Motors start spinning on power-on

Hardware Multirotors
1

Hello,

I have been experiencing some strange behaviour on my copter when I connect the battery.

It happens once in a while, that when I power on the copter the motors start spinning with random changes in rpm. I ignored it the first 2 times, and a power cycle fixed the issue but yesterday I nearly damaged my hand due to this issue.

Hardware being used:
Cube orange with airbot carrier board
Tmotor integrated motors (P80-X（Integrated Propulsion System） - X-Agricultural - T-MOTOR The Safer Propulsion System)

Note: I feel like the issue may have something to do with the anti-spark connectors on the batteries. Maybe a slow connection process of the batteries cause a gradual increase is supply voltage to the system, that somehow initiates signal to the Tmotor integrated propulsion motor/esc config?

I’m not an electrical engineer, so if anyone has experienced anything similar or could give some input that would be great!

2

Yes, we have got one similar experience.

two pilots
two remote controller
two quard
the same passcode for receiver
within the short range of RC signal range

Now they got something dramatic happened. They powered their drone, and first guy thought it’s OK got connect the drone, arm and lift off the drone with acro mode. Actually he connect the another guy’s drone.

Very dangerous!!!

I hope it’s NOT your case.

3

Hi,

Thanks for your input.

I have eliminated the possibility of it being interference from the RC signal. It seems to be something happening in the booting process of the ESC/Cube/system

4

Hi @MarcusL
Cubes or even Ardupilot generally dont have that issue, although there could be some parameters causing it.
Please supply your full parameter list as a file you can attach here.

Or a .bin log file created by setting LOG_DISARMED = 1

5

I don’t think “anti-spark connectors” and “slow/quick connection process of the batteries” will cause kind of this issue.

Did you configure flight mode to “Throw” mode? But … … I don’t know… maybe you can check that.

It’ll spin when you throw the drone.

https://ardupilot.org/copter/docs/flight-modes.html#flight-modes

6

Anti-spark connectors are OK, but you do need to take care to connect them fast and fully push them in in one go.

If you do not push them fully in in one go, the voltage drop on the connector will cause strange effects.

Was this vehicle tuned with MethodicConfigurator/QUICKSTART.md at master · ArduPilot/MethodicConfigurator · GitHub ?

Two of our customers also uses P80-X and we tuned it using the tool and got great results. Customers were pleased.

1 Like
7

Does your methodic configurator tune the boot sequence? :joy:

It’s a great guide, but surely not relevant with this issue.

8

If you provide your full parameter list we may be able to tell what’s wrong, there are some misconfigurations that can cause ESCs to spin motors at inappropriate times.
The methodic configurator takes away the common causes of that and many other issues if followed correctly.

9

The guide tells you how to properly configure the esc firmware inputs and the FC to esc outputs. If that is not relevant, I do not know what is.

Please address the anti-spark connection procedure first and the potential configuration issues before continuing to debug this.

1 Like