ESC output 6.78v ?

Astronobaldo · 03-07-2009, 08:17 PM

I got a Trex250 from a member here in this forum a couple of week ago. I did not get one good flight on it yet. I'm getting several issues (motor suddenly stops, esc hot like hell, tail servo stops working of of the blue, servos starts moving like crazy)

A friend of mine tested the tail servo using a servo tester and noticed it wasn't working properly. So he said this servo could be causing the ESC got really hot then the issues with the motor and the other servos.

Fair enough. I then got a brand new tail servo. Put the heli to fly ... after 2 minutes flying. Same issues start happening again!

Tested the tail servo and another tail servo fried

I checked the ESC voltage and it is showing 6.78v. Could that explain the issues I'm getting? (I believe so, but I just want to double check before buying a new ESC + Tail servo)

Thanks,
Abner

Holst · 03-07-2009, 08:32 PM

Thats definately too high, its a shame you burned another servo before you found the problem

Astronobaldo · 03-07-2009, 08:50 PM

Quote:

Originally Posted by Holst

Thats definately too high, its a shame you burned another servo before you found the problem

yep, that is a shame indeed. 2 tail servos + ESC ... I wish I had bought a brand new kit instead! I bought few second hand helis before ... but I'm afraid this one is my last one. Lesson learned.

rceccleston · 04-07-2009, 08:44 AM

Recommend disconnecting positive on esc and installing an external BEC.

daren · 04-07-2009, 09:59 AM

You can adjust the output voltage of the align speed controller, using it's setup, don't have the instructions to hand but i'm sure someone will have them.

Astronobaldo · 04-07-2009, 12:11 PM

Quote:

Originally Posted by daren

You can adjust the output voltage of the align speed controller, using it's setup, don't have the instructions to hand but i'm sure someone will have them.

I've done that. Changed to 5v.Output was showing 5v (so far so good) but then I put the servos and after a while the servos start moving up and down like crazy. Then I stopped tried before I burn the other servos

Astronobaldo · 04-07-2009, 12:12 PM

Quote:

Originally Posted by rceccleston

Recommend disconnecting positive on esc and installing an external BEC.

That might be an option. Do you know which BEC would fit into Trex250?

cheers.

rceccleston · 04-07-2009, 04:37 PM

Quote:

Originally Posted by Astronobaldo

That might be an option. Do you know which BEC would fit into Trex250?

cheers.

A Hobbywing UBEC from ebay would do.

andylinney · 04-07-2009, 05:27 PM

A dropdown would sort this. No real extra weight to worry about in comparison to a Ubec.

rceccleston · 04-07-2009, 09:32 PM

Quote:

Originally Posted by andylinney

A dropdown would sort this. No real extra weight to worry about in comparison to a Ubec.

For the cost and weight of a UBEC, is it really worth risking your heli when it fails?

03-07-2009, 08:17 PM	#1 (permalink)
Astronobaldo Registered Member Join Date: Mar 2009 Location: UK Posts: 174 Thanks: 90 Thanked 10 Times in 9 Posts	ESC output 6.78v ? I got a Trex250 from a member here in this forum a couple of week ago. I did not get one good flight on it yet. I'm getting several issues (motor suddenly stops, esc hot like hell, tail servo stops working of of the blue, servos starts moving like crazy) A friend of mine tested the tail servo using a servo tester and noticed it wasn't working properly. So he said this servo could be causing the ESC got really hot then the issues with the motor and the other servos. Fair enough. I then got a brand new tail servo. Put the heli to fly ... after 2 minutes flying. Same issues start happening again! Tested the tail servo and another tail servo fried I checked the ESC voltage and it is showing 6.78v. Could that explain the issues I'm getting? (I believe so, but I just want to double check before buying a new ESC + Tail servo) Thanks, Abner __________________ T-rex 700 N T-Rex 600N Pro T-rex 600 NSP T-Rex 450 Pro (Cool!) Blade mCX DX7

03-07-2009, 08:32 PM	#2 (permalink)
Holst Registered Member Join Date: Feb 2009 Location: Leics - UK Posts: 1,422 Thanks: 46 Thanked 316 Times in 279 Posts	Thats definately too high, its a shame you burned another servo before you found the problem __________________

04-07-2009, 08:44 AM	#4 (permalink)
rceccleston Registered Member Join Date: Aug 2008 Location: Shropshire Posts: 523 Thanks: 36 Thanked 89 Times in 76 Posts	Recommend disconnecting positive on esc and installing an external BEC. __________________ T-Rex 500 ESP 6s, Skookum 720, CC80&BEC, Scorpion 3026-1600KV, Futaba 9650x3, DS8900G. T-Rex 600 ESP 12s, Skookum 720, CC 85HV&BEC Pro, Scorpion 4025-630KV, DS610x3, DS8900G. T-Rex 700e 'Chrome Edition', Skookum 720, CC 110HV, Scorpion 4035-400KV, DS610x3, DS650. Sponsored by

04-07-2009, 09:59 AM	#5 (permalink)
daren Registered Member Join Date: Feb 2007 Location: winchester Posts: 556 Thanks: 119 Thanked 196 Times in 153 Posts	You can adjust the output voltage of the align speed controller, using it's setup, don't have the instructions to hand but i'm sure someone will have them. __________________ Cheers Daren Sponsored by Quick UK

04-07-2009, 05:27 PM	#9 (permalink)
andylinney Site Sponsor Join Date: Sep 2006 Location: Irvine Posts: 2,003 Thanks: 440 Thanked 590 Times in 404 Posts	A dropdown would sort this. No real extra weight to worry about in comparison to a Ubec. __________________ Coming 8th in Grassroots? Who'd have thought... Outrage Velocity .50 / Mikado Logo 400 / T Rex 450 Pro Member of Waterfoot Helicopters X2

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