I have been having a low battery if 2 or 3 weeks go between flying. I put an ammeter in series with the battery with everything off there is 65 ma current being drawn. As I pulled the fuses on the battery bus, I found that the keep alive for the D10 is taking 50ma , not the 1ma specified. Is there anything else I can check or change to make this right?
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D10 Keep alive current
- Thread starter dbiddle
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- Mar 23, 2005
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We have heard of isolated instances of this issue when the EFIS is equipped with the internal battery. If you have the internal battery installed, it actually isn't strictly necessary to have the keep alive line connected, as all the keep alive connection does in this case is trickle charge the internal battery. Our internal batteries are a Li-Ion type, which do not really lose much of their charge over time. So even a single flight every few months should keep the EFIS battery naturally topped off when powered up via normal, aircraft master power. If you did not have the battery the keep alive line would power the internal clock, and then you would need keep alive connected. But since you do have the internal battery, it can power the clock indefinitely.
In short, disconnecting keep alive should solve the problem.
In short, disconnecting keep alive should solve the problem.
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Is this unit an EFIS-D10A, and EFIS-D10, or an EMS-D10?
The unit is a D10 Serial ? I can't find the Serial in my paperwork but the Invoice was number 977 dated 2-23-2004. Part number on Invoice is 100114-000
I just came back from the airport and double checked it, separating the keep alive wire to be sure that was the only thing drawing current. It is taking 51.4 ma on the keep alive wire.
I just came back from the airport and double checked it, separating the keep alive wire to be sure that was the only thing drawing current. It is taking 51.4 ma on the keep alive wire.
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One more thing to double check: even without the internal battery, the EFIS will draw some extra power when it is first connected to keep alive, but this should only last minutes. So when you're measuring current as you have been, you want to make sure that the keep alive has been connected for at least 3 minutes before you take your measurement.
If this doesn't produce different results, give me a call at 425-402-0553 and we'll see what else we can come up with.
If this doesn't produce different results, give me a call at 425-402-0553 and we'll see what else we can come up with.
- Joined
- Mar 23, 2005
- Messages
- 13,226
Yes, this is it checking to see if the internal battery needs to be charged.
It's only up at 12 mA for about 1 ms, so the average current draw is still quite low.
It's only up at 12 mA for about 1 ms, so the average current draw is still quite low.