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Electric Motors-Controllers-ESC
Other › Smoked 420lf, maybe the ESC too...on the ground ?????
02-12-2006 04:28 AM  12 years agoPost 1
Verticalvortex

rrNovice

Hamilton, Ontario CANADA

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Hi Ladds
Any response has gotta be a help...
New mx400, Align 420LF, Tower Pro ESC, 2100LiPo
Smoked the spliced jst connector/wire (came with kit)..twice, between the battery and ESC. but just attributed that to small guage for 20+ amps.
Replaced wires with larger current carrier,......then when I had the bird on the ground, above idle a bit, to modify xmitter settings, the motor died, and smoke poured from the motor. No joy after I let it cool, and no familiar beeps from the ESC. With no spares, I can only test the motor for continuity, and maybe o-scope the ESC..?.
Chasing threads on this, I hear that one should not run a brushless less than 80% throttle...is that true?..maybe for cooling??
I am running my Futaba 6xa (not 's' but that is infinitely better than what came with the kit...
Understand I have never even been near another rc helicopter other than display models in the store, with the exception of the Blade CP that I have learned to hover and scootch around the house. so yup...look up the definition of newbie...you'll see my face under it.
Around 40 years of rc big span soaring....so how did I go from mild to wild??? but I'm enyoying this whirley-palmtree way too much
Any input from anyone...all questions or responses taken positively.
Thanks again
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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02-12-2006 05:02 AM  12 years agoPost 2
Rob_T

rrElite Veteran

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smoke poured from the motor
Your motor's toast.

Dont know if the ESC is OK or not.

Brushless ESCs make the motor very inefficient when running at part throttle (more expensive ESCs have better part throttle running than cheaper ones usually). Running at low throttle can make the motor much hotter than flat out- so it might be that had something to do with it, but Align motors are not great quality and some seem to smoke for very little reason. (I have a 420LF in my TRex at the moment and the bearings are going after only a few hours running. A just-go-fly 450TH is on order to replace it).

I wouldn't expect to see JSTs on an ESC or battery for a 420LF- that motor can draw upto about 25A under load. Are you sure everything is rated for that sort of current?

(I'll be flying my "Bird-of-Time" tomorrow in a contest. I also have a Psycho Lite and a few other soarers, so we have something in common.)

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02-12-2006 06:29 AM  12 years agoPost 3
Verticalvortex

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Hamilton, Ontario CANADA

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Hi Rob..thanx for the response.
It became obvious real quick after cooking the small connector and wires that were spliced onto the ESC bat. wires, that connected to the battery, that something was not cosher...and yeah, the jst and wires came with the kit. It is the same wire size that is on the Blade CP....

Anyhoo, I changed them out, and that solved the burning wire problem, but it seemed to have just moved it back to the control, or motor. Will know tomorrow when I check the motor....maybe I can find someone who has the equipment to test the ESC.
Have sent an e-mail to rc-expert, hope they can help.
Going to put myself to sleep with the transmitter instruction manual now.

The classic Bird 'o Time...lots of guys up here have cut their wings with that thing. I've had my share of the two meter and standard birds, but when x-country started (S.O.A.R. in Chicago) I was hooked. Sixteen foot or plus monsters are my bag.
X-C seems to be overshaddowed by the electric cult now, (plus a lot of the gang don't want to chase chutes or sailplanes any more) but to me there is nothing nicer than bare-foot on 200 acres of Kentucky Bluegrass sod, just after sun-up, and launching until the thermals kick in....my drug.!!!!
Best wishes with the contest, let's hear how you did.


Thanx
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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02-12-2006 08:14 AM  12 years agoPost 4
Rob_T

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Which Tower Pro ESC is it? I can find 10A, 15A, 30A and 40A models when I search.

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02-12-2006 02:06 PM  12 years agoPost 5
Verticalvortex

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Hamilton, Ontario CANADA

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Hi Rob...it's the BMC 30 amp. max 40

It got hot, but not so that you couldn't touch it, the plastic shrink tube is still on it, and it doesn't look melted at all.
The receiver is doing its thing, so that part of the circuit seems to be ok, just the motor got real hot.

I'm wondering if a heat sink for the new motor is a good idea?. Though I'm not at the stage of doing much more than hovering, perhaps FF helps cool the motor?

Will have to search what some of the better quality motor and Esc are.

Sure is a challenge
thanx
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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