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  • #1

    Ok to Extend esc cables?

    My esc sits in the nose cone on my 700e because no matter how i have the lipos sitting on the battery tray,they wont reach the esc if its mounted at the rear.
    My esc's getting hot up front so whats the solution?.is it ok to extend the esc leads by 3" say?.im using turnigys and zippys which have short ish discharge leads.is there another solution im missing?

    Thanks!
    goblin BT700 havok (red)
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  • #2
    Don't quote me on this,

    But extending The ESC cables have caused failures due to the resistance or something. I think the CC ESCs require a certain length.
    "Anger and Frustration bring the best out of my flying ability.. because generally I don't give a shit either if the machine hit's the deck or stay's in the air - both will accomplish satisfaction, but most of all it exerts the feeling of flying conservatively. - Callum"

     www.callumheli.co.uk

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    • #3
      Which of the ESC leads do you want to extend?

      I have in the past extended the battery side of the ESC and the RX lead of an ESC without any problems...

      I would never extend the length of the motor side - its best these are kept as short as possible.

      If extending the battery cables, use good quality wire that is fit for purpose...
      Matt
      Goblin 500 Sport
      Owner of       One E.G.S.

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      • #4
        From what I've read on this topic, you can extend the motor side without any real issues, but has to be within reason due to timing. Very common on EDF jets to do this as ESC is up front and motor down the back. The battery side is more sensitive as it increases the load on the capacitors of the ESC.
        Nick
        Rave Ballistic FSO Black - Fusion 50 - Goblin 500 - Synergy N5
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        • #5
          Originally posted by Young Gun View Post
          Which of the ESC leads do you want to extend?

          I have in the past extended the battery side of the ESC and the RX lead of an ESC without any problems...

          I would never extend the length of the motor side - its best these are kept as short as possible.

          If extending the battery cables, use good quality wire that is fit for purpose...
          +1

          Keep battery leads as short as possible, but I do know a few people with a fair bit of wiring to the batteries and they seem to run ok (with Jive ESCs).

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          • #6
            It increases the inductance of the cables. Inductance is the opposite of capacitance. Capacitors keep volts constant and inductors keep current constant. In practice this means that the volts across the output transistors will not be so well controlled as the battery is used to control spikes. If you have a 6S esc working on a 3S battery this will not be a problem or if you have a good esc with high voltage transistors. My 6S JPEnerG Esc has only 30V transistors. It also depends on the state of the battery as the spikes from a good battery will be less than an old battery. The answer is either suck it and see or ask someone with a 'scope to look at the noise across the transistors and also check the voltage rating of your transistors. You could also add another capacitor across the existing ones close to the esc.
            Flasher 450 Sport. Assan GA250 with 520 tail servo, MKS DS450 cyclic.
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            • #7
              I need to extend the battery side wires,its a castle ice2 120hv.

              Think this might be whats needed

              Castle Creations CC CAP PACK 011-0002-02
              goblin BT700 havok (red)

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              • #8
                Won't do any harm, except to yuor nerves when you plug in the battery. Should give a bigger spark if it's working. Might be an expensive way to do it. Could be worth checking out the cost of the capacitors and some heat sink. Sometimes one off components are very expensive.
                Flasher 450 Sport. Assan GA250 with 520 tail servo, MKS DS450 cyclic.
                Multiplex Cockpit Tx, DX7, DX6i
                Blade 130-X, MSR, MSRX
                Phoenix Sim

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                • #9
                  How is extending the battery side cables on the esc any different to having different length cables on your lipos? As long as the connection is good and you use the same size cable, I would think you will be fine. (assuming you're not talking about adding feet of extension cable but a few inches isnt going to hurt)

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                  • #10
                    Originally posted by Reality Bites View Post
                    How is extending the battery side cables on the esc any different to having different length cables on your lipos? As long as the connection is good and you use the same size cable, I would think you will be fine. (assuming you're not talking about adding feet of extension cable but a few inches isnt going to hurt)
                    This was my thinking as well. If you have more resistance won't you have heat as well? Same with a poor connection, you'll be able to tell because the wires will get hot.

                    My Lipos have varying lengths of wire, most are about 5 or 6 inches but on my 500 because of having LiPos with different connectors I have a few different adaptor cables made up that add a couple inches, so the total length to the ESC probably varies by 3, maybe 4 inches depending on the LiPo I use.

                    That cap pack is interesting though.
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                    • #11
                      If you are using appropriate guage wire, the few extra inches will add meaningless resistance.

                      As CJ has said, it's inductance you need to worry about. If you have a CC ESC you can see the effect of this as the ripple reading...

                      Over a period of time it can lead to the failure of the ESC, the caps in particular. Adding the cap packs helps smooth the ripple and is a good idea if you have long wire runs (though best avoided in the first instance, sometimes it's necessary). YGE also make some "cap pack" style things you might want to have a look at.
                      Ridding the world of Helis, one crash at a time....

                      sigpic Proud owner of an EGS and a platinum EGS!!!

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                      • #12
                        If you have 30V output transistors and noise spikes of 29V you will be ok. Noise spikes of 30.1V and your esc will catch fire. So a very small change can make a big difference. If the esc designs were'nt so marginal there would not be a problem. The point is you don't know. Adding the caps should be a good idea as it will reduce the noise spikes, unless there is another factor. Noise spikes with bipolar power transistors do not suddenly kill devices but reduce their life to a few tens of hours. I once inherited that problem and the original designer and I cured the problem by changing a resistor value. I'm not sure if Field Effect Transistors behave the same way or if they just go pop. What you should be doing is getting the design of some of these escs investigated so that your hard earned money stops burning up.
                        Flasher 450 Sport. Assan GA250 with 520 tail servo, MKS DS450 cyclic.
                        Multiplex Cockpit Tx, DX7, DX6i
                        Blade 130-X, MSR, MSRX
                        Phoenix Sim

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                        • #13
                          The battery side shouldnt matter at all, because you are not asking the battery to provide a pulsed output.

                          Current from the battery to the ESC should be pretty smooth, so inductance doesnt really come in to play.

                          The connection from the ESC to motors however does, and this should be as short as possible.
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                          • #14
                            Jimmy, it really does... Read some of the major ESC manuals (eg YGE i know for sure, i'm sure I remember seeing it from kontronik, and castle even blamed it as one of the reasons for all the fires) and they warn against extending the battery cable side.

                            If you are going to extend on the battery side, cap packs are a good idea.
                            Ridding the world of Helis, one crash at a time....

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                            • #15
                              Now when you add inductance to cables by making them longer you can negate the effects of this by providing a local energy source so that this added inductance dosent cause ringing when the devices turn off.

                              Thats why... now how.

                              There is a cpapcitor directly across the end of these cables. its normally 2 - 4 electrolytics low impedance types. you can improve its HF performance by adding polyester capacitors across it with the shortest leads possible for the low frequency drives used for motors you wull need larger values say 2-5 uf they are uasally 5-10 times better at providing the transient energy than electrolytics very common in UPS where you cant get the large eletrolytic directly on top of the device...

                              Its like adding a local battery directly on top of the fets...


                              Steve
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