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XHELI.COM . Autography FlightPower . Advantage Hobby

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e-Align T-REX 250-450-500-600 > T-REX 500 BEC scolding hot?
 
 
ckombo
Heliman
Location: Boston, MA USA

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Setting up my new TREX 500 and im new to electrics.

Is the BEC suppose to be super friekn hot after being on only 2 minutes?
10-31-2009 09:23 PM
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eggmcmuffinplz
Elite Veteran
Location: Los Angeles, CA

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The BEC built into the stock ESC? No.

Scott D
Logo 500 3D V-bar
10-31-2009 09:25 PM
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ckombo
Heliman
Location: Boston, MA USA

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no a seperate BEC. I am using a Hercules
10-31-2009 09:35 PM
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Ben-T-Spindle
rrProfessor
Location: Central Illinois

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I agree; the Hercules BEC is the way to go.

... BTS
10-31-2009 11:18 PM
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ckombo
Heliman
Location: Boston, MA USA

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but does it get hot?
11-01-2009 01:30 AM
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dkshema
rrMaster
Location: Cedar Rapids, IA

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Did you disable (disconnect) the BEC output of the ESC you're using? Remove the red wire from it's connector if you're powering the electronics off a separate BEC.

Super hot ("scalding", not "scolding" ) would indicate that you have some high currents running through the BEC. Tight ball links, binding servo/linkage somewhere could be the culprit.

BTW -- if you're running the stock motor, stock ESC and "normal" servos, the built-in regulator out of the stock ESC is more than suitable for powering the on-board stuff. There really is no need for an external BEC.

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

Dave
11-01-2009 01:28 AM
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himaxkeith
Senior Heliman
Location: Atlantic City NJ. USA

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What ESC are you using? The 60 amp Align ESC has the built in BEC You can set to 5,5 1/2 or 6 volts depends how you program it. Cannot use a seperate BEC with that ESC that I know of. It all ready supplies the reciever power thru the throttle channel. The larger 75 amp Align ESC you need a seperate BEC or just a reciever battery. It should not get scalding hot either way. Unless the ESC is no good or the motor is shorted or something is hooked up wrong
11-01-2009 01:30 AM
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Evan D
Senior Heliman
Location: Charlotte, NC

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The Align ESCs are variable from 5 to 6 volts, not just the three voltages you list. Almost all ESCs that have built in BECs can have the BEC disabled so you can run a seperate one. You disconnect the red wire from the radion connector. The best thing to do is un clip it from the connector and pull it back an heat shrink it to the ESC wire out of the way. That way you can reinsert it if yo uwant to use the BEC again.

There really is no reason not to use the ESC BEC though.
11-01-2009 01:38 AM
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dkshema
rrMaster
Location: Cedar Rapids, IA

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Quote 
Cannot use a seperate BEC with that ESC that I know of.

If you disconnect the +5V wire in the three-wire cable between the ESC and the receiver, you can run ANY external BEC with the ESC. Removing the red wire disconnects the ESC's internal BEC from the rest of the world, allowing the external BEC to supply power to the electronics. Doing so allows the internal regulator of the ESC to supply the necessary voltage for the guts of the ESC, but disconnects its output from the rest of the system. The ESC still supplies uses the throttle signal from the RX, and the presence of the ground wire in the cable simply makes sure the battery ground reference is tied to the ESC, receiver, and external BEC, driving all three points to the same ground potential.

As for Align ESCs being variable from 5 to 6 volts, that's true, but if you don't have a voltmeter handy, you'll follow the setup manual and have the choice of 5, 5.5, or 6 volts out, depending upon the stick being set to low, middle, or high during the voltage programming step.

For those of you who weren't aware, when you've stepped into the voltage programming mode of the Align ESC, the output voltage of the ESC is set by stick position of the throttle. Low selects 5, full throttle selects 6, and mid stick selects 5.5 volts. If you have a voltmeter hooked up so you can read the voltage at the RX, then you can set the throttle stick anywhere you want to get the voltage out that you desire, as long as it's between 5 and 6 volts.

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

Dave
11-01-2009 02:00 AM
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himaxkeith
Senior Heliman
Location: Atlantic City NJ. USA

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Dont know any other voltage I listed Low stick 5 volts half stick 5 1/2 and 6 volts at high stick. But its good to know you can disable that feature. I have a problem with my ESC now.I shipped it out to get it checked. When I throttled up it went to 100 % then throttled down then back up again it would only go to about 75%. Just recieved it back and they found nothing wrong, so they say. Just hooked it up today and it will not power the reciever. The output shows with a meter 5 1/2 volts plug it in to the reciever and it drops to .80 volts un plug it and it reads back up to 5 1/2 again. Not trying to take over your thread but what im getting at it could be bad right out of the box. I only have about twenty flights on mine and its no good.
11-01-2009 02:02 AM
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dkshema
rrMaster
Location: Cedar Rapids, IA

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Himax. The voltage output problem you're having sounds like a bad ESC, but maybe something in your setup is drawing excess current, causing the ESC's BEC to shut down.

The throttle setting MIGHT have been a programming thing. When you program the ESC, you need to make sure your radio is putting out a linear 0 to 100 % throttle curve. I made that mistake once, and the ESC ended up being programmed for anything BUT what I thought I had selected.

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

Dave
11-01-2009 02:10 AM
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himaxkeith
Senior Heliman
Location: Atlantic City NJ. USA

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Dave , I even tried disconnecting the motor wires and a different reciever. They may have sent sombody elses problem back to me. The reciever will power up with a battery pack thru the batt.channel or port. But I cannot get any amps out of the BEC side of this ESC. They did offer to send me a new one for half price I said no because I may need to buy a new motor or a new reciever. But now I know its a bad unit[ESC]
11-01-2009 02:23 AM
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dkshema
rrMaster
Location: Cedar Rapids, IA

My Posts This: Topic  Forum
Yup, I agree, sounds like that ESC is a goner.

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

Dave
11-01-2009 03:12 AM
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Revolution Models . CarbonXtreme . Midland Helicopters

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e-Align T-REX 250-450-500-600 > T-REX 500 BEC scolding hot?
 
 
Ben-T-Spindle
rrProfessor
Location: Central Illinois

My Posts This: Topic  Forum
BEC’s should never get hot. They may get a little warm but never hot.

A hot BEC could indicate that you have a servo or linkage problem. Make sure all servos are good and that there is no binding at the control extremes.




... BTS
11-01-2009 11:10 AM
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e-Align T-REX 250-450-500-600 > T-REX 500 BEC scolding hot?
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