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EDF Problems in SR71 Build.
- THE BLACKBIRD
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15 Feb 2012 19:56 - 09 Mar 2012 04:25 #1
by THE BLACKBIRD
EDF Problems in SR71 Build. was created by THE BLACKBIRD
Mod Edit... Please see here for the SR71 build thread.
www.modelchat.org.uk/forum/building-thre...-build-the-blackbird
Today i managed to smoke a £70 esc ment for the sr71,
Have i wired it in correctly, i think i have, but i am new to the leccy
The first time i fired it up there was no problem, i got to about 1 thired trottle and the fan came off hit the window and went around the room, no damage to anything including the fan, so i refixed the fan makeing a grove for the grub screws the seat in.
I reconnected the the lipo's and the smoke appeared from the esc with a little twich from the fan.
I dare not run the other one untill im sure i am right.
www.modelchat.org.uk/forum/building-thre...-build-the-blackbird
Today i managed to smoke a £70 esc ment for the sr71,
Have i wired it in correctly, i think i have, but i am new to the leccy
The first time i fired it up there was no problem, i got to about 1 thired trottle and the fan came off hit the window and went around the room, no damage to anything including the fan, so i refixed the fan makeing a grove for the grub screws the seat in.
I reconnected the the lipo's and the smoke appeared from the esc with a little twich from the fan.
I dare not run the other one untill im sure i am right.
Last edit: 09 Mar 2012 04:25 by Phil Wood.
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- Eric
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15 Feb 2012 20:09 - 15 Feb 2012 20:11 #2
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic EDF Problems in SR71 Build.
Quick reply - does the fan spin when you turn it by hand? The thing that comes to mind, if it worked before, is that the motor has jammed, somehow.
Eiother the unloaded motor has over-revved and thrown a winding, or the fan blades are not quite central to the duct, and are binding.
Eiother the unloaded motor has over-revved and thrown a winding, or the fan blades are not quite central to the duct, and are binding.
if you are calm and collected when all about you are going berserk - you've missed something important!
Last edit: 15 Feb 2012 20:11 by Eric. Reason: added a bit
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- THE BLACKBIRD
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15 Feb 2012 21:29 #3
by THE BLACKBIRD
Replied by THE BLACKBIRD on topic EDF Problems in SR71 Build.
everything spins ok no binding at all
I should have said that i am running it on 10 s at the moment one 6s and one 4s
i will use 12s when in the plane
the other thing is that the negative connection sparked when i connected the lipo's to the esc blackening the connector.
I should have said that i am running it on 10 s at the moment one 6s and one 4s
i will use 12s when in the plane
the other thing is that the negative connection sparked when i connected the lipo's to the esc blackening the connector.
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- Garry Pollard
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15 Feb 2012 21:57 - 15 Feb 2012 21:59 #4
by Garry Pollard
Replied by Garry Pollard on topic EDF Problems in SR71 Build.
If anything blackens a connector , this points to a short. I often get a spark when connecting the lipo, but it never blackens anything. Check and recheck all wiring as something must be wrong.
Just a thought, have you checked the first motor with a meter to make sure that nothing went wrong with it, when the fan came off.
Also, looking at the last pic again, double check the "deans" conector. It doesnt look right.
Garry
Just a thought, have you checked the first motor with a meter to make sure that nothing went wrong with it, when the fan came off.
Also, looking at the last pic again, double check the "deans" conector. It doesnt look right.
Garry
Last edit: 15 Feb 2012 21:59 by Garry Pollard.
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- Klipkopwildlife
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15 Feb 2012 22:58 #5
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic EDF Problems in SR71 Build.
You're dead right Garry, the positive of the ESC should go to the positive of the first battery, the negative of the first battery should go to the positive of the second battery, the negative of the second battery should go to the negative of the ESC. So you've got the batteries in series.
Do it now, you may never get another chance
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- Eric
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15 Feb 2012 23:49 #6
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic EDF Problems in SR71 Build.
As an aside - if those are Deans plugs, I'm glad I don't use them! They look to be absolute rubbish!
if you are calm and collected when all about you are going berserk - you've missed something important!
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- Klipkopwildlife
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16 Feb 2012 00:05 #7
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic EDF Problems in SR71 Build.
Actualy Eric, I use Deans plugs and I think they're the biz, BUT, you must use Mil spec solder (hi silver content I understand) and you must use an Iron that goes to at least 4400C
Do it now, you may never get another chance
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- THE BLACKBIRD
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16 Feb 2012 00:07 #8
by THE BLACKBIRD
Replied by THE BLACKBIRD on topic EDF Problems in SR71 Build.
if you look they are wired in series, the connectors are only held together with balsa for the picks
i went back and tried again after reading your posts checked the wireing connected the 4s and a red light started flashing on the esc connected the 6sto the 4s and the esc went up in flames.
i went back and tried again after reading your posts checked the wireing connected the 4s and a red light started flashing on the esc connected the 6sto the 4s and the esc went up in flames.
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- Quorneng
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16 Feb 2012 01:59 #9
by Quorneng
Replied by Quorneng on topic EDF Problems in SR71 Build.
Do I take it from your last post that the second ESC has gone as well? Without running the fan at all?
If so it begs the question are the ESCs actually rated for 10s LiPo simply for voltage, nothing to do with the current.
If so it begs the question are the ESCs actually rated for 10s LiPo simply for voltage, nothing to do with the current.
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- Eric
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16 Feb 2012 04:21 #10
by Eric
if you are calm and collected when all about you are going berserk - you've missed something important!
Replied by Eric on topic EDF Problems in SR71 Build.
if you are calm and collected when all about you are going berserk - you've missed something important!
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- Klipkopwildlife
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16 Feb 2012 12:50 #11
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic EDF Problems in SR71 Build.
Sorry BB, if they were wired correctly in series the red light would only have started flashing after you connected the second lipo. When wired as I described you will only have voltage on the ESC when you connect the second one.
Do it now, you may never get another chance
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- Klipkopwildlife
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16 Feb 2012 12:54 #12
by Klipkopwildlife
Do it now, you may never get another chance
Replied by Klipkopwildlife on topic EDF Problems in SR71 Build.
Sorry, rereading your post, I take it you connected the 4S first, and the 4S energised the ESC with it's 14.8volts. Then you disconnected and put the 6s in the circuit as well, which would give 37volts, which then forced the ESC to fry itself. Sounds to me as though the ESCs' are not rated for 10S.
Do it now, you may never get another chance
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- The Beard
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16 Feb 2012 14:37 #13
by The Beard
Replied by The Beard on topic EDF Problems in SR71 Build.
Can you tell us the motors your using BB,and am I right your powering them with 2 6s in series which means 12s so is that48 volts fully charged( I know your on 10s at the mo,).If so,I think the esc is way to small.Working out that I was supplies an 80 amp esc with a 5s it has to be at least 200 amp esc.
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- THE BLACKBIRD
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16 Feb 2012 15:17 #14
by THE BLACKBIRD
Replied by THE BLACKBIRD on topic EDF Problems in SR71 Build.
Ok it looks like i have boobed with my selection of esc.
Looking for another two esc's with a 150 amp rating, although the biggest Scorpion do ( im useing Scorpion motors ) is rated at 130 amps £160 each plus postage ( gulp )
Any idea's please
Looking for another two esc's with a 150 amp rating, although the biggest Scorpion do ( im useing Scorpion motors ) is rated at 130 amps £160 each plus postage ( gulp )
Any idea's please
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16 Feb 2012 16:52 #15
by The Beard
Replied by The Beard on topic EDF Problems in SR71 Build.
Do you know the motor spec BB
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