Feigao 540 9L and Warrior 9918 Controller
 

I just received my Feigao 540 9L and Warrior 9918 Controller.

After getting it all wired up (LHS did it for me) I installed it in my e-maxx. It seems to be doing some weird things and im not sure if its normal so that is why im posting on the forums.

Now my questions are:

Is it normal for the motor to make a weird noise when barely giving it any throttle? The motor doesn’t even turn, it just kind of kicks a little and makes a high pitch noise. (ive never seen any other motor do it before, but ive never owned a brushless motor).

Is it normal that the back of the motor cover comes off after a run??? I noticed it came a little bit off after my first run. I poped it back on but how do you stop it from coming off??

Is it normal that sometimes when at a dead stop and you give full throttle nothing happens but a little jerk on and off?? (does this off and on, both in reverse and forward)

Is it possible that the motor or speed controller is dead?

p.s. I followed the install instructions to the letter. It does run good sometimes, but i have the problems above.

MadDog,

I would go over you connections. Make sure they are all tight, and your batteries are fully charged, and make sure you programmed your controller. Checkout this forum for programming your controller. But what you described is not normal.

With brushless there is a thing called cogging. The is like a motor that stutters at first when you apply very little throttle but then goes away after a certain point when giving it more throttle.

Could be weak batteries or signal from your TX.

I know my brushless was ticking loud when I first tried it. It was due to my batteries not being fully charged. My fault.

Can you give us more info on the truck? Gearing, tires, batteries, etc.

patch

MadDog - first off - let me welcome you to the site.. I am sure that mike will address this when he gets on the forum ( i will call him and make sure he sees this thread - although i really dont need to, he never misses any post - which is good ) The high pitch whining noise if you are just barely touching the throttle is normal as is the jerking or back and forth motion when barely touching throttle. That is what patch described as cogging. As far as the back plate popping off - i havent heard of that. Im sure mike has a solution for that. Also - please make sure that the receiver batt (providing your using a rechargable) is fully charged. That has been a culprit of a bunch of probs for people in the beginning. Im sure this is an easy fix - Hang tite till mike responds to ya.. Once again welcome to the site - you will find a bunch of our members are very skilled and knowledgeable in this field ( brushless)....

MadDog and Patch: welcome to the forums to both of you! Thanks for jumping right in as well, Patch! Between what HotnCold and Patch have mentioned, the ground is pretty well covered, but I will add a few possibilities based on the information presented.

The weird noise at low or partial throttle from takeoff is perfectly normal. All the Warrior controllers do it (sounds like a whine almost) as they takeoff. No worries there. The back of the motor shouldn't come off, but it is only pressed on, so it certainly can happen. I should have a fix for this any time now. I am working on a prototype heat sink for the motor that also acts like a motor clamp, and should have these available soon.

The jerk you are describing from a dead stop (back and forth motion) is a result of low BEC voltage. This means your batteries are dropping below 5.5 volts (if you are running 12 cells, you have crappy batteries). This typically does not happen with a receiver pack in place, either. I think a good set of batteries and the motor clamp/heatsink I am working on will cure your problems altogether. Start with a nice set of batteries (try someone elses if you have the opportunity to see the difference). Stick with good batteries (stay away from orion packs or similar cheap packs, as they can't deliver the voltage/amps required to fully enjoy your system).

Answer thanks for your guys replys!! I really feel better now knowing that everything is normal.

I do have some cheap 1200 batteries, so that is probably the reason. I spent so much money on my emaxx that i forgot about buying batteries so that is the last thing i have to pick up.

Again thank you guys for your great support!!! :D

The batteries are definately the problem. I think you will need a diaper when you run some good cells :) . It will be a completely different experience. Glad we could help. Please reply back to this thread when you try some good batteries.

Ok i got a hold of some 7 cell 3300GP batteries. After running for a while the studering problem came back, but the truck seemed to have a lot of power still when it didnt studer.

The studering did get worse when the batteries starting getting lower, but it still just does not seem normal when it studers and the truck still has plenty of power.

Oh ya i think i forgot to mention that i have the External BEC/UBEC and i pulled the black tab out of the controller as instructed. Maybe this could be a cause of the problem?

Perhaps the soldering job on the UBEC isn't the greatest? Just a guess, but ti shouldn't act that way. You could try removing the UBEC to eliminate it as a possibility (use a receiver pack or the controller bec).

Everything is soldered solid.

I just had my 2nd run with the 3300's. Now with a fully charged battery it cuts out everytime. If i slowly give it gas it seems fine, but when i try a top speed run it cuts out. I also had the motor plate come off every few minutes.

Any other ideas?

OK i just had a run with the External BEC/UBEC and put the plug back into the Warrior. Its still doing it with fully charged batteries! Gosh this really sucks. It seems to do it worse when at a complete dead stop then giving it full throttle. It also did it at top speed.

Normally the UBEC can handle a voltagedrop, it has got his own voltage regulating/correcting circuit.

Okay, what i would like to know;

1-did you try a normal 6V batterypack (rechargable!)
2-what thickness of wires are you using between the bat/esc?
3-what plugs are you using between bat/esc?
4-have you got a few pics of your setup as installed?


you are running your truck on 7 cells only? This could be the problem; the setup is able to pull like 100A+ The voltage would drop till .8 volts. this is 5.6 volts. very critical..

In addition to serum's suggestions, I would also begin to wonder about your radio. If I am understanding your explanationss, though, it sounds like a BEC issue, which should not exist with the UBEC or receiver pack and 12 or 14 good cells.

Heres Two pictures of his maxx that I just took. Hes using the stock Tq3.
We are going to test it with the JRXS3 and see if theres a difference

www.rcbros.com/images/drewsmaxx/maxxside.jpg
www.rcbros.com/images/drewsmaxx/maxxside2.jpg

If you need bigger pics just let me know. I reduced the size on them for faster upload.

Okay, how about the other questions/suggestions?

I meant close-up pics of the wiring etc.

I will post some pictures of the wiring after i get a chance to test it with a new radio system. I want to see if that helps first.

Thanks for all you guys help!