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motor is spooling up if i plug in with a gov speed selected.


P.I.Engineer
(@p-i-engineer)
Active Member Customer
Joined: 2 years ago
Posts: 15
Topic starter  

workflow:
radio on, gov speed 1 active
plug in heli
get esc arming tones
motor spools

this was discovered by accident while testing failsafe and didn't realize that i didn't have throttle
hold on.
my flat throttle values are
40%, 65%, 90%

archer-rs
align 130a esc with telemetry set to airplane mode

 

side issue: i tried using the support request in the application and it would not send.

"error during support request failure sending mail"

 


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BrainDev
(@customercare)
Member Admin
Joined: 4 years ago
Posts: 792
 

Thank you for the report,

Models should never be turned on before the transmitter is on and if the Throttle of the transmitter is not at zero (or in Hold). Unless you want to put the ESC into programming mode but then the Throttle must be at 100%.

To prevent this from happening due to distraction, at power-up the transmitters emit a voice warning (or sound the cheap ones) that the Throttle is not at zero. Some more advanced transmitters have an actual pre-flight checklist.

In addition to transmitters, ESCs also have a lockout that prevents the motor from starting if the Throttle signal is not at zero at the time of power up, and they will only engage if the Throttle signal is brought to zero.

However, if the transmitter is still off at the time of powering the model or if the transmitter after powering the model is turned off and on again the receivers and/or controllers activate the Fail Safe state which for safety brings the Throttle to zero and this triggers the ESCs.

This function allows the motor to restart if a momentary interruption of the radio signal and/or a momentary interruption of receiver power occurs in flight.

In the submitted log, numerous momentary power failures of the receiver, servos, and controller are visible. This could be caused by the Recorded Log memory being fouled during a firmware update and not reformatted immediately after the update (we suggest re-initializing and formatting the logs memory anyway using the red "Erase Logs Mem." button).

immagine

However, there are also visible in the Events numerous red #156 "Voltage <= 4V3" events that should never be present because they can cause malfunctions or even resets of the receivers, servos and controllers and that confirm what we see relative to the "Servo Voltage" curve in the Flight Log graph.

immagine

So as the first and most important thing you need to understand what these severe power sags/disruptions are depending on.

Check the crimping of the BEC connector leads and that the connector is inserted all the way in and does not move due to model vibration (stop with hot glue). If the ESC has an auxiliary BEC output make sure it is connected. Verify that no wires may be momentarily shorting to an edge of the carbon chassis against which it may have stripped.

This intermittent power supply could be the cause of the motor restarting.


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P.I.Engineer
(@p-i-engineer)
Active Member Customer
Joined: 2 years ago
Posts: 15
Topic starter  

thank you for review, that power fluctuation was the servos going nuts during log download.

the 4.3v is usb power not bec

i believe both these issues were called out in the latest release. (which i have updated to)

 

to clarify the issue. if i plug in with gov position 2 or 3 active, i get constant "throttle not low" beeping. But on gov position 1, i get boot up tones and motor starts. From a safety standpoint, getting a constant beeping  "throttle not low" is how i'd expect it to function. Why is there a difference between position 1 and 2/3? I discovered this by accident and don't want anyone else to be surprised by it. Don't most esc's function this way? they won't arm if throttle is not low?

 


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P.I.Engineer
(@p-i-engineer)
Active Member Customer
Joined: 2 years ago
Posts: 15
Topic starter  

did some more experimenting.

i swapped to sbus and tried to get it to spool up while plugging in, i could not.

i then went back to f.port and could not get it to spool either.

so far i'm unable to repeat the issue. I'll ping this thread if i find something out. 

thanks for the time,

-Jarad


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BrainDev
(@customercare)
Member Admin
Joined: 4 years ago
Posts: 792
 

As already explained, to reproduce the phenomenon, simply turn the transmitter off and on again or turn the transmitter on after powering the model.
It is likely that one of these two things was done without realizing it.
Or if the transmitter was held too close to the receiver, an erroneous fail safe may have occurred due to radio signal saturation.

We consider this support request thread closed for now.

Side note: 4.3V is not the 3.4V of the Events. When the flight control unit is powered from the USB connector, there is no voltage on the "Servo Bus" (front connectors). Therefore, it is impossible for the servos to move causing drawdowns of the USB supply voltage.


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