Power up HDX1100 from backup battery?

[mwtucker]

One of my fellow builders told me that the Skyview system with a backup battery can be powered up without turning on the avionics master switch. This would be done to observe engine data (e.g. oil pressure) at startup before turning on the avionics master. I think he said that you can long-press (3 seconds?) one of the keys (maybe key 1?). I can't find anything about this in the User Manual?

Thanks!
Mike

 

[Rhino]

Out of curiosity, why would you need to see engine data before turning on the avionics master? Your avionics being on shouldn't be changing anything with your engine.

The battery test procedure is on Page 22-10 of the current installation manual. The Skyview must be powered up before you cut power, so the backup battery knows it's supposed to take over. Battery life should be 45 minutes, which would give you more than enough time to see the engine data you want.

 

[RV8JD]

Helpful Skyview button presses. The first one will do what you're looking for.

- Power On/Off - Press & hold Button #1
- Setup Menu - Press & hold buttons #7 and #8 simultaneously
- Screen Capture - Press buttons #2 and #7 simultaneously
- Reboot - Press buttons #1, #2, and #5 simultaneously

Having posted that, my SV Touch comes on with the Master switch so all engine readings are visible during engine start. The rest of the avionics comes on with the Avionics switch. Dynon says that is fine. From the install manual:

"SkyView System Can Be On During Engine Start
All Dynon Avionics units in a SkyView system incorporate robust power protection that allows
them to be powered on during engine start for full engine monitoring. SkyView displays require
a minimum of 10V, and during engine start, it’s common for the electrical system to
temporarily drop below 10V. If an SV-BAT-320 Backup Battery is not installed, SkyView may
shut off / reboot. If you wish to monitor your engine prior to engine start, an SV-BAT-320
should be installed so that the SkyView display can switch to the SV-BAT-320 when its power
inputs are not receiving at least 10V. The SkyView display will switch from SV-BAT-320 to
aircraft power when its power inputs receive voltage above 10V."

 

[mwtucker]

Out of curiosity, why would you need to see engine data before turning on the avionics master? Your avionics being on shouldn't be changing anything with your engine.

The battery test procedure is on Page 22-10 of the current installation manual. The Skyview must be powered up before you cut power, so the backup battery knows it's supposed to take over. Battery life should be 45 minutes, which would give you more than enough time to see the engine data you want.

Hi Rhino...I want to have the engine data visible so I can (primarily) verify that I have oil pressure right after starting (don't want to wait for system to boot).

 

[mwtucker]

Helpful Skyview button presses. The first one will do what you're looking for.

- Power On/Off - Press & hold Button #1
- Setup Menu - Press & hold buttons #7 and #8 simultaneously
- Screen Capture - Press buttons #2 and #7 simultaneously
- Reboot - Press buttons #1, #2, and #5 simultaneously

Having posted that, my SV Touch comes on with the Master switch so all engine readings are visible during engine start. The rest of the avionics comes on with the Avionics switch. Dynon says that is fine. From the install manual:

"SkyView System Can Be On During Engine Start
All Dynon Avionics units in a SkyView system incorporate robust power protection that allows
them to be powered on during engine start for full engine monitoring. SkyView displays require
a minimum of 10V, and during engine start, it’s common for the electrical system to
temporarily drop below 10V. If an SV-BAT-320 Backup Battery is not installed, SkyView may
shut off / reboot. If you wish to monitor your engine prior to engine start, an SV-BAT-320
should be installed so that the SkyView display can switch to the SV-BAT-320 when its power
inputs are not receiving at least 10V. The SkyView display will switch from SV-BAT-320 to
aircraft power when its power inputs receive voltage above 10V."

I may have made a bad decision to have both HDX displays on the avionics bus (downstream from the avionics master). I know that Dynon says it is OK to start the engine with all systems powered, but I was used to (in the old days!) starting the engine, looking at my analog oil pressure gauge, and then powering up the avionics.

 

[jakej]

I may have made a bad decision to have both HDX displays on the avionics bus (downstream from the avionics master). I know that Dynon says it is OK to start the engine with all systems powered, but I was used to (in the old days!) starting the engine, looking at my analog oil pressure gauge, and then powering up the avionics.

You could stay with the Dynons powered via the avionics switch & just boot up 1 x Dynon via its backup battery. Personally, & on all the installs I've done, I'd just have the Dynons power up with the master on as per the OP. If you're concerned about battery drain then maybe just have 1 Dynon connected to master sw on ops.

 

[mwtucker]

You could stay with the Dynons powered via the avionics switch & just boot up 1 x Dynon via its backup battery. Personally, & on all the installs I've done, I'd just have the Dynons power up with the master on as per the OP. If you're concerned about battery drain then maybe just have 1 Dynon connected to master sw on ops.

Thanks Jake.