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HelicopterMain Discussion › 3rd wire on a JR battery?
06-07-2009 03:03 AM  8 years agoPost 1
Jerc 77

rrApprentice

Minot

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I have searched and can't find the answer.
Can someone please tell me what the third (yellow/orange) wire is coming off my JR ni-cd battery is? If I am wiring it to a deans connector should I incorporate it with the pos or the neg?
Any help is appreciated. Also please tell me if I put this in the wrong section.
Thank you.
Jeremy

"Everybody talks about the weather, but nobody does anything about it." - Mark Twain

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06-07-2009 03:08 AM  8 years agoPost 2
RobG

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Duncan BC. Canada

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It does nothing. they just use the same pigtails for everything .ie, servos, gyros.

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06-07-2009 03:22 AM  8 years agoPost 3
dkshema

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Cedar Rapids, IA

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Third wire out of a battery pack hasn't been used for close to 30, maybe 35 years.

There was a time where servo amplifiers used + and - 2.4 volts to run the motor. The "third wire" was essentially the center tap of a series wired 4-cell pack and the motor had either +2.4 volts applied to it to make it run one direction, and -2.4 volts applied to it to make it run the other direction.

Then integrated circuit servo amps came along and integrated into them were "H-bridge" drivers to control transistors used to run the motor. The H-bridge allowed the full 4.8 volts to be applied to the motor and could be driven to run the motor either way.

The third wire has remained in many battery packs and the "deluxe" switch harnesses for all these years, but has been left un-connected in the pack.

It connects to nothing, and doesn't need to be carried through connectors.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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06-07-2009 03:47 AM  8 years agoPost 4
Jerc 77

rrApprentice

Minot

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Thanks
It was the connection between the charge leads and the deans connector. It wasn't even the battery.

"Everybody talks about the weather, but nobody does anything about it." - Mark Twain

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