Ncpx brushless conversion problem

[faisalnawazkhan]

i have 2 oversky xp -7a plug n play by oversky

downloaded the latest BLHeli 11.2.0.7 , flashed the esc with changes in variables as advised

"Flash the ESC with 11.2 Main code, set both gains to 2.00, everything else default, run flat throttle curves 75% or higher ."

But no luck , as i raise the throttle , tail rotor moves but at 1/4th stick movement blue light on board goes off , servos jerk up a little and then turn on after 2-3sec but no motor movement or beep sound either. what yo do next , kindly advise

waiting anxiously for ur reply

[NCcraig]

Where are you taking the signal for the ESC from on the 3-n-1?

[faisalnawazkhan]

yes , i am taking the signal for ESC from 3-in-1 (main motor port)

[faisalnawazkhan]

[NCcraig]

I think that may be part of your problem. I have always taken the signal from the leg of the main motor FET on the front of the 3-n-1 or from the resistor taps on the rear of the 3-n-1. If you take the signal from the front of the board, you need to change the input polarity to negative in the BLHeli software.

[faisalnawazkhan]

thank u for the reply ,
1. i have tried to change the polarity to negative but still no brushless motor response .

2.then as u wanted me to check if the stock motor runs , i did , i does nt , the 2 pin motor port neither runs main nor tail motor when plugged in it.

3.its a brand new board tested before doing the mod .

4.i have removed the yellow wire also and also the whole xp-3a wiring nd ESC itself from the 3-in-1, still no luck .

5.the servos and tail motor port works , main motor port does nt work . what to do . attaching pics , kindly have a look.

Thank u

[NCcraig]

What is connected to the right hand side of the ESC in the second picture down?

[faisalnawazkhan]

hi , i took off the wires from xp-3a , one was nt removed when i took the pic , which can be seen in 2nd pic

[faisalnawazkhan]

i took off the wires from xp-3a , one was nt removed when i took the pic , which can be seen in 2nd pic

[NCcraig]

Unless you damaged something soldering the signal wire to the leg of the FET, the signal location you used should have worked once you reversed the input polarity. I guess you could try picking up the signal from the back of the board and see if that works but that may be a bit more challenging to solder.