v twin have i set it up correct

[futuresounds]

Hi Guys,

Im new to the e-revo and rc. I have just finished swapping out my escs and titan motors for the vxl vtwin setup. I have not got my lipos yet but should be ordering them soon. The problem is i have just tried to test the setup using my existing crappy nimms 3000mah 7.2 volt batterys. I ran it for all, of 5 seconds then the low voltage protection kicks in on both motors. I then disconnect and reconnect the batteris and try again, the same thing uccurs. Also when i turn on one esc, the other turns on bu itself as well, i assume that is something to do with the servo y harness as this is the only point where the two system are connected. I am hopping that the problem is with the nimms not giving the appropriate voltage to the escs. Will the Lipos sort this problem out or have i just not set the system up properly???

cheers guys, thanks for your help on this one in advanced. ps i read the faq for the vtwin and am going to get the unslow harness.

[1truckerdan]

first 'you need to dissconnect the red wire on one of the esc's, second you need to turn off the lipo cutoff OFF if you aren't using lipos, third you should use an unslow harness to keep the battires voltages even, and finally you should check out the FAQ at the top of the e-revo section.

[futuresounds]

first 'you need to dissconnect the red wire on one of the esc's, second you need to turn off the lipo cutoff OFF if you aren't using lipos, third you should use an unslow harness to keep the battires voltages even, and finally you should check out the FAQ at the top of the e-revo section.

Hi,

I take it by the red wire you mean the middle one as my esc has white yellow and blue where the blue wire is the low voltage cutoff. what does removing one of the cut off wires do, does that make the second esc a slave ?

I am negotiating an unslow harness and will either be buying one from a member here or be building that myself. As i said i just wanted to test my setup till my lipos arrive, at the mo i got a pair of 7.4 volt 4900mah batteries comming but will probably moving up when i want to go a little faster as i understand that my current setup is limited to 11 volts.

ps i have read the fact repeatidly but i must have missed the red wire thing.

Thanks mate

[1truckerdan]

Yes the middle wire , If you leave the middle wire on both esc's it back feeds the esc's and you'll cause failure of one or both esc's. You will need to turn on BOTH esc's to run.For the fans use the BATT plug port on the rx to power the fans for the motors, and the plugs on the esc's to power the esc fans. You can use 2 11.1v (3s) battires, one for each esc.The lipo cutoff is in the programing in the esc's.

[Chachi_RC]

Yeah, you might check out Larrydino's posts, as I think he may be a good V-Twin guy to use as a reference. I think he has ran multiple V-Twins and knows them well. Sorry that I have no info for you, just thought I would pass along his info. Good luck, and let us know how it goes for you.

[futuresounds]

Thanks guys,

much appreciated. Hope to have some vids up once i got this set up fully.

And thanks for the info, very informative guys.

Sorry one last thing the RX is that the reciever box, do i need to make a speacial connector to fit?

[Suicideneil]

The Rx is the receiver. No special connectors needed as such, everything should be plug and play with regards to fans. Just need to make the Unslow parallel harness- see the FAQ for details.

[futuresounds]

cool, i disconnected the red wire, think i had my wires crossed as i was thinking about the wires running to the motor (you can tell im a noob). but all sorted now and bot even on the nimms this think is quick. Had one big smile on my face cant wait to get the unslow harness made and for my lipos to arrive.

Thanks everyone.

[JaySki]

cool, i disconnected the red wire, think i had my wires crossed as i was thinking about the wires running to the motor (you can tell im a noob). but all sorted now and bot even on the nimms this think is quick. Had one big smile on my face cant wait to get the unslow harness made and for my lipos to arrive.

Thanks everyone.

Be careful.. Being a noob is one thing we all experience.. Testing and being a Noob can cost you $$$ fast... Corssed wires, reversed Polarity even for a second.. or shorting out something will be a FAST way to start burning electronics. Make sure you have everything hooked up right first, and then check it all again, BEFORE testing.

[futuresounds]

I know, I diddnt litterally have wires crossed lol, i was just thinking about the wrong wires. long story. but believe me being a noob it takes me twice as long to do anything. embarrasing as it is to say it took me about 4 hrs to complete everything due to my aprehension to DIY but now i DIM (did it myself) i feel a real sensew of achievement (ok with a little advise from members of the forum lol) I will get there in the end. thanks Jay

[JaySki]

Heya.. Only mentioning some of the obvious.. Cuz I have been there done that.. and there is nothing worse than spending all that time, money, energy to get so close to running it...only to burn something up.. and not be able to play.

[futuresounds]

I hear you Jay.

I messed up an rc heli a few weeks ago just setting it up. while i was just ballancing the rotors etc in the livin room i accidently flicked a switch on the remote contol unfourtunatly it was the flight inversion switch so 0 throttle became full throttle so you can imagine whath happened. by the time i reacted the heli took off and flew into a wall. I was gutted as i was being so thorough. Well at least i know what that switch does now. lol

But for sure the more advice i get the better so i do appreciate it.

Thank Jay

James

[thephilonator]

Yes the middle wire , If you leave the middle wire on both esc's it back feeds the esc's and you'll cause failure of one or both esc's. You will need to turn on BOTH esc's to run.For the fans use the BATT plug port on the rx to power the fans for the motors, and the plugs on the esc's to power the esc fans. You can use 2 11.1v (3s) battires, one for each esc.The lipo cutoff is in the programing in the esc's.

What?

you DO NOT need to 'cut the red wire'. i run a v twin set up in my e maxx and i haven't cut the wire. AND IT STILL WORKS!!! by cutting the red wire on one of the escs leaves all the load of powereing the Rx to the other esc, leaving the red wire connected on both escs just halves the loads that the rx puts on them so each esc only has to use half of the power it would normally use to power the rx.

all that cutting the red wire does is cause one esc to consume more power than the other.

and how is it going to 'back feed'?

[futuresounds]

Ahwell,

I have pulled the red wire already, might have to get another y harness just to test out what difference it makes when my lipos arrive.

should be intresting.

btw, when i had the red wire connected, turning on one esc would make the other turn on and vice versa, is that what is meant by backfeeding?

[Suicideneil]

Probably, but its amussing what some guys say, since they havent done it themselves often. Since the BECS are interconnected via the Y-cable, turning one on activates the other, but it wont make the motors run, only the fans and the lights. Nothing to worry about.