Capacitor For MM 4S

[pipeous]

just solder it across the power leads from esc that go to the battery. pos to pos, neg to neg. mount it in the buggy where it won't get hit ... just finished my soldering yesterday to fix mine for the same problem hehe

[Maciolus]

Do I have to change cut-off setting while running with Novak HV cap on A123 4S2P?

[Cain]

I don't know why the cutoff setting would be affected by the cap? I would think it should be the same as what you would normally run.

Anyone got more info no this?

[Maciolus]

To be honest I do know almost nothing about electronics. One of my friends told me that cap can slightly elevate voltage. Is it truth?

[BrianG]

Caps can help maintain a more stable voltage, but they have to be sized correctly. A cap able to help with 100A bursts would have to be VERY VERY large, like in the multi-farad range (as opposed to microfarads). Even Novaks larger 2700uF cap is only a 0.0027 farad capacitor. The ESC input caps help to filter out the AC ripple current, not necessarily to smooth out current peaks.

[GriffinRU]

Capacitors on the pcb (close to FET's) are meant for copper traces overload. (Need to be EE or better guru to get it)

Capacitors on the power leads are for poor connectors.

And none of them are meant to provide currents to power the motor, they are here for ESC.

Capacitor size is also a problem, due to the inductance. The smaller the cap (current loop) the better, but you still need to select it for the job. In that respect shorter wider caps are better, but check datasheet as well, not the price tag.
(Avoid long leads on the caps.)

[lutach]

Originally Posted by GriffinRU

Capacitors on the pcb (close to FET's) are meant for copper traces overload. (Need to be EE or better guru to get it)

Capacitors on the power leads are for poor connectors.

And none of them are meant to provide currents to power the motor, they are here for ESC.

Capacitor size is also a problem, due to the inductance. The smaller the cap (current loop) the better, but you still need to select it for the job. In that respect shorter wider caps are better, but check datasheet as well, not the price tag.
(Avoid long leads on the caps.)

Artur,

As you might know, my Schulze 18.97 failed on me. From what Mr. Schulze has said, it was because my wires were too long. I never had a problem such as this before. I know they sell capacitors that goes on the power wires, would that make a difference or would the ESC still have failed?

[GriffinRU]

Originally Posted by lutach

Artur,

As you might know, my Schulze 18.97 failed on me. From what Mr. Schulze has said, it was because my wires were too long. I never had a problem such as this before. I know they sell capacitors that goes on the power wires, would that make a difference or would the ESC still have failed?

Mr. Schulze correct (I can feel that Rene is going to kill me :)), long power leads can cause fatal failure. It is also related to the old FET drivers. And here is the problem if you have built-in protection than you will lose motor sync if you don't you can lose ESC. The best solution is to make that ESC MCU is monitoring such failure, but then you will have cogging as everyone hates. But that is what they trying to say in manuals about proper wire length and quality connections...
At the time when schulze was released such precautions were not a concern and failure to the wire length and poor motor connector were common.
But it is still hard to proof what happen to your particular ESC, because there are so many variables including aging of semiconductives and caps tend to dry over the time.
And, yes capacitors close to ESC can minimize long wires impact. Different gauge, wire length and twisting also helps.

- I can reuse brains from your schulze...

[lutach]

Originally Posted by GriffinRU

Mr. Schulze correct (I can feel that Rene is going to kill me :)), long power leads can cause fatal failure. It is also related to the old FET drivers. And here is the problem if you have built-in protection than you will lose motor sync if you don't you can lose ESC. The best solution is to make that ESC MCU is monitoring such failure, but then you will have cogging as everyone hates. But that is what they trying to say in manuals about proper wire length and quality connections...
At the time when schulze was released such precautions were not a concern and failure to the wire length and poor motor connector were common.
But it is still hard to proof what happen to your particular ESC, because there are so many variables including aging of semiconductives and caps tend to dry over the time.
And, yes capacitors close to ESC can minimize long wires impact. Different gauge, wire length and twisting also helps.

- I can reuse brains from your schulze...

I'll send it over to see if it can still be used. Artur, please check this out and see if you can change brain boards and add another power board that I have: http://www.rc-monster.com/forum/show...?t=9624&page=9 (Post #126,127 and 128). Sorry to hijack the thread btw.

[kvrc]

Originally Posted by suicideneil

http://search.digikey.com/scripts/Dk...name=P10286-ND

I believe this is the same item...

griffinru or anyone else who has good knowledge of caps. will the abve cap be a good choice for any rc esc application assuming the battery is under 25V? also do you think using 2 instead of 1 will make any difference in cooling down a novak hv esc. they appear to be the same as the novak hv one except for the wires.

has anyone purchased a bunch of these and wants to get rid of a few?

Is it possible for the mamba max to run hotter because of an extra 2700uf 25v rated low ESR cap? I just soldered the Novak cap leads directly to the board (got a hot enough iron), and am still testing it. Just wondering if it may hurt performance on say 2s lipo.

[Pdelcast]

Originally Posted by Five-oh-joe

Is it possible for the mamba max to run hotter because of an extra 2700uf 25v rated low ESR cap? I just soldered the Novak cap leads directly to the board (got a hot enough iron), and am still testing it. Just wondering if it may hurt performance on say 2s lipo.

No, more capacitance means cooler running, IF the controller has a voltage ripple issue -- more capacitance = lower voltage ripple at the controller. Adding additional capacitance is almost never a bad thing... it just isn't usually necessary.

I DON'T, however, suggest trying to solder to the Mamba Max board -- it's a six layer, heavy copper (six ounces per layer) board -- and soldering to that board is SO difficult that we had to spend about twenty thousand dollars upgrading our soldering equipment at work to handle the Mamba Max board. It requires a very good quality high power iron to get the board hot enough for soldering without over-temp on the chips...

Patrick

Yeah....I figured that out the hard way. I broke out the butane soldering iron, let it sit for about 20 minutes on full gas to get it hot, then it still had a little trouble. I'm amazed at how much the traces soak up the heat!

I did get the cap soldered on there though, and no damage to everything. ESC runs at around 110F with a 5v fan and the cap, and around 125F during the middle of the day with the same setup using a 4 pole motor geared high with Mashers. I'm also running way too low of a timing for the 4 pole motor, so it's not working as efficiently as it should and probably heats everything up a little more than it should.

[GriffinRU]

Originally Posted by Pdelcast

No, more capacitance means cooler running, IF the controller has a voltage ripple issue -- more capacitance = lower voltage ripple at the controller. Adding additional capacitance is almost never a bad thing... it just isn't usually necessary.

I DON'T, however, suggest trying to solder to the Mamba Max board -- it's a six layer, heavy copper (six ounces per layer) board -- and soldering to that board is SO difficult that we had to spend about twenty thousand dollars upgrading our soldering equipment at work to handle the Mamba Max board. It requires a very good quality high power iron to get the board hot enough for soldering without over-temp on the chips...

Patrick

If it is so hard...can you offer me part's to improve your ESC?

And lets not go to capacitor importance business, I had enough with your other partner, I do have respect for you.

kvrcQuote:
Originally Posted by suicideneil
http://search.digikey.com/scripts/Dk...name=P10286-ND

I believe this is the same item...

griffinru or anyone else who has good knowledge of caps. will the abve cap be a good choice for any rc esc application assuming the battery is under 25V? also do you think using 2 instead of 1 will make any difference in cooling down a novak hv esc. they appear to be the same as the novak hv one except for the wires.

has anyone purchased a bunch of these and wants to get rid of a few?

It is alright, I would go with FM-type. If you need couple send me PM.

Five-oh-joeIs it possible for the mamba max to run hotter because of an extra 2700uf 25v rated low ESR cap? I just soldered the Novak cap leads directly to the board (got a hot enough iron), and am still testing it. Just wondering if it may hurt performance on say 2s lipo.

Yes, it is possible. External cap (boost cap , as I call it and some other manufactures) designed to compensate for long wires and poor connectors (or wearing out connectors, tear and wear... from continues usage).