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Bad cap or burned out ESC?

Old 01-28-2013, 10:58 PM
  #1  
jester_s1
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Default Bad cap or burned out ESC?

I am setting up a new Tarot 450 (Trex clone) and went to do the first spin up. I connected the battery and saw smoke and shut it down, then after I couldn't find the source I connected again and spun up the heli only to have it shut down and hear the ESC do it's little startup song again. I found that the cap on the ESC had melted thorugh the shrink wrap around it when I inspected the whole thing again. The ESC was too hot to hold onto. It's an Exceed RC 30amp ESC running an Align 450MX motor. This ESC was on a previous helicopter that had an Esky motor and worked fine.

Once again, smoke upon plugging in the battery (no motor turning yet) and thermal shutdown after 5-6 seconds of part throttle operation.

So would a dying capacitor cause this, or is my ESC probably a goner?
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Old 01-28-2013, 11:00 PM
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Since I'm new here I probably should explain that I've been into RC for 8 years now and am very active on RCUniverse. I did get a chance to check the amp draw in my new system but before it was drawing around 23 amps at full throttle. So the ESC hasn't been over amped ever as far as I know.
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Old 01-29-2013, 01:01 AM
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CHELLIE
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Originally Posted by jester_s1 View Post
Since I'm new here I probably should explain that I've been into RC for 8 years now and am very active on RCUniverse. I did get a chance to check the amp draw in my new system but before it was drawing around 23 amps at full throttle. So the ESC hasn't been over amped ever as far as I know.
on a 450 Heli, you should be useing a 40 amp ESC, the cheapy ESC dont hold up very well, use a 40 AMP Turnigy Plush or Sentry ESC, they have been bullet proof for me. I always try to use a ESC thats 20 to 25% bigger than whats needed to prevent that Magic smoke from comeing out of the ESC Take care and have fun, Chellie
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Old 01-29-2013, 07:24 AM
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Yes, I know about that. 25% is about the head room I had with this ESC. I measure my amp draw on all my electric stuff to be sure I'm safe, although as I mentioned above I didn't get a chance to this time. Considering though I never even made it to more than 70% throttle I doubt I pulled enough amps to burn it up.

So does anyone know if a bad cap will cause the kind of problem I'm having? I can solder on a new one and save some dough if that's a possible cause.
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Old 01-29-2013, 08:39 AM
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Originally Posted by jester_s1 View Post
Yes, I know about that. 25% is about the head room I had with this ESC. I measure my amp draw on all my electric stuff to be sure I'm safe, although as I mentioned above I didn't get a chance to this time. Considering though I never even made it to more than 70% throttle I doubt I pulled enough amps to burn it up.

So does anyone know if a bad cap will cause the kind of problem I'm having? I can solder on a new one and save some dough if that's a possible cause.
Chances are that other electrical Componets of the ESC have been damaged too, and not just the caps, for what a esc cost, its not worth trying to save it, and run the risk of damaging other items like the receiver and servos.
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Old 01-29-2013, 10:13 AM
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+1 on Chellies advise, IMHO its just not worth the hassle of attempting a repair. Even if you did get the ESC to work could you trust it?

FWIW high amps shouldnt blow a capacitor because the current that you measure in the battery wires does not flow through the capacitor. High voltage might do it?
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Old 01-29-2013, 03:41 PM
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It couldn't have been a voltage issue because I'm using the same batteries. I guess this is just one of those random failures that happen sometimes. It's just really weird to me that the ESC does still work and will still run the motor, but just heats up fast and shuts down.
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