Suppo 10A esc help please

[michaelj_00]

Thanks guys and gals for having a great forum. I've been lurking here for some time, but now I need your help. I searched but couldn't find my answer.

My kids and I built a tiny trainer using some of the recommended electronics. I'll include the links to the components so there is no confusion on what I am using.

When I program the esc to lipo mode the following electronics combination cuts the motor off after about 3 seconds.
For testing I've used two different motors, two receivers, and three batteries. They all make this esc do the same thing. (I only have one esc so I can't compare the esc.) Transmitter is a Dx6i if it matters.

If I add servos to the combination they still function after the motor cuts off.

Suppo 10A esc
http://www.altitudehobbies.com/brushless-esc-bec/suppo-brushless-escs/suppo-10a-brushless-esc

Turnigy nano-tech 2c
http://www.hobbyking.com/hobbyking/store/__11896__Turnigy_nano_tech_460mah_2S_25_40C_Lipo_Pack.html

Emax 1806
http://www.banggood.com/EMAX-MT1804-2480KV-Brushless-Motor-For-Multirotor-p-933933.html

OrangeRX 615x receiver
http://www.hobbyking.com/hobbyking/...MX_Compatible_6Ch_2_4GHz_Receiver_w_CPPM.html

What is strange is if I hook up a 3c 800mah the motor works just fine.
http://www.hobbyking.com/hobbyking/..._Lipo_Pack_E_flight_Compatible_EFLB0995_.html

Is this esc just not compatible with these batteries and if so why not? They are the recommended batteries by flite test.

P.S. if I run the esc in NiMh mode these batteries work just fine.

Thanks,
Michael

 

[pressalltheknobs]

Sounds like you have programmed the lipo cutoff for 3S rather than 2S. Generally you don't want to program the lipo cutoff for airplane use but use a timer on your TX or and/or a battery alarm on your plane.


https://store.flitetest.com/battery-voltage-alarm-1-8s/

So I would disable the Lipo cutoff and get an alarm.

If you don't have one you will need to estimate how long the battery will last and use a timer. A bit difficult the first time. Just estimate short and periodically measure the battery and accumulate the flying time until the cells are no lower than 3.5v a cell. Then you will have a good idea of your max flying time.

 

[pressalltheknobs]

Well looking at the manual it doesn't have a way to disable the cuttoff. In LIPO mode it is supposed to auto detect 2S and 3S. It can only do that by taking the combine voltage determining it is enough for a 3S or enough for a 2S. Then it will cut off at either 8.7v if it saw a 3S or 5.8v if it saw a 2S at startup

So what may be happening is that the NiMH is still set and since it can only see the full voltage and estimate the cell voltage it is getting confused when you give is a 2S. Would have to do some arithmetic to see if that is feasible.

Another possibility is that you 2S battery has a bad cell or is not fully charged.

 

[michaelj_00]

Yeah, there is no way to manually change the cutoff.

The three batteries I'm using all test fully charged and balanced.
All three batteries though do the same thing.

Maybe I just got a faulty esc.

 

[pressalltheknobs]

bit of a strange failure mode since it seems to work with 3S

I assume it's making the correct "lipo" beeps like in the video on the Altitude page (at between 12 and 14 mins).

The only other thing I can think of is if the ESC is not getting the full voltage from the battery for some reason - a bad connection somewhere. If you have a volt meter you could measure that and make sure

Otherwise I would contact Altitude hobbies if that is where you got it and see if they can help.

 

[michaelj_00]

Thanks pressalltheknobs.

I'm configuring it just like the video. Watched it several times just to be sure.

I just sent a email to Altitude Hobbies. That is where I purchased it from.
Hopefully they can guide me where I need to go.

 

[quorneng]

My first reaction was not the issue of the cells but rather the low voltage cut off.
Do you know how many amps the motor is drawing?
If it anywhere near 10A it could be drawing the voltage down on as your 2s 460mAh battery such it drops below the LVC. The motor then stops but power remains on the controls.
Does it do the same thing with no prop on the motor?

 

[mjmccarron]

It sounds to me like voltage sag caused by the battery not being able to meet the current demand of the motor. It works with the 3S because it has a lower internal resistance and therefore less voltage drop. That battery is very optimistically rated at 20C. try a 2S 500 with a bit heavier wiring. does it run at part throttle?

Mike

 

[michaelj_00]

Quorneng Does it do the same thing with no prop on the motor?
Yes, even with no prop it still cuts off after three seconds.

Do you know how many amps the motor is drawing?
No, I don't have a way to test the amperage. I can say it does it on both an emax 1804 and 1806.
I purchased the setup because it was recommended by Flite Test for the mighty minis.

does it run at part throttle?
Unfortunately, no matter how little throttle I give it, it still cuts off at about the same time.

Try a 2S 500 with a bit heavier wiring.
Being new to the hobby, the only other style of 2c battery I have is currently residing at the top of a large pine tree.
The 3c batteries I have are just too heavy for these mighty minis.