Developer Comment by Michael Oborne on December 30, 2011 at 10:15pm

i have some questions? is it always the same esc or chennel output.

the other thing i notice is your feeding all 4 esc powers into the servo rail. usualy there is only 1.

3D Robotics Comment by Chris Anderson on December 30, 2011 at 10:42pm

Well spotted, Michael. Mark: you need to be connecting the ESCs via a power distribution board, which just connects one of their BECs. If you connect all four BECs they're going to fight. 

Developer Comment by Ryan Beall on December 30, 2011 at 10:49pm

Hmm interesting because I'm using the 3DR dist board and am having the same issue

Moderator Comment by Mark Harrison on December 31, 2011 at 3:02am

Michael: different motors; some will work periodically; one always stays off.

Chris: just tried disconnecting the power from three of the ESCs, no joy, symptoms are identical.  (Although now I understand the reason to have power from just one, so that a voltage differential between two BECs doesn't cause a continuous power drain).

I'll make a permanent fix later, but for testing I just made these connectors and put them between the ESCs and APM:

Comment by Vishal on December 31, 2011 at 4:39pm

We've been discussing the issue in this thread. However for me, I already have a properly functioning power distribution board in place which works fine with APM1. 

This workaround of plugging in the board to power first is usable temporarily.  But I think we need a more permanent way of arming the esc's.  This issue never existed on APM 1 so the problem is something with the board or the new code.

Moderator Comment by Mark Harrison on January 1, 2012 at 10:28pm

Yes, the same configuration works well with an APM 1.  Still investigating, hope somebody else might have some insight as well...

Comment by Jeff Taylor on January 2, 2012 at 12:54pm

To others who are seeing the same issue, is it also happening on just one motor? Does it happen on any motor besides motor 2?

Moderator Comment by Mark Harrison on January 2, 2012 at 1:01pm

In my case: it always happens on the back left motor, and sometimes on the back right or front right motor.  The front left motor has never had a problem.  I'll try switching the ESCs to see if the problem is following particular ESCs around.

Comment by Vishal on January 2, 2012 at 2:12pm

uOn my setup, esc 1 arms most reliably but not always. The esc's 3 and 4 arm once in a while. Esc 2 never arms unless I recalibrate it. Even then it only arms once. Then once I disconnect battery power, it wont arm again. I've tried connecting the esc's in different outputs and the problem doesn't seem to go with the individual esc's. Rather, it stays with the outputs.

Comment by dudz on May 14, 2012 at 7:54am

On my Y6 I have 4x Hobbywing 30A esc's, and 2x the same brand and tech but they have two capacitors instead of one (newer model)... I have this issue with the two new model ESC's on channel 5 and 6. In CLI under setup/motors they all spin except these two. I calibrate them again.....same problem, even with connecting the lipo after USB and motors command. If I start up without MP and just lipo to fly, they arm ok.  Am I missing something ?

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