Safety Link/ Links

Whoaaa !!!!!(recommendation goes over my head )!!!

As long as the bloody thing works i will be happy..As many of you that have seen my bots..they always look good but never work properly. :lol:

Cheers Froggy

Depending on how your speed controllers are wired internally, you might end up letting the magic smoke out!

The negative supply of M1s speed controller is 12V higher than the negative supply of M2s speed controller. If the black wire that goes from your speed controllers to your receiver is also connected (internally) to the negative supply to the speed controller then both negative supplies will be connected together, via the receiver.

If the black wire isnt connected to the negative input then you dont have a problem, but if it is, somthing will have to give, probably a pcb track in one of your speed coontrollers. I thought you might want warning :-)

Ill check my electronizes later when I get home to see if they have signal ground connected to their negative supply but I think the IFI victors have them connected and some other ESCs do.(http://forums.delphiforums.com/n/mb/message.asp?webtag=THERFL&msg=3706.8&search=yhttp://forums.delphiforums.com/n/mb/...3706.8&search= y)


Hope this helps

Hi Mark

Thanks for warning info....I will be using standard 15a elecronize speed controlers in this bot so look forward to hearing your findings.

Cheers Froggy

Ive just checked my 30Amp electronizes and the negative supply from the battery to the speed controller is connected to the black wire to the receiver.

Assuming your 15A ESC and 30A ESC in your wiring diagram are all electronizes, I think you might have a problem.

Possible solutions (off the top of my head, might not be practical):
1. Use an optoisolator between the receiver and the ESC.
2. Modify the ESC pcb to remove the connection
3. control the ESC using a mechanical connection (servo driving a pot or similar)
4. use two receivers (electricaly isolated)
5. use relays instead of ESCs
6. use ESCs that are already isolated.

Simplest solution is probably to get an optoisolator. The only ready made solution for RC I can find is the zero glitch module (£8.99) sold here: http://www.goldstarstockists.com/tamiyaparts/tpx/electronicgadgets.htmhttp://www.goldstarstockists.com/tam...nicgadgets.htm
I wouldnt have thought its too hard to build your own using a cheap IC though. Somebody else whos had a go at this could probably chip in with some advice here.

Hi Mark

Well it did look good on paper !!!!:lol:

1) Use an optoisolator between the receiver and the ESC. .....£9.00 for each ESC....£36 total...
2)Modify the ESC pcb to remove the connection ..then would have to have seperate bat pack for rx
3)not practicle
4) same as 2)
5) this is for a high speed spinner bot so need all control i can get
6) got to use what ive already got

Might be cheaper and easier to run 24v gold as opposed to 12v drill motors....or run drill motors at 24v and smell the smoke !!!

Cheers Froggy

I just thought - some people have had success with running 12V motors on 24V, but using rate limiting in the radio so you can only get a maximum of 50% throttle. Its still harder on your system than running it on 12V but it does reduce motor heating.

Might save you from frying your motors.

Hi Froggy
Or you could do what I have done in DragonStrike. One circit for the drive and a different 1 for the weapon.

Hi Big Tone and all

i remember you showing me dragonstrikes circuit at leicster with its 2 circuit design....if i was using 6 x 12v 800ma batt packs what would be best configuration....ie...4x12v paralled for drive 2x12v series up to 24v for disk.. or 4x12v series up to 24v for disk and 2x12v paralleled for drive..
in other words which would take most power to run ..drive or spinning disk ???(drive being orrible lil 9.6v woolies type drill motors)

Cheers froggy

Hi
On DragonStrike I use 2 x12v 3300 in series for the disc and 2 x 7.2v 3000 in series for the drive.

Hi again
The Disc takes the most power on DragonStrike it just about lasts 1 fight but the EV at 1-1 does suck power. The drive will do 2 fights before i need to charge them.