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Ark › Smoking wires....?
02-08-2006 11:27 PM  12 years agoPost 1
Verticalvortex

rrNovice

Hamilton, Ontario CANADA

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Hi out there...
Newbie with mx400, (Blade CP..time in last couple months)and this is what is happening.
2100ma Lipo to JST male connector (20AWG)
Female JST connector on 20AWG, (about 3 inches wire), then soldered
to ESC wire with shrink wrap over junction.
Twice, within about 4 to 5 minutes of nervous hovering, the machine shuts down completely, smoke from under the machine, identified as molten insulation and a short, just behind the female connector.
The insulation was melted together, and consequently the short.
Aluminum wire. No damage to electronics etc. Connector replaced.
With same wire guage between battery and JST connector, I'm wondering why the female is taking the hit (no gender joke intended)
The Esc is rate for 35 Amps.
NOw the obvious solution is to go to better connectors, and maybe better gauge wire, but probably a fuse should be introduced, I think?
Anyone else have the same or similar experience..
Definitely appreciate feedback.
OTOH, MAN..what a difference from the Blade, can't get over the dynamics of the head speed and cyclic sensitivity....geeze, back to bottom of learning curve again....but I like it..!!!!!
Cheers
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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02-08-2006 11:58 PM  12 years agoPost 2
z11355

rrMaster

New England

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no fuse.

the JST and associated thin wire are totally inadequate for
the MX400+ size machines.

get some Deans Ultras and solder em up.

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02-09-2006 05:21 AM  12 years agoPost 3
Squirrlybird

rrVeteran

Suffolk, Va US

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I use the sermos connectors, but most use deans. JST wont work as you have found.

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02-10-2006 01:52 PM  12 years agoPost 4
WeatherB

rrVeteran

Toronto - Canada

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Yup, JST isn't good enough and the resistence is heating up your wires.

Get the Deans Ultra.

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02-10-2006 08:06 PM  12 years agoPost 5
Verticalvortex

rrNovice

Hamilton, Ontario CANADA

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Thanx gents...sorry to post about the obvious, but this is the best
site to find all the nitty-gritty details, and being so new to these beasts, I'm trying to get my head on with loctite....
Thanx for the info, already did as suggested.
Cheers
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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02-11-2006 10:30 PM  12 years agoPost 6
tikaboo

rrApprentice

Fylde Coast, UK

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How did you get that fat cabling into an itty bitty jst??

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02-12-2006 03:49 AM  12 years agoPost 7
Verticalvortex

rrNovice

Hamilton, Ontario CANADA

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There's a blonde joke here.....
Went to the LHS and the 'guru' said, "yes...we have that exact connector and wire" Took it home, put it on and the exact same thing happened...
toast!!!
Having ducked lightning strikes most of my life, I changed the wires and connector to an appropriate size, and voila, no more scorched wire and insulation smell.....yippee

except now I have to figure out why the motor smoked and shut down, dead.
...tho at this stage I am not sure if the motor is toast, or the ESC??

Will put the ESC on a scope and see if there is any life, and check the motor for continuity. I think that s all I can do, as I have no other motors or ESC to compare or swap out.

She will rise again
Cheers
Ray

Sore neck, looking up at the learning curve, wishing it was my heli..

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