I finally started wiring my panel in earnest. I've kept a spreadsheet for the past year or so, planning every wire. But I have a sanity check for my backup power options.
The system is a G3X Touch two-screen setup, two GSU 25's, one G5, one GEA 24, GMA 245R, GTR 20, GTX 45R, GAD 29, and GTN 650Xi. For power supplies, I have a VP-X Pro and a TCW iBBS. The G5 has its piggyback backup battery.
I had planned that the iBBS would power the PFD, GEA 24, primary GSU 25, and MFD. The MFD made the cut because it could be used to troubleshoot the VP-X if it is alive but not supplying power to the VP-X. My panel also has an alternate trim switch that uses iBBS power and a momentary up/down switch on the panel to operate the pitch trim servo in the event the primary trim circuit fails.
But now I am second-guessing the GSU part of the backup power plan. I have both GSU's on separate VP-X circuits, so I can shut one off if it provides inaccurate data (the failed GSU can be identified by cross-checking the G5, PFD, and MFD). Having backup power to the #1 GSU means that I would have to turn off the backup battery to fully power it down if it is the failed unit.
If both GSU's are offline, the PFD and MFD should get attitude and air data from the G5. So if I do not provide backup power to either GSU, I only have to hope that my main electrical system and G5 don't both die in IMC at the same time.
The question is this: If the G3X PFD and MFD are booted up (iBBS switch on) and the GSU's come online either during or after the bootup (main power turned on after iBBS), will they sync up okay or will the system complain and make me intervene? (Or worse, silently use the G5 instead of the GSU data.)
Other sanity check items for consideration:
1. Should I remove the MFD from the iBBS power? The iBBS would last maybe 75% longer with only one screen to power. I'm not 100% decided on the balance between the power usage vs. losing the MFD in a main power failure scenario and welcome any input.
2. If I provide backup power to the GTR 20 and wire it as comm #1 on the GMA 245R, I will have a failsafe comm radio when the main power goes offline. Will the PFD tuning control for the GTR 20 work okay when the GMA is offline, or are the on-screen controls for the remote radio and remote audio panel too integrated to tolerate that?
The system is a G3X Touch two-screen setup, two GSU 25's, one G5, one GEA 24, GMA 245R, GTR 20, GTX 45R, GAD 29, and GTN 650Xi. For power supplies, I have a VP-X Pro and a TCW iBBS. The G5 has its piggyback backup battery.
I had planned that the iBBS would power the PFD, GEA 24, primary GSU 25, and MFD. The MFD made the cut because it could be used to troubleshoot the VP-X if it is alive but not supplying power to the VP-X. My panel also has an alternate trim switch that uses iBBS power and a momentary up/down switch on the panel to operate the pitch trim servo in the event the primary trim circuit fails.
But now I am second-guessing the GSU part of the backup power plan. I have both GSU's on separate VP-X circuits, so I can shut one off if it provides inaccurate data (the failed GSU can be identified by cross-checking the G5, PFD, and MFD). Having backup power to the #1 GSU means that I would have to turn off the backup battery to fully power it down if it is the failed unit.
If both GSU's are offline, the PFD and MFD should get attitude and air data from the G5. So if I do not provide backup power to either GSU, I only have to hope that my main electrical system and G5 don't both die in IMC at the same time.
The question is this: If the G3X PFD and MFD are booted up (iBBS switch on) and the GSU's come online either during or after the bootup (main power turned on after iBBS), will they sync up okay or will the system complain and make me intervene? (Or worse, silently use the G5 instead of the GSU data.)
Other sanity check items for consideration:
1. Should I remove the MFD from the iBBS power? The iBBS would last maybe 75% longer with only one screen to power. I'm not 100% decided on the balance between the power usage vs. losing the MFD in a main power failure scenario and welcome any input.
2. If I provide backup power to the GTR 20 and wire it as comm #1 on the GMA 245R, I will have a failsafe comm radio when the main power goes offline. Will the PFD tuning control for the GTR 20 work okay when the GMA is offline, or are the on-screen controls for the remote radio and remote audio panel too integrated to tolerate that?