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T-REX 450 › ESC Glitch?
12-31-2009 09:03 PM  7 years agoPost 1
Wahoo

rrNovice

Ocala FL

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I have a stock trex 450 super combo. Jr 8103 with spectrum DSM 9 module and spectrum AR7000 rx. All has worked fine until today while on the ground, throttle hold..It went to full throttle for 2seconds and then to idle (motor off). A few minutes later it did the same thing, but it wasn't in throttle hold. I had just reprogramed the ESC out of slow start mode to normal airplane/glider mode so I can have instant power after bailing out of a bad practice auto. Can't this be done?

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12-31-2009 10:37 PM  7 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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When you reprogrammed, did you use a linear, 0 to 100% throttle curve? If you didn't, perhaps you didn't program it the way you think you did.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-01-2010 04:28 PM  7 years agoPost 3
Wahoo

rrNovice

Ocala FL

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The pitch curve is linear, but the throttle curve is something like 0 20 70 85 100. Why would that matter?

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01-01-2010 04:41 PM  7 years agoPost 4
Pellicle

rrNovice

New York

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The ESC looks at the throttle input during programming. So if you had a flat throttle curve at say 85% for govenor mode then the ESC would see high thottle no matter where the stick was and this would cause the programmed items to be all in high or 3 setting. Your setting may be OK but linear 0-100% is safest when programming the ESC.

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01-01-2010 05:08 PM  7 years agoPost 5
eclipso

rrApprentice

Tucson,Az.

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The likely cuase of this issue is the radio if your esc is performing fine other than throttle hold as the hold feature is only a radio feature that intstantly produces a zero throttle curve and holds it there. also check that your throttle hold curve is set at 0 only in all stick positions.

on another note are you sure that your battery plug in safety feature is on cuase you could be losing signal and your motor is spooling up until the tx and rx reconnect. it is hard to do with the blades and or head on but you can test this by keeping the tx off when you plug in the battery and if it starts then quickly unplug the battery. atleast that will tell you if the safety is on and you can then set it to not power up without tx signal. most rx or esc's are allways this way but maybe not so in airplane mode.

If I can't help you, its probably because you are helping me.

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01-01-2010 05:31 PM  7 years agoPost 6
Wahoo

rrNovice

Ocala FL

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I checked the program settings and they are correct. When programing I did have to position the stick slightly less than half to get the mid stick program mode I wanted.
Why would the battery plug in safety feature cause the motor to go wide open? That makes no sense to me.
Do most trex 450 pilots use slow start?

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01-01-2010 05:39 PM  7 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Do most trex 450 pilots use slow start?
No, only those who don't want to rip the teeth out of their main gears on a regular basis do.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-01-2010 05:55 PM  7 years agoPost 8
eclipso

rrApprentice

Tucson,Az.

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the battery safety feature can cuase the motor to go full throttle in the event that you lose tx to rx connection. I'm sorry im not familiar with your radio but if it is 2.4ghz then it would most likely reconncet after loss of signal and the length of time it takes to do so would depend on the type of 2.4 you use like spektrum or fasst , spektrum being faster than futaba's fasst. but all im saying is that if it were the esc I would beleive that it would do the same thing if you put the throttle stick to zero also so if that doesnt happpen I would consider something to do with the radio. you may try to replace the esc and try it , if it works correctly then it was a bad esc, first I would try setting the esc back to heli mode with slow start and if it still does this then try the other troubleshooting steps I mentioned. the radio would probably be the most expensive component so try to solve the issue in the least expensive order, again if you do replace the esc and set it the same as the other esc and it still does it then there is something else wrong. sorry didn't mean to open up a can of worms just putting in suggestions and trying to be as informative as possible.

P.s. I just noticed that in you org. post it says you had this happen even without having it on thr. hold. I would atleast try to eliminate the battery connect safety as the issue, then go from there.

If I can't help you, its probably because you are helping me.

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01-01-2010 06:14 PM  7 years agoPost 9
Wahoo

rrNovice

Ocala FL

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Thanks for the info. I'll try reprograming to slow start and see how that goes.

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T-REX 450 › ESC Glitch?
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