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Old 09-22-2007, 09:23 PM   #1
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Default Hissing jet of flame from my XBR

One moment ago I just had my Novak XBR speed control on sitting in my work area at home. I had run my car a few hours earlier with the BRAND NEW XBR in it without a single problem. I hook up a 12V DC fan (i know it's 12V, but that should not have anything to do with what is about to happen) to the ESC's 2 fan pins with the correct polarity. with the fan blowing softly for about 20 seconds, a hissing jet of blue and white flame about 1/2 an inch long comes from the side of my XBR! i tried blowing the flame out, but nothing happened. i immediately unplugged my dean's connectors and the fire went out.

the fire was jetting onto the inside of my 05R plastic tub chassis, but nothing melted. the jet of flame looks as if it came from where the positive/negative battery wires join the circuit board. and since i am running a stock brushed motor, i had to solder on an extra wire from the positive battery terminal to the positive end of my motor. the extra motor wire was not even near touching the negative terminal. however, upon inspection, the burn marks look like they go right down the middle of the two terminals and into the case. what could have caused this? i am using IB 4200s with a CO27 stock motor, airtronics MX3S radio, and a futaba 9550 servo. could it have been the fan? i dont think so.

however, i looked at the liquid flux, "Stay Clean" flux to be precise, and the labeling said "not recommended for electrics or electronics". i have been using this for a while now on all of my electronics without a problem. however, could it be that it is flammable, and that the terminals heated up so that the residual flux from after soldering ignited? but the ESC was not even on throttle. i am dumbfounded and extremely suprised that this would happen with a Novak product.
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Last edited by macnkitty2002; 09-23-2007 at 08:23 AM.
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Old 09-22-2007, 09:29 PM   #2
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oh ya, and the flame completly DE-SOLDERED the extra motor wire that was previously soldered to the positive battery terminal. that's one hot flame!!
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Old 09-23-2007, 12:01 AM   #3
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Quote:
Originally Posted by macnkitty2002 View Post
I hook up a 12V DC (i know it's 12V, but that should not have anything to do with what is about to happen) to the ESC's 2 fan pins with the correct polarity.
why would you do that?
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Old 09-23-2007, 12:06 AM   #4
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Here's your sign....
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Old 09-23-2007, 01:03 AM   #5
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Quote:
Originally Posted by macnkitty2002 View Post
I hook up a 12V DC (i know it's 12V, but that should not have anything to do with what is about to happen) .
http://www.teamnovak.com/products/esc/xbr/index.html says "Input Voltage 4-7 Ni-Cd/Ni-MH cells (1.2V/cell) or 2 Li-Poly cells
4.8 - 8.4V

I suggest to read instruction manual before hooking 12v to ESC...
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Old 09-23-2007, 01:54 AM   #6
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What's that saying...You can't fix stupid
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Old 09-23-2007, 02:38 AM   #7
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Probably the fans were on the same power source as the ESC, so 12VDC went into the ESC and fried it.

I would not be surprised... this is a hobby, not everything here is made to be completely idiot proof.
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Old 09-23-2007, 07:08 AM   #8
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There being a bit rough on ya macnkitty
But a 12v power supply to a speedy ?? how many amps
i dont like your chances of warranty...
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Old 09-23-2007, 07:12 AM   #9
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when you add 12v to a little speedo things get hot, hot, hot

Good luck with the warranty.
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Old 09-23-2007, 07:14 AM   #10
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Consult an adult before doing that next time.
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Old 09-23-2007, 08:23 AM   #11
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Quote:
I hook up a 12V DC (i know it's 12V, but that should not have anything to do with what is about to happen) to the ESC's 2 fan pins with the correct polarity.
Quote:
when you add 12v to a little speedo things get hot, hot, hot
NO NO NO!!! what i meant to say was that i hooked up a 12V DC FAN into the ESC fan pins!!!!! When i was writing this up last night, i was still shooken up so i forgot to type in "12V DC fan". WOW, that changes everything huh? i got the fan from radio shack, it's a small laptop CPU fan or something. i figured since the ESC could only put out a maximum of 6V, it could only spin the fan but so fast. I DIDN'T HOOK A 12V DC BATTERY TO MY ESC! REPEAT, I ONLY HOOKED UP A 12V DC FAN TO THE ESC VIA THE FAN PINS!

SORRY FOR THE CONFUSION!
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Old 09-23-2007, 08:38 AM   #12
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sounds like the magic smoke escaped, got nowt to do with the fan I would think. Just an internal failiure. If it is new, return it to manufacturer/shop for replacement/repair.
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Old 09-23-2007, 09:03 AM   #13
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did you hook the fan up backwards? That might still void the worranty, why did you just use a novak fan?
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Old 09-23-2007, 09:31 AM   #14
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Quote:
did you hook the fan up backwards? That might still void the worranty, why did you just use a novak fan?
no it was hooked up the correct way. and i didn't use a novak fan because i could not get one at my LHS, and i didn't see any problem with using a 12V fan. is it that the ESC was trying to supply the fan with the 12V and it overheated?
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Old 09-23-2007, 09:34 AM   #15
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The Carbon-reinforced plastic parts on the 05R actually have a tiny bit of conductivity. I doubt it's enough to cause a short but who knows? Was your esc solder tabs touching the rear bulkhead stiffener?
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