Quick question about twin T-180 escs

[jimbo--jones]

Hi guys.

Building my first twin set up. Its got twin leopard 2000kv motors with twin turnigy 180amp escs.

Problem I'm having is that i need to give a little more throttle to get the other motor started. One motor maxes out before the other one too.

Problem is deffinitely on the esc side of things and not with the motors, as I can swap the motors and it does the same thing.

Both systems are running on their own 4s supply, and there is a y lead connecting both esc signals to the reciever.

Both esc settings are the same, checked with the programing card.


So how do I get both motors to spin at the same time and max out at the same level?

I have calibrated both escs seperately when I first got them. ( Set max throttle on the transmitter).

Is the problem because I'm using two sepperate 4s supplies?

Thanks guys

[Flying Scotsman]

Swap the ESCs first....and then the batteries and see if you get the same results. Also you may have a bad solder connection on the Y harness

Douggie

[Team FFRB]

Esc's

Re program esc's using program box to suit and make sure they are the same.
Remove both red receiver wires on esc's and plug into "Y" harness.
You will need to use a receiver battery pack.
Re program your esc's one at a time to set throttle end points on your radio gear.

Now you should be ready to go.

[BakedMopar]

I always parallel the escs to the batteries. This seams to take that variable of voltage differences away. I also calibrate the endpoints of both escs at the same time.

No need for a separate rx pack. The built in bec works fine for most.

[jimbo--jones]

I always parallel the escs to the batteries. This seams to take that variable of voltage differences away. I also calibrate the endpoints of both escs at the same time.

No need for a separate rx pack. The built in bec works fine for most.

Awesome thanks for the tips guys. This one worked perfect.

Something else seems odd to me. When I power up only on esc, the second esc powers up through the reciever y harness and is also quite capable of running the motor, even though this second esc has no battery connected.

So when I put power to one esc both motors beep and if i give throttle both will run.
Should this even be possible? Im guessing its not too good for my reciever.

[BakedMopar]

If you have both bec wires connected to the y harness you actually powering one esc with the other. Not too sure about why the motor turns unless it's still got power stored in the caps or something. I would not recommend running it like that though.

Could you post a picture of your wiring setup?

[jimbo--jones]

That might have been what I saw and that makes perfect sense now. Im surprised how much power is stored in them caps as the motor turned for some time.
I made some connectors to run both battery packs and both escs in parallel now.
My old man said its quite dangerous to connect lipos in parallel and advised me not to do this. Is it only dangerous when they are at different charge levels or different batteries?
All my bats are the same capacity and brand.

I do not have any pics yet, but these tips are helping me suss it out. Thanks for the tips BakedMopar

[forescott]

You are correct about the lipos. As long as they are identical packs they are safe to run parallel.