Dear Y6 Owners and other DIYDroners,
I am looking for some help.
Ever since installing 3.2 on my Y6B I have had intermittent failure of motor No.6. Always no .6
Ah, "It has to be an ESC or Motor" I hear you all say, I thought that as well. Here is what I have tried so far and I am getting boarded and would like to get it back in the air and get on with other things.
1: Replaced 3DR ESC with a completely new 3DR ESC. No change, motor will run up fine and then lose sync.
2: Replaced Motor No.6 with a completely new motor, including all wires. No change.
3.Swapped ESC/motor No.5 for ESC/Motor No.6 to see if the problem would move. No change, still Motor no.6 faulting intermittently.
4: Just for laughs and because it was the only thing I could see that was physically different on RC Out 6 I moved the Ground/Power connected to a different port. No change, as expected although the problem did get a little less frequent at first.
5: Replaced Pixhawk board for a brand new one from 3DR. It seemed better at first but alas, it was not to be. I guess that is the problem when you don't know what is happening and can't actively cause the issue.
So I have replaced or swapped everything except the power distribution board which I have check for dry joints, continuity and measured resistance to confirm that all connections are good, solid and working correctly. So I doubt it is the power distro board.
6: Reverted to 3.1.5 and all seems fine. Back to 3.2 and it did it again.
7: Raised THR_MIN as I also noticed that after running motors for a while and closing throttle then some motors would stop. This does not happen on 3.1.5. All motors Idle fine but the Motor No.6 sync issue has not changed at all.
8: Connected ESC/Motor No.6 directly to Rx. All Good.
Attached is the latest log of the fault happening on the bench, I can't fly as I don't trust it will stay in the air and I won't fly it until I get to the root of the problem. Can anyone help me find the cause. I have logged a problem with 3DR help but so far no reply. This is a stock frame and all stock electronics which had been fine on 3.1.5 and I can DEFINATELY say that reverting back fixes this issue.
I am confused as my other machines work just fine with 3.2 and I really, really want to get it working on my Y6B
Can anyone help me with the log below, I see the motor drop and others responded as expected but there is also a very steep RC Out drop on Motor5, RC.3 in is stable and power looks fine to me.
Thank you for your help and I hope that this might go some way to fixing any other sync issues out there. I see there are a couple of post with Hex/Y6 Motor No.6 failures although I find it hard to believe it is a bug as it is not affecting everyone.
Thanks in advance,
Alex
Replies
For me it was an (intermittent) break in the signal wire between the Pixhawk and the power distribution board on one channel. I now wire all of my ESCs directly to the Pixhawk from the ESCs and bypass the PDB altogether.
Hi Brendan,
I am sure that connecting all of the power wires is OK as the 3DR ESC's have linear BEC circuits but I was wondering if you connected all of the power cables or just one? The PDB connects all of the power together. As far as I can see it is just a straight connection between all of the ground pins (bottom row) and the same for power pins (middle row). Signal wires are 1:1 and I cannot fault these through the PDB although once I dug out the hot glue I did notice that a couple of connectors were not all the way home, these had not caused any issues.
Is this by chance a 3DR RTF Y6? does it have a 12 V Regulator? I had a similar issue and it turned out the regulator was affecting the motor some how. If it does have a regulator can you try to remove it and try again?
Hmm. I have a 12v regulator on this new Y6 (not Y6B); will remove it if sync issues are present on the bench.
Thanks for bringing that up.
Here is the log, problem t about line 24300
2014-12-12 10-27-09 17 Motor 6 fault bench test.bin