ESC not letting power and signal trough to motors

[Jensieboy56]

Hi,

I'm building my first quad and ran into a problem. I got everything hooked up, soldered properly, but when I connect my battery and give an input on my transmitter my motors won't move. When I go into betaflight I see the inputs that I'm giving on my transmitter but nothings happening. I also set up my arming switch so that's not the issue.

When I measure the voltages on the flight controller end I can see that a signal is given but when I measure the voltages at the motor cables themselves I see nothing. They're not even getting power. I can't seem to figure out why I measure a positive voltage on the flight controller side of the ESC and nothing on the motor's side.

If anyone knows what to do and is willing to tell me, Thank you in advance.!

Greetz,

Jens

 

[wafflejock]

You can use the motors tab in betaflight to take the receiver out of the equation. Regarding measurements know an oscilloscope would see high speed ac like pulses that the esc puts into the motors but not sure how a voltmeter would react but I also haven't really tried testing an esc without a motor connected.

You may just need to have common gnd between the FC and pdb if you don't already, I've had signals floating all over the place when no common gnd, also can make sure to calibrate the ESCs, basically battery disconnected on motors tab raise to high value (motors attached but no props) plug in the battery, wait a second hear some startup beeps from motors, drop throttle in motors tab to 0 hear confirmation beeps. Now the FC and ESCs agree on 0-100% throttle.

 

[Jensieboy56]

You can use the motors tab in betaflight to take the receiver out of the equation. Regarding measurements know an oscilloscope would see high speed ac like pulses that the esc puts into the motors but not sure how a voltmeter would react but I also haven't really tried testing an esc without a motor connected.

You may just need to have common gnd between the FC and pdb if you don't already, I've had signals floating all over the place when no common gnd, also can make sure to calibrate the ESCs, basically battery disconnected on motors tab raise to high value (motors attached but no props) plug in the battery, wait a second hear some startup beeps from motors, drop throttle in motors tab to 0 hear confirmation beeps. Now the FC and ESCs agree on 0-100% throttle.

Hi,
The ground between FC and PDB are common I made sure of that when I soldered everything together. Tell me when I'm wrong but don't the motors have to get power when the battery is connected and you hear the 3 beeps of the ESC's booting up? The motors aren't getting any power and signal input when I give an input on my transmitter.

 

[GJH105775]

Hi,
The ground between FC and PDB are common I made sure of that when I soldered everything together. Tell me when I'm wrong but don't the motors have to get power when the battery is connected and you hear the 3 beeps of the ESC's booting up? The motors aren't getting any power and signal input when I give an input on my transmitter.

Have you tried either the motor slider in betaflight or plugging the receiver directly into the ESC? It might not be arming for some reason (for example throttle input not showing zero, or some other safety).