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T-REX 500 › Shutdown - Please help me!!
04-06-2010 07:20 PM  8 years agoPost 1
v58 fuy

rrVeteran

UK - Kent

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Guys,

Took my 500ESP out yesterday for a quick fly, haven't flown it for a while because of the weather.

Anyway, couple of circuits and loops, no problems. Then returned to a hover and started to do some stationary forward flips.

On the 3rd flip, as the heli went inverted the motor cut-out. I had full control, so managed to get her back upright by continuing the flip, as the heli came upright again - the motor started up again!!!!

After landing and checking all the obvious things, I put the heli back up into a hover (all fine), so then did some straight up and down pitch pumps (all fine).

Went home and checked the battery on my charger, all cells were 3.78V and balanced, battery charged up fine - but now I'm scared it's going ot happen again.

The motor and ESC are all stock Align, can you give me some advice as to why might have caused the motor to shut down?

David

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04-06-2010 10:10 PM  8 years agoPost 2
michael88997

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Lewisville,Tx

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any loose wires or open connectors? was anything getting hot?

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04-07-2010 12:22 AM  8 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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Not in idle up and it took three flips to notice the drop in headspeed??

I literally never use the word literally right.

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04-07-2010 02:42 AM  8 years agoPost 4
knightofcarnage

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chicago

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Sound like your batt might be getting ovrerload.. What brand and C rating are you using?

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04-07-2010 06:36 AM  8 years agoPost 5
v58 fuy

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UK - Kent

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The battery being used was a well used Outrage 25C 3000mah pack, but would this cause a complete motor cut?

I have checked all the wiring and to the best of my knowledge there are no loose wires anywhere.

I think I had a problem with either battery, motor or ESC - but which one and how?

David

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04-07-2010 08:30 AM  8 years agoPost 6
Spitfire1

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Perth Australia

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Due to the onboard BEC, If the esc was at fault or any wiring faulty from the batterry to the esc wouldent this also lead to loss of control also???

Im not sure if its possible for the esc to cut out but still supply power to the servos, but if not then it must be the motor wires or a faulty motor, more likely faulty wires if the motor works OK some of the time, it all depends if the esc can cut motor power and still power the servos or not, I dont know.

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04-07-2010 08:52 AM  8 years agoPost 7
v58 fuy

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UK - Kent

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Spitfire,

I'm not sure either, I've been thinking of all sorts of possibles.

Somebody suggested to me, that when doing flips with poor collective management you are using a lot of pitch (cyclic + collective) could be as much as say 16-18 degrees - could this have overloaded a 'weak' ESC or battery?

But why did I still have control of the heli.

Is there anyway of trying to ground test the problem without flying and crashing it?

David

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04-07-2010 10:03 AM  8 years agoPost 8
Romak

rrApprentice

Scotland

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If the battery is well used as you say and is rated at 25c then, if you are doing 3d flying it may be the esc just doing its job. Protecting the battery against low voltage! Especially if the motor is under a heavy load. There should still be power to the receiver and servos when the motor cuts out. 35 to 40c rated battery may help!
How long are you into your flight when the motor cuts?

Cheers

Rod
14sg....... ;-)

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04-07-2010 10:46 AM  8 years agoPost 9
v58 fuy

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UK - Kent

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On that particular flight I guess I was about 2 minutes into the flight - does the ESC shut motor down if instantaneous voltage drops too low, it's just that I have had my 500 for nearly a year and this is the first time it's ever happened.

After it happened, as I said I put the heli in a hover and then pitch pumped it quite agreesively trying to see what would happen - but nothing did.

David

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04-07-2010 02:13 PM  8 years agoPost 10
Romak

rrApprentice

Scotland

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Don't know if you are using a separate bec device or the one built in to the align esc. If you are, it might be worth trying a separate bec. I have two trex 500's and both of them use separate becs. I use the Hyperion cool 5 amp one. http://www.micronradiocontrol.co.uk/bec.html

Cheers

Rod
14sg....... ;-)

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04-07-2010 05:49 PM  8 years agoPost 11
v58 fuy

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UK - Kent

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Not using a seperate BEC nor have I ever done, so I don't see this as a problem.

David

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04-07-2010 06:05 PM  8 years agoPost 12
michael88997

rrElite Veteran

Lewisville,Tx

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how did you store the lipos? they might need a few flights on them after being stored for a while to get their juice up again... that might be why the esc cut out

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04-07-2010 09:41 PM  8 years agoPost 13
msg73

rrApprentice

NJ

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The exact same thing happened to me when doing a stationary flip. My collective management is spotty at best. I'm using a 60a ESC and my guess is that the spike in Amps caused the ESC to shutdown. I'm probably going to go to an 85A ESC. Does this make sense or am I wasting my money on a new ESC?

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04-07-2010 11:04 PM  8 years agoPost 14
r.s.m.

rrApprentice

Greenville SC

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just my opinion, but not using a seperate bec with 6s will eventually lead to this type behavior, but take it for what its worth

2 chronicles 7-14 "We the People"

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04-08-2010 03:47 AM  8 years agoPost 15
v58 fuy

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UK - Kent

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r.s.m,

Please expand on your theory I'm very interested.

David

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04-08-2010 03:58 AM  8 years agoPost 16
Solmanbandit

rrElite Veteran

Tucson , AZ

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I had a recent problem on my 400 where the motor sounded like it was stuttering flying for a bit and sometimes the esc wouldn't even come on. It turned out to be a bad solder on one or more of connectors going to the motor. Soldered all new connectors and now no problems.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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04-08-2010 04:12 AM  8 years agoPost 17
jones007

rrApprentice

Monterey, CA - USA

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If you still had control of the other channels during the motor shut-down, then it is definitely NOT a BEC problem, as throttle would go to failsafe and the other channels would hold. If it's just the motor dying then the most likely cause would seem to be the pack voltage dropping enough for the ESC to give you a low voltage cutoff. The interesting part here is that all ESCs that I have used require you to go to idle to recover from a low-voltage cut-off, and if you were in Idle Up the whole time, no chance of this. Aside from that, possibly a failing ESC or motor.

--Kevin

Trex 700N, Trex 600ESP, Trex 500, Trex 450Pro

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04-08-2010 07:15 AM  8 years agoPost 18
yank-n-bank

rrNovice

heliville, UT

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My vote is the battery. My 450,s speed control would go into failsafe and would pulse with hard collective inputs, in the first minute of flight...I would land, then take off again and fly "gently" and have no problems. got a new battery and that was that

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04-08-2010 11:33 AM  8 years agoPost 19
r.s.m.

rrApprentice

Greenville SC

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r.s.m,

Please expand on your theory I'm very interested.
good morning, well to be honest i have never had any luck with the align 60 amp esc, everytime i have tried one it has been a nightmare and never could get them to perform right, but if you can get it to work with out a seperate bec that's good.i use a castle 80amp esc on my 500 and the castle puts it in writing that the 80amp cant handle 6s on the built in bec, unless maybe its a high voltage, or maybe a jive esc could handle 6s with stock bec. i actually have burnt up a 45amp scorpion esc on 3s without a seperate bec and thats where i have my experience with esc trouble lol

ps. im not a electronic wiz or anything but i believe an esc can be overamped and shut down and you will still have control of your servo inputs.and that could lead to a burnt esc

2 chronicles 7-14 "We the People"

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