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Old Nov 23, 2013, 01:44 PM
Aka: Tom Jenkins
ApexAero's Avatar
United States, FL, West Palm Beach
Joined Aug 2008
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Another ESC Lesson learned!

As most of you guys know My build has been plagued by Murphy from day one.
I learned and surmise the the negative lead should be the one pulled first when disconnecting the battery from the power system. As it were, great flight, getting used to the characteristics of the airframe, best landing to date, gather the jet. walk back to the pits, then short the hot lead to something else on the ESC and POP, no workie no mo..... frikin bummed out my friends
capacitors are rubicon 35v470uf
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Last edited by ApexAero; Jan 08, 2014 at 03:06 PM.
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Old Nov 23, 2013, 01:49 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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at least you have passed on your experiece to us so we dont make the same mistake. not sure if i always unplug the neg side first ,so good to know.
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Old Nov 23, 2013, 06:02 PM
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United States, KY, Louisville
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I just started using bullets. Always used Deans. Now I'm super paranoid of this exact thing. I made little Shrink Wrap Boots to go over the battery leads so that when I unplug a lead, I don't have to worry about it touching something.
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Old Nov 23, 2013, 06:45 PM
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nerv's Avatar
United States, CA, San Jose
Joined Jan 2007
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I use the HK xt150 connector with color cover.
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Old Nov 23, 2013, 10:33 PM
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United States, MO, Warrensburg
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EC5s! Bullets but without risk of polarity mistakes. I have them on just about everything.
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Old Nov 23, 2013, 11:24 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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i solder bullets to deans connectors as safty covers ....plus then i can use them on other planes that i dont have bullets on .
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Old Nov 24, 2013, 01:15 AM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Just saw this thread/post Tom. Actually it doesn`t matter which lead you unplug first. Sounds more like the esc needed more insulation to me. There are open pos and neg points on all escs. If your pos lead touches something neg, or vice versa, you`ll have fireworks and a dead esc.

Most of the time the esc is a safe distance away from the power lead ends and there isn`t any way for the lead to contact the esc. On your all out speed demon, with the esc attached to the battery hatch, everything is in close proximity, so extra precaution has to be taken.

On an esc it`s a fine line between bringing in airflow and keeping out unwanted power contact.

But, as long as one lead of the lipo is attached to the esc, the loose lead is "hot" regardless of whether it`s pos or neg.
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Old Nov 24, 2013, 01:24 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
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are heat sinks on ESC grounded?
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Old Nov 24, 2013, 01:38 AM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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no, they shouldn`t be. Every one I`ve had is only touching the outer body of the fets and is insulated from them by the adhesive
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Old Nov 24, 2013, 02:11 AM
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farmington hills mi.
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Anderson Powerpoles

The pic is of four batteries in series parallel supplying 12s 150 amps for twin 90s' in my Citation. They are unisex and well insulated even when unplugged. I need no adapters to use them in most any configuration. The black/white jumper is an anti spark resistor that will be removed. Now with YEP HV escs' the anti spark is built in and not needed.
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Old Nov 24, 2013, 06:04 AM
Aka: Tom Jenkins
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United States, FL, West Palm Beach
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Thank you for the sympathy all! I figured by loosening the negative first there would be no possible way for any power to short on any thing of the esc when using polarized bullets. Lee hit it on the head, I run the esc exposed w/ no heat shrink and space is limited. But had I of done it correctly instead, the esc may have been still ready for today....
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Old Nov 24, 2013, 07:53 AM
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Denver CO
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Bummer apex,
Ive always been afraid of bullets myself for this exact reason. Heck..
I've been one that has soldiered my neg/pos backwards on dean connectors and plugged them in .

So dont be to hard on yourself. New build or new equipment?
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Old Nov 27, 2013, 05:54 PM
Registered User
Ontario, Canada
Joined Jul 2005
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Quote:
Originally Posted by Jetnfast View Post
EC5s! Bullets but without risk of polarity mistakes. I have them on just about everything.
+1

On low power setups (under 75 amps) I have usually used Deans, but I have tried the EC5 connectors on higher amp planes and I like them too!
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Old Nov 27, 2013, 07:51 PM
EDF Jet Jam 2015, May 28-31st
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
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Quote:
Originally Posted by SkylineFlyer View Post
I just started using bullets. Always used Deans. Now I'm super paranoid of this exact thing. I made little Shrink Wrap Boots to go over the battery leads so that when I unplug a lead, I don't have to worry about it touching something.
This what I use: http://www.mcmaster.com/#92805k14/=pkg3t9
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Old Nov 27, 2013, 08:49 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Those are a great find Bob, thanks for the link. Lots of sizes too.
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