Having an issue getting Pixhawk Orange Cube to communicate with Flier Model 500 Amp ESCs on my giant Hexacopter. My first setup worked fine with MadX 200 amp ESCs. No problems calibrating or usage. I changed to these Flier Model 500 Amp ESCs and they just beep that there is no signal from the cube. If i cut out the cube, and just run a wire from a Futaba receiver to 1 ESC and power up, it works fine and responds to throttle input, but as soon as i go back to the cube, there is no signal again. Do I need to change the RC Speed parameter from default 490Hz to something lower like 60Hz or something ? Please send help. Thanks in advance 
Does it require 5v PWM signal instead of 3.3v PWM ?
What about in MissionPlanner motor test? Hardware safety switch?
cube is running off its own power source
escs have their own power
hardware safety switch disabled
can’t do motor test because there is no signal
Not the power source. This:
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Ok i will try that here shortly. Thanks so much for the communication
Ok so i changed that parameter to a 1 for 5v and still the same problem, no signal. Why would the esc work normally direct from the Futaba receiver (model R3008SB) and not from the pixhawk?
Ran some tests with multi meter. Futaba puts out @5-6 volts
Pixhawk not putting out any voltage on pins on either 3v or 5v setting in parameters
also saw that the Mad Amp X ESC does not has a positive wire on its lead so this would explain why those worked and not these Flier ESCs.
Any idea why pixhawk is not putting voltage out to main output pins?
The Pixhawk standard leaves the center (Vcc) pin disconnected so you can provide an appropriate rail voltage for peripheral hardware. If your ESCs need voltage on that pin, you must supply it.
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It sure would be fun to see some photos of your hexacopter.
By the way, welcome to the ArduPilot forums.
Edit: Fixed typo.
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thanks yuri, good to know. what is the purpose of the 3v or 5v option in the parameters that DKEMXR mentioned earlier in the thread then?
i appreciate everyones input. Thank you. Will post a pic once its airborne hopefully this weekend
gotcha , i understand now. thank you
Bonsoir , j’essaie de comprendre ce que vous expliquez parce que voila bientôt 1 mois que j’essaie de calibrer mes esc flier opto 300 amp sur mon cube orange + et je ne comprend plus rien je ne suis pas un pro dans la programmation pourriez vous m’aider a comprendre svp? je vous en remercie d’avance
The point being made was about the PWM voltage level required for the ESC’s. But I’m not sure if this was an issue or not. Looking the manual for these ESC’s I don’t see anything out of the ordinary.
ESC Manual