rvmills
Well Known Member
I just posted a similar thread to this on the Dynon site, but thought I'd put out a query to Team VAF to see if anyone has any thoughts on an issue that just popped up with my EFIS D-100 (especially those with Dynons, but any thoughts from the electrical wizards in the group are most welcome!)
My EFIS D-100 is shutting off early during the 30 second shutdown cycle when I turn the battery switch off, and it has me scratching my head. This appears to have started since updating to v 5.0, and installing the AP-74 and Servos, but I do not know if it is related. Here's the set-up:
- D-100 (w/ BU Batt), powered via a dedicated CB on the avionics buss.
- D-10A (w/BU Batt), powered via a second dedicated CB on the avionics buss.
- AP-74 and 2 SV-32 Servos, powered via a third dedicated CB on the avionics buss.
- D-100 Keep Alive, powered via a fourth dedicated CB to hot Batt.
I recently sent the D-100 back to Dynon after my v 5.0 update failed, and it came back (very quickly I might add!) with 5.0, and all indications are normal in flight. AP is functioning, and everything on DSAB is good to go.
As I shut down the aircraft, when I turn the avionics master off, the D-100 and D-10A both begin their 30 second shutdown timer as they did before. However, if I turn the Battery master off during the 30 second countdown, the D-100 shuts off immediately. The D-10A continues it's countdown to zero, then shuts down, as it did before the 5.0 update and the AP install. That's the way the D-100 used to behave as well...this is a new phenomenon, and the batt sw never had this effect before. Both EFIS's always came on with the Av Master, and began the 30 sec timer when the Av Master was shut off.
Suspecting the D-100 backup battery could be part of this (it was drawn down to zero during my earlier 5.0 update issues), I tried to bring the D-100 up on backup batt with Batt and Av masters off, and it booted up just fine. I did note that the clock was wrong...first time I've noted that. I've flown the airplane a few hours since the AP install, so I think the BU batt should be fully charged now.
My questions to Dynon (slightly reworded here) were:
1. Given that the power wiring hasn't changed for the D-100 (the only change I made to the D-100 wiring during the AP install was to tie the AP-74 and servos into the D-100 DSAB A/B wires...power wire was not touched), is there anything anyone can think of that would cause this behavior?
2. Could it be an issue with the charge state of the BU batt (and is there any way to check that state...maybe via a menu, vs. pulling it out and checking it with a meter)?
3. Given that the clock was wrong, could there be something up with Keep Alive that could cause this? Keep Alive is the only piece that goes to the battery, but it is unswitched (CB protected, but not going through the batt switch) and I haven't changed the keep alive circuit wiring, so that steers me away from this as the culprit...but then there is that clock thing!
4. While I troubleshoot this, and until I figure it out, any thoughts on whether I am causing harm to the D-100 if I shut off the Batt master and the EFIS shuts down as described (I can wait the full 30 secs for the EFIS to shut off before turning the batt off, but I'd like to make sure I don't have another issue going on).
Any ideas you guys might have are very much appreciated! Thanks much!!
Cheers,
Bob
My EFIS D-100 is shutting off early during the 30 second shutdown cycle when I turn the battery switch off, and it has me scratching my head. This appears to have started since updating to v 5.0, and installing the AP-74 and Servos, but I do not know if it is related. Here's the set-up:
- D-100 (w/ BU Batt), powered via a dedicated CB on the avionics buss.
- D-10A (w/BU Batt), powered via a second dedicated CB on the avionics buss.
- AP-74 and 2 SV-32 Servos, powered via a third dedicated CB on the avionics buss.
- D-100 Keep Alive, powered via a fourth dedicated CB to hot Batt.
I recently sent the D-100 back to Dynon after my v 5.0 update failed, and it came back (very quickly I might add!) with 5.0, and all indications are normal in flight. AP is functioning, and everything on DSAB is good to go.
As I shut down the aircraft, when I turn the avionics master off, the D-100 and D-10A both begin their 30 second shutdown timer as they did before. However, if I turn the Battery master off during the 30 second countdown, the D-100 shuts off immediately. The D-10A continues it's countdown to zero, then shuts down, as it did before the 5.0 update and the AP install. That's the way the D-100 used to behave as well...this is a new phenomenon, and the batt sw never had this effect before. Both EFIS's always came on with the Av Master, and began the 30 sec timer when the Av Master was shut off.
Suspecting the D-100 backup battery could be part of this (it was drawn down to zero during my earlier 5.0 update issues), I tried to bring the D-100 up on backup batt with Batt and Av masters off, and it booted up just fine. I did note that the clock was wrong...first time I've noted that. I've flown the airplane a few hours since the AP install, so I think the BU batt should be fully charged now.
My questions to Dynon (slightly reworded here) were:
1. Given that the power wiring hasn't changed for the D-100 (the only change I made to the D-100 wiring during the AP install was to tie the AP-74 and servos into the D-100 DSAB A/B wires...power wire was not touched), is there anything anyone can think of that would cause this behavior?
2. Could it be an issue with the charge state of the BU batt (and is there any way to check that state...maybe via a menu, vs. pulling it out and checking it with a meter)?
3. Given that the clock was wrong, could there be something up with Keep Alive that could cause this? Keep Alive is the only piece that goes to the battery, but it is unswitched (CB protected, but not going through the batt switch) and I haven't changed the keep alive circuit wiring, so that steers me away from this as the culprit...but then there is that clock thing!
4. While I troubleshoot this, and until I figure it out, any thoughts on whether I am causing harm to the D-100 if I shut off the Batt master and the EFIS shuts down as described (I can wait the full 30 secs for the EFIS to shut off before turning the batt off, but I'd like to make sure I don't have another issue going on).
Any ideas you guys might have are very much appreciated! Thanks much!!
Cheers,
Bob
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