Discussions

Motors beeping after change to PPM-Sum

Posted by jjohow on January 27, 2013 at 4:32am

Hi there,

I have a Graupner MX-20 which supports PPM-sum on Ch8. I wanted to get rid of too many cables on my RX. So I changed to PPM. I did it like shown in the Wiki, bridged signal Pins 2+3 on my APM2.5 and fed the PPM-Sum to Ch1.

In the mission planner everything seems normal, I did the radiocalibration and everything seemed to be normal.

But now, when I power up the APM2.5 board with the battery all motors start beeping (continously twice a second). I recall having heard this beeping sequnece when the ESCs are not connected.

I really dont get whats worng here?!

Any ideas?

Thank you very much!

Joerg

You need to be a member of diydrones to add comments!

Join diydrones

motors, ppm, after, beeping, change, sum, to

Email me when people reply –

Replies

Gregmaan May 1, 2013 at 11:09pm
Did you change the chanel mapping for the MX 20? You must change some channels to so that they fit to the APM:
- CH 1: Roll Left = low PWM – Roll Right = High PWM
- CH 2: Pitch Forward = low PWM – Pitch Back = High PWM
- CH 3: Low Throttle = low PWM – High Throttle = High PWM
- CH 4: Yaw Left = low PWM – Yaw Right = High PWM
- CH 5: Flight Mode
- CH 6: up to you
- CH 7: not engaged = low PWM – engaged = High PWM
M3one May 1, 2013 at 2:18pm

You don't need any bridge on the APM2.5. Remove it and should work
Darren January 27, 2013 at 6:42am

It kind of sounds like the esc's are in programming mode instead of arming.

That happens when the throttle isnt low enough in order to arm the esc's. (so they go into programming mode automaticly, and uses the throttle position (High-Mid-Low) for menu navigation and choices based on the beeps.)

Try performing radio and motor calibrations again to see if you can correct that.