2008
Location: Windsor, Ca
Posts: 107
Default Want to Keep My Key Switch

Hello Ross,

I'm sure many folks, myself included, will be converting from traditional magnetos or PMags to the CPI2, and we all need to decide what to do with the key switch and existing p-leads. I don’t like the idea of removing the key switch and possibly replacing it with two ignition on-off switches and a start button. I have looked at the wiring diagram on your website to use the existing p-leads to activate a relay to power the ignition modules. I would much prefer to use the p-lead to momentarily shut off the ignition for a mag check than to depend on a p-lead powered relay to provide full time 12 volts to an ignition module.

I know that it is late in the CPI2 introduction process, but I have a request. Is there anywhere in the new CPI2 module to add a p-lead to momentarily ground out a component that powers the coil pack to enable a mag check? This will make the conversion to the CPI2 more conventional, easier to install and, in my reasoning, more reliable. And we can keep our fully functioning key switch.

Thanks for your time,


Mike
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Mike Shook, RV-9A, Catto Prop, EAA 124

Last edited by mfshook62 : 08-13-2018 at 09:41 PM.
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  #174  
Old 08-13-2018, 09:39 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default

The CPI2 has a built in "mag check" window to verify operation of the 2 systems so you don't need any external switches if you don't want them.

Alternately, you can use the center pin (87A) on a VF4 relay hooked to your old key switch ground to turn coil power off.

http://www.sdsefi.com/magswitchrelay.pdf
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #175  
Old 08-14-2018, 12:26 PM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default

Completing some RF interference testing on the boards today and happy how that went. There will be some more thermal imaging done on the board soon before we freeze the PCB design and send it off for production before month end hopefully.

Keypad layout is frozen now. That will go out for quotes soon too.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #176  
Old 08-14-2018, 01:05 PM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 432
Default

Quote:
Originally Posted by mfshook62 View Post
Hello Ross,



I know that it is late in the CPI2 introduction process, but I have a request. Is there anywhere in the new CPI2 module to add a p-lead to momentarily ground out a component that powers the coil pack to enable a mag check? This will make the conversion to the CPI2 more conventional, easier to install and, in my reasoning, more reliable. And we can keep our fully functioning key switch.

Thanks for your time,


Mike
Mike, Iíve sent you a PM
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Ralph
Maintain lots, upgraded & repaired some, modified more, rebuild a few, & built 4 of 'em
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  #177  
Old 08-17-2018, 09:31 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default 2nd thermal imaging test

Shot the 2nd proto board today to confirm what we already knew. The SMT voltage regulator ran hot despite tons of via holes nearby it to try to sink the heat away. Lower left. While within specs, we never like hot running components on our boards as they may see 50C ambient conditions in some southern states.



Barry devised a fix today to mount a through hole, old school 7805 to the board with a cutout to the allow it to sink directly to the chassis like the EM-5 does. The mod is already done in CAD which should be the last of the changes before we submit the files for production. Lots of components and traces to move to fit the much larger device into the space where the small SMT component was.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm



Last edited by rv6ejguy : 08-17-2018 at 09:35 PM.
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  #178  
Old 08-27-2018, 06:13 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default Enclosure Design

Now that the PCB outline has been frozen, Barry has been able to get the enclosure design into CAD and check the dimensions with the PCB CAD. This will be sent on to the machine shop this week for prototyping.

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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #179  
Old 09-19-2018, 11:08 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default Update

The machine shop has been unable to keep up with other parts demand and is only now getting to machining the proto enclosure this week.

Keypad design has been sent out for quoting to 3 vendors.

Programmer head enclosure CAD is complete, files sent off to machine shop, might see that by the end of the month.

Revised the main PCB and are eliminating some unneeded components. That will go out for production next week.

This stuff takes forever when you are busy with other orders. September has been crazy for us. Good in one way, bad for getting this design in production.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #180  
Old 09-24-2018, 09:00 AM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,844
Default CAD Snippet



This render shows part of the dual CPI2 enclosure with the MAP ports and part of the main connector package plus PCB outline for the top board.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 426.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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