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Strange problem with throttle with CC25 ESC

Old 12-23-2006, 03:35 PM
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millerhill
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Default Strange problem with throttle with CC25 ESC

I've recently changed some servos on my Slow Stick and reconfigured my CC25 ESC, but now it will only go to 1/2 throttle...about 4.5A. Even when I push the stick all the way up, there is no change in RPM beyond 1/2 stick. I'm using a 3C lipo and it shows 11V so that's not the problem. I re-configured the ESC twice and used the "auto detect" for full throttle setting. What's the problem?
Old 12-23-2006, 03:47 PM
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exeter_acres
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Default RE: Strange problem with throttle with CC25 ESC

what size battery...?


3 cell lipo doesn't matter... it is the mAh capacity that does...
Old 12-23-2006, 05:44 PM
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Default RE: Strange problem with throttle with CC25 ESC

You mention your lipo shows 11V. Is that the resting voltage or did you measure it under load with the motor running?

The resting voltage of a freshly charged 3S lipo pack should be around 12.6V. If it's much lower than that, either the pack is defective or the charger isn't doing its job.

- Jeff
Old 12-23-2006, 07:49 PM
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Default RE: Strange problem with throttle with CC25 ESC

It's a 2100mah battery.

Hi Jeff,

That's the resting voltage. It started out around 12V. I think the battery is ok cause I tried another one and the result was the same. I also tried another ESC and the result was the same. I checked my TX thinking that maybe I had end points set weird, but no luck. Now I'm thinking that maybe the motor has a problem, but you would think that it would either work or not work. I've never encountered anything like this...

Steve
Old 12-23-2006, 10:46 PM
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Default RE: Strange problem with throttle with CC25 ESC

Hi Steve-

What's the battery voltage fresh off the charger? It should be very close to 12.6V.

In any case, it is odd that the problem began after changing servos, with everything else remaining the same.

- Jeff
Old 12-24-2006, 08:15 PM
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Default RE: Strange problem with throttle with CC25 ESC

Voltage off the charger is 12.46V

Old 12-24-2006, 08:57 PM
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Default RE: Strange problem with throttle with CC25 ESC

Hi Steve-

So the resting voltage is OK.

At this point, I think I'd disconnect all of the servos and see what happens with only the motor connected. If the problem has something to do with the servos, this would be one way to find out.

- Jeff
Old 12-24-2006, 09:19 PM
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Default RE: Strange problem with throttle with CC25 ESC

Good idea. I'll give that a whirl. Thanks

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