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Motor Cuts Out

Old 04-12-2020, 04:50 AM
  #1  
rc727737
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Exclamation Motor Cuts Out

Hi guys. Iíve been out of RC stuff for a few years now and just decided to start up again.
I have a Spektrum DX6i transmitter. I have a couple of Specktrum receivers that had previously been bound to certain models from a few years ago. Anyway, I have a couple of motors I wanted to hookup to see if they run.
I hooked up one motor, and when I advanced the throttle on the DX6i, the motor ran but cuts out and cuts out altogether at any point where throttle advancement is stopped. I tried my other motor and it did the same thing. So I tried different escís, different batteries, and different receivers all with the same results. That would lead me to believe that itís the transmitter itself.
Is there anything I may have missed or does anybody have any other ideas? Thanks!
Rick
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Old 04-12-2020, 09:11 AM
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quorneng
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rc727737
From the tests you have done it certainly sounds like the Tx is at fault. I would also use a servo tester to run the ESC and motor just to be sure they worked.
Then use the DX6i "monitor" function. This display shows what signal the DX6i thinks it is sending on each channel. If the throttle display bar is not travelling smoothly in line with the stick movement then it is most likely the stick variable resistance 'pot' has failed. Not simple to fix as it is completely built in. You may be able to find a complete stick module which is fairly easy to replace.

I have this problem but it is on the rudder pot so that DX6i is relegated to flying simple "bank and yank" planes!
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Old 04-12-2020, 08:26 PM
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ron_van_sommeren
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Connect a servo to the throttle channel and see what it does when you advance throttle.
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Old 04-12-2020, 08:56 PM
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RideTheLightning
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Be sure the end points for the throttle channel are set at 100%. I’ve seen ESCs act weird when the input signal is not at the full range.
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Old 04-13-2020, 05:30 PM
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Wildflyer
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Plug you ESC into a different channel and see how that acts.
Use the elevator channel but PLEASE fasten a rubber band to hold the stick down as if it is the throttle stick.
Then do your test.
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Old 04-14-2020, 12:15 AM
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rc727737
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It moves erratically.
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Old 04-14-2020, 12:17 AM
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When I connect a servo to the throttle channel and advance the throttle, the servo moves erratically.
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Old 04-14-2020, 12:20 AM
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Throttle end points are set at 100%.
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Old 04-15-2020, 02:03 AM
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skyhawk940
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remove the back of the transmitter and spray contact (electronic cleaner) into the stick pots. Had the same problem with my DX6I. Worked like a charm. I will clean mine every year now. The pots are of open design and get dirty. Don't worry about the spray, it won't hurt anything if it gets on it.
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Old 04-15-2020, 04:17 AM
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Thanks, I’ll give that a try!
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Old 04-15-2020, 03:40 PM
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ron_van_sommeren
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Originally Posted by rc727737 View Post
When I connect a servo to the throttle channel and advance the throttle, the servo moves erratically.
And do you get full throw, the throw you would expect?

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Old 04-15-2020, 05:04 PM
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Yes, I get full throw.
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Old 04-15-2020, 05:52 PM
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quorneng
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I am pretty sure an ESC will not respond to an instant signal cut out as a servo would.
The ESC will react instantly to an signal interrupt and cut out. When the signal returns at more than the minimum throttle level the ESC will not respond as a safety feature. An ESC will only 'arm' at a minimum throttle setting
Cleaning the suspect pot to ensure it makes continuous contact is the only answer.
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Old 04-20-2020, 02:33 AM
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Ended up taking the back of the transmitter off, blowing on the throttle pot, and brushing it with a very fine haired paint brush. Works great now!
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Old 04-20-2020, 02:32 PM
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Do that at the beginning of every season. Mine took out a plane two years ago.
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