Technical, Techniques, Hints, and Tips > Radio Equipment
Servo voltages
Tug-Kenny RIP:
Wow. Thank you everyone.
Had a sleepless night, wondering what I had done wrong. I shall revert back to 4.8 v on a separate line.
My only concern was the smallness of the battery, as it goes to the RX, four servos, three ESC's.
Back to the cold shed.... ;D
Cheers...Ken
FullLeatherJacket:
Ken
Don't worry, mate. You can get AA-sized cells over 2 Ah these days (NiMh); that should run your radio for hours. Try Modelpower's website; John could do you a properly made-up pack with plug etc for £not-a-lot. I've used his stuff before with no complaints > suit yourself.
FLJ
HS93 (RIP):
There is no reason why you cannot use SUB c or even D size for receiver packs in SUB c you can go up to 4.4ma and soon even higher
the fly boys use big packs because they runlots of servos and giro's etc Peter
wombat:
Hi Ken,
If you are using the M-tronics viper ESCs, then remove the red lead from the servo sockets, otherwise you will be backfeeding the 6V battery through the BEC driven from the 12V (not sure how the BEC is implemented in the Vipers)
I find a little bit of chatter on my rudder servo, but nothing to worry about. Other than that everything runs hunky dory - can you do a sketch of the layout you have, and maybe a couple of photos - you may have an odd current circulation path in there somewheres (Bane of my life at work). It is amazing just how complicated very simple circuits can get :(
TtW
Tug-Kenny RIP:
Well everyone. I spent 8 hours today on this problem.
The latest situation is as follows. The servos are wired to a 4 cell Nmh battery and work flawlessly.
The Mtronic ESC's are wired direct to the 12volt battery through 5 amp fuses (all the 10amp ones gone till the shops open !!).
The motors are wired direct to the ESC's.
It all works OK until the motor revs exceed half speed. The problem is, when it goes faster. They cut out for a split second and then come on again. ( sounds a bit like a war time motor cycle in a country lane at night ) (don't ask !!)
If I go to top speed, the motor stops and All the ESC's start flashing their lights and the servos chatter. ( This is the bit I'm not keen on !!) Looks great on the oscilloscope.
I have downloaded the Mtronics blurb and saw an item on suppression so I have fitted 1000uF capacitors right at the ESC's. This has increased my top speed to 3/4 until it breaks up, so I am alright until I need top speed. ( any river police about !!)
I reverted to the 6volt battery and it worked fine. This tells me the ESC's are breaking down under the higher voltage. They could well be damaged by now, and the makers will not have them back, as the wires have been cut about a bit. ( the bow thruster motor goes very fast without breaking up, probably because it never was in the original frame of disasters)
I would try it's ESC in place of one of the others, but it's all hard wired in-situ now and I don't want to go through it again.
There were some pics included with this but the server crashed, (story of my life !!), so I'm trying again without them. See later letter if I can get them up and running.
Thanks for listening
Cheer...Ken
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