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Brushed S-90 ESC HELP

Old 04-05-2009, 12:40 PM
  #1  
docsparklin
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Default Brushed S-90 ESC HELP

Lisers,
Recently bought a 3M sailplane (115" WS) at a swap meet that included a Mega FAI brushed cobalt motor and ESC. The ESC says S-90 on it and has nothing else except Battery and Motor labels.
Applying voltage to the power terminals gives me 5.0 V out. When I run that to the Rx, the Rx doesn't work. Unplug the ESC and replace wih Rx battery and it works. ????
Unable to find any info on this ESC doing an internet search and RC Universe search. No idea as to brand, specs, etc.
Anyone out there familiar with this ESC? I am thinking I may have to 'arm' the ESC somehow to get it to spin the motor but I am baffled about the Rx not working with 5V from the ESC but working with 5V from a battery.
Any help???
If need be, any good leads on another 90A brushed ESC?????
Thanks,
docsparklin
Old 04-05-2009, 01:36 PM
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pilotpete2
 
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Default RE: Brushed S-90 ESC HELP

What I find surprising is that a 90A brushed ESC would even have a BEC, I would expect it to be opto-coupled.
The easiest and cheapest fix is to get an external BEC, either from Dimension Eng, or Castle Creations and keep the old ESC, making sure to remove the red wire from the ESC throttle lead to the Rx.
Good luck,
Pete
Old 04-05-2009, 02:11 PM
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docsparklin
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Default RE: Brushed S-90 ESC HELP

Hello again, Pete.
Thanks for the info and suggestion.
Perhaps that was NOT a BEC as I thought, but maybe the lead for the throttle input. Whoops!
I assumed it was the BEC since there was 5V coming out wih 12 V applied to the ESC.
I will try running external power and run the 3-wire connector to the throttle output of the ESC (w/o the red wire)?
docsparklin

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