Mamba esc w4s & bec overheating..help? - RC-Monster Forums

DwightSchrute · 09:20 AM

Guys, i need some help...bad.....

I've got a mamba esc with the cc bec in my truck, and i've smoked 2 other escs this month. I'm runnning it in a Rustler vxl with a thunderpower 25c 4s 5000mah lipo and a neu 30c 4100 mah lipo with the vxl motor. I'm at a loss right now as to why it's happening.

I hooked it up just like they illustrated on the CC site except for one thing...

the bec wires that go to the esc that are supposed to be soldered to the connector that plug into the battery were soldered on each wire near the base of the esc....like this:

could this be the source of the problem?
I also eliminated the on-off switch...but i see alot of people do that.
is running the fan too much on the esc?
I bought the mamba specifically so i could run the 4s.....do i need any capacitors or anything?....

any help would be greatly appreciated.

Arct1k · 04.12.2008, 09:23 AM

Please could you take a pic of the rx - you removed the red wire on the MM rx lead I take it - A novak HV 2700uf cap or same could help...

04.12.2008, 09:24 AM

try gearing down ?

J.

DwightSchrute · 04.12.2008, 09:35 AM

Quote:

Originally Posted by Arct1k

Please could you take a pic of the rx - you removed the red wire on the MM rx lead I take it - A novak HV 2700uf cap or same could help...

yes, i removed the esc bec wire...sorry, i forgot to mention that....also, the RX is a traxxax e-maxx 3 ch but have used a 2ch futaba too...I have the servo plugged into ch 1, the esc plugged into ch 2 and the fan and the bec plugged into ch 3 with a y harness.

here's the pic...sorry it's so hard to see...i have a poor camera.

where would i attach the capacitor?

sikeston34m · 04.12.2008, 09:42 AM

The MM ESC should have no problem handling that setup.

Be SURE that you lift the red wire from the ESC to the Receiver. If you didn't, this is what's causing your problem. You can NOT have the ESC AND the BEC both trying to power the Receiver/Servo's.

IF you did lift the red ESC wire going to the Receiver, I would suspect there is something wrong with the motor.

Gearing? 4S is alot for the VXL Motor but you should be able to run it on 4S, as long as you keep temps in mind during long runs. Does it cog?

Have you updated the firmware in your ESC?

Your soldering job looks fine.

I'm using the MM/CC BEC in an E maxx setup. It performs GREAT. Power comes from 4S 5000mah 20C Lipos. I do have a Novak Cap added and a fan on the MM.

It will out accelerate AND outrun the T maxx on top end.

Can you post a picture of where your wires plug into the receiver?

DwightSchrute · 04.12.2008, 09:51 AM

yes, i updated the firmware the day i got it. :)

am i missing something?

i read in another thread about programming the bec through the castle link...but how do you do that? there is no usb port on the bec....

man...i'm lost.

sikeston34m · 04.12.2008, 10:09 AM

Oh ok. Take a look at this page:

http://www.castlecreations.com/produ...stle_link.html

Do you have the little thingie pictured in the upper right hand corner?

There is Castle Link software, then there is a Castle Link Module.

The USB cord plugs into the module and the module plugs into the CC BEC.

How hot does your motor run? Does it cog?

10:11 AM

http://www.castlecreations.com/produ...stle_link.html

You use this to program through the receiver lead of the bec.

Edit: sikeston34m beat me to it.

DwightSchrute · 10:58 AM

got it..... thanks!! so will changing the voltage make the bec make the esc run cooler? and what should i have it set at?

sikeston34m · 04.12.2008, 11:13 AM

Quote:

Originally Posted by DwightSchrute

got it..... thanks!! so will changing the voltage make the bec make the esc run cooler? and what should i have it set at?

Using a BEC will make the ESC run cooler, but the esc doesn't care what voltage the bec is set at. so the answer is No.

I have mine set at 6.0 volts.

If you're looking for ways to make your ESC run cooler.

Go back over your setup in the ESC. Turn the timing down some, and how about some punch control?

Just remember, you are powering a motor on 4S, that was really meant for 3S. This is going to make it draw ALOT of amps.

DwightSchrute · 04.12.2008, 11:22 AM

Quote:

Originally Posted by sikeston34m

Using a BEC will make the ESC run cooler, but the esc doesn't care what voltage the bec is set at. so the answer is No.

I have mine set at 6.0 volts.

If you're looking for ways to make your ESC run cooler.

Go back over your setup in the ESC. Turn the timing down some, and how about some punch control?

Just remember, you are powering a motor on 4S, that was really meant for 3S. This is going to make it draw ALOT of amps.

thanks...i think i might be geared too high as i'm hitting about 1850 watts when i should be at around 1400...i might need to also set the factory defaults back instead of having zero punch control and the timing turned all the way up...etc...i had everything set for the absolutest worst place to help cooling.

Also, would you recommend the HV capacitor? what exactly does it do?

E-Revonut · 04.12.2008, 11:22 AM

What is the fan everyone is running on the MM and how do u attach it?

DwightSchrute · 04.12.2008, 11:24 AM

this one...

http://www3.towerhobbies.com/cgi-bin...&I=LXKKN0&P=ML

i screw it directly into the heatsink..it's a perfect fit.

sikeston34m · 04.12.2008, 11:53 AM

Quote:

Originally Posted by DwightSchrute

thanks...i think i might be geared too high as i'm hitting about 1850 watts when i should be at around 1400...i might need to also set the factory defaults back instead of having zero punch control and the timing turned all the way up...etc...i had everything set for the absolutest worst place to help cooling.

Also, would you recommend the HV capacitor? what exactly does it do?

The Added Capacitor helps to smooth things out in the powerline.

There are several added advantages that it gives your setup. Without going into a lot of technical detail, it can help your ESC run 15 degrees or more cooler.

If you want more information on what it does, there are numerous threads here that discuss this topic. Be warned, it gets deep! LOL

Sounds like you might indeed be over geared. Try setting the timing on the lowest setting and give it some punch control. (50% or so). This will help tame those huge current spikes on startup.

DwightSchrute · 04.12.2008, 11:58 AM

Quote:

Originally Posted by sikeston34m

The Added Capacitor helps to smooth things out in the powerline.

There are several added advantages that it gives your setup. Without going into a lot of technical detail, it can help your ESC run 15 degrees or more cooler.

If you want more information on what it does, there are numerous threads here that discuss this topic. Be warned, it gets deep! LOL

Sounds like you might indeed be over geared. Try setting the timing on the lowest setting and give it some punch control. (50% or so). This will help tame those huge current spikes on startup.

thanks! I just re-programmed it and went down 10t in the pinion and up 10t in the spur.....

now.... got anything on getting the rain to stop?