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Burned things up

PostPosted: Sat Jan 19, 2013 6:22 pm
by chixter57
Hello to all, first time post on this informative board. I'm just getting back into the hobby after a 2 decade hiatus. Not wanting to bother with nitro engines and fuel and such, I was amazed at the progression of electronic airplane flight. So my adventure begins. I'm putting together an AXN per Bruces build videos. In the vids he advises to test the servos prior to installing them. And here is where I think I messed up. I COULD have used my already built Dynam Mustang, fired it up and plug the new servos in one at a time into say the 'elevator' terminal of the rx to ensure that they work. But in my clouded judgement I did the following instead:

I removed the Rx from the mustang and put it on my bench. I plugged the small plug from a new HK 25/30 3BEC ESC into the 'Throttle' terminal of the Rx. I connected 1 new HK 9g servo into the 'elevator' terminal of the Rx. All wiring/polarity etc was double checked....keep in ming the ESC was NOT wired to anything...just sitting on the bench. I plugged my Zippy 2200 20c Lipo into the ESC plug and......Instant SMOKE.

I def fried the ESC and as the Rx now does not function in the Mustang I believe I damaged it as well. Both the Rx and the ESC have that nice 'toasted electronics' smell to them.

1. What did I do wrong?
2. I have since ordered a servo testing gizmo. Did my setup not having the ESC wired to a motor cause my problem?

chixter

Re: Burned things up

PostPosted: Sat Jan 19, 2013 8:22 pm
by quarry44
It sounds like a wiring problem.I believe the rx got the full voltage blast from the lipo,which would kill it stone dead.Motor not connected to esc makes no difference.Maybe the bec in the esc was disabled by default.Or there was a short in your wiring.

Re: Burned things up

PostPosted: Sun Jan 20, 2013 3:39 am
by chixter57
Close inspection of the ESC revealed very sloppy soldering of the chips on the bottom of the board. Many leads fused together with splashed solder. Everywhere my test leads touch on the board I read 000 Ohms. Could be the whole thing was shorted out before I ever plugged it in! I have a good photo but dont know how to post it here. I think I just got a POS ESC. Was a HK 25/30 3 BEC

Re: Burned things up

PostPosted: Tue Jan 22, 2013 12:16 am
by chixter57
Ok to close this out. My 1st and LAST experience with HK electronics. All over on various boards I read that "they are inexpensive" as the only good character. This ESC was only $12 US but I'd rather pay 18-20 or even a bit more for one that will work as expected with reasonable qc than go the inexpensive route and just throw it in the trash because it's crap.

Re: Burned things up

PostPosted: Tue Jan 22, 2013 11:30 am
by cynr100
I am now using Turnigy Plush ESC's (not all from HK by the way) from 18 to 40amp and have not had a proplem with any of them. Considering the amount of damage I do to my planes they have done very well.
I went the cheap way with 2 SS black units from HK, both were 25amp and did not survive more than 1 flight in my AXN using a 5x5.
I have a Skyartec 25amp that took a vertical entry to mother earth, after cleaning the mud off found the heat shrink had fractured and the heat sink had run away. Cleaned and dried the unit, added a new heat sink and shrink. It pulls 20amps on my AXN running a 6x4 without any issues.

Re: Burned things up

PostPosted: Tue Jan 22, 2013 12:11 pm
by Keith
I use the "plush" ones when I can. Mostly 25A, never had a problem either on planes or multicopters...