Bec\ubec .. Supposed to be simple.

[NaC]

Running savox sc-1268sg
Cheap bec
Traxxas older 3chnl on crystals.
Using y harness

Browning and glitchy. Servo is loud thats normal. Im pulling signal amd ground from rx should i just be using sig? Its a painted steel chassis built by me. Should i ground my chassis?

[NaC]

Here is y harn. I am using.

[NaC]

https://holmeshobbies.com/electronic...s-adapter.html

[ferp420]

My guess would be not enuff amps Savox servos use alot of power your cheap bec probably isent strong enuff for it my bec pushes 8amps and my savox still had issues with gliching and overheating

[Hydrocarbon92]

If using that adapter correctly, there is no way the servo would brown out the receiver. The ESC should have all 3 wires go to the receiver, yellow/black on that servo harness to the receiver, yellow/red/black end to servo, and red/black to external BEC. The key to avoiding brown-outs is to power the receiver totally separate from the servo, and the ESC can do that just fine.

That servo could be beefy enough to overwhelm a cheap BEC. 3-5A peak isn't uncommon, and many cheap BEC's can barely do 2A...but stamped with claims of 3A continuous & 5A peak.

Keep all wires as short as possible too. Some servos don't like multiple extensions, as the low voltage signal becomes weak.

[NaC]

https://www.google.com/search?q=heng...P0LlkNRo_3exM:

8a output with 12a burst. Set on the 7.4v setting.

When wheels are off ground it seems fine but regular use it wont center, turn and seems to lack all power. Also is affected by throttle\brake\reverse input..

Would it hurt if i removed grnd from receiver? Yes its being powered by esc which is on the crawler mode could that affect it? Savox says that servo can run 2s unregulated should i just get a small 2s pack for it? Didnt really want that weight since rig is getting closer to 8lbs

[NaC]

Update: using 7cell nimh pack. The bec light dims to off when using fwd\rev. If not using throttle trigger for a few seconds the steering works well. How do i remedy this one? Seperate bec battery right?

[Hydrocarbon92]

Take clear pics of the wires/bec/battery/servo because I am certain you have something wired wrong. This is like hitting the wipers on a real car and the throttle blipping itself - it all points to a wiring issue. I have that same BEC and it works perfect, but I am also 100% certain mine is wired correctly.

When you mention it's grounded via the receiver, is that the BEC's only ground? A BEC should have it's main power/ground wires direct to the battery, and an ADDITIONAL wire connecting to the receiver's ground. If you only ground it to the RX, that means the return in that circuit has to pass thru the RX and ESC before back to the battery.

Another thing, is that pack at 100% charge? BEC's need about 1-1.5 volts higher input than output, so if that battery is nearly dead and you're on the 7.4v setting it's very possible it's output voltage is now horribly unstable.

[Hydrocarbon92]

Here's a picture of mine, the fact it's in a diff tube and 4WS shouldn't change things.

Power to BEC direct from battery via 2mm bullets. Output red wires ONLY go between BEC and servo leads. White signal wires ONLY go between servo and RX. Additional ground wire tee's thru the servo adapter harness, but main ground is between servo/BEC/battery. It's powering a 20kg and 32kg servo with zero glitching, WP1080 esc and 3S battery.



Note the servo connectors with only the white/black wires would normally plug into the RX, but not here since there's an additional 4WS controller.