Connecting receiver before turning on VControl behaviour

Hi,

What is the intended behaviour if I happen to connect the receiver without turning on the VControl first. I noticed on my blueline mini vbar it powered the servo in a specific position way out of range for my control surface and it ripped the linkage off. I understand I shouldn't do this but is the servo positions configurable?

/Linus

If there is no radio connection, the NEO´s do not output any signal. It depends a bit on the used servos if they behave correctly. A well designed servo will be just forceless, but sometimes the reaction is sort of random, just what they interpret from the bootup power fluctuations.

so long ... Uli
http://www.vstabi.de

Thanks Uli, reading your answer I did wanted to find out what happened so I put the oscilloscope on the signal wire and there is a small voltage spike just when connecting (before vcontrol is turned on). It didn't look anything like a servo signal but perhaps it was enough to upset the servo.

It is VPlane on a 500g small model, HXT900 servos. So it's easy to rip linkages etc. Good to know nothing is really wrong.

/Linus

Hello Linus,

I did the same, some time back, with the oscilloscope. But no matter how high I upped the resolution, there was nothing signal-wise, only tiny voltage spikes (even somewhat random).

But from experience I know that some servos kind of run to one direction at power up, then re-consider (once their software has booted up) and re-center ... and that's been with all kinds of receivers and radios, legacy VBars etc.
More clever would be, do nothing until there is a valid input, and then (even more clever) do a soft start and go there slowly, like some modern servos do.

Kind regards

Eddi

Born to fly ...
forced to work.