Help!!- BRXL glitching with 2 servos

[arnesto]

I have the HH brxl and when I connect it to hitec HS-7955TG for steering and axial as-3 for shifting the motor starts to run and stop on its own.
Radio is turnigy GT3X (flysky gt3).
Unplug either servo and problem goes away.
This problem took out the receiver, luckily I had spare. Does it with axial radio set up too, as well as hobby king gt2 radio.
Never did it when running two cheap turnigy MI hi torque servos.
Also never did it with the hitec and one mi servo.
Seems like a bad combo of servos ?????
Will a bec fix this ?
Thought the brxl had a kick a$$ bec?
Why would it take out a receiver?

[Charlie-III]

While the BR-XL has a great internal BEC, even it can be overloaded.

Overloading is typically 1 of 3 things.

-Excessive torque rating (normal ESC's are good to ~200inoz total torque)
-Servo hitting a mechanical bind (can usually be fixed by setting channel EPA's)
-Failing servo

[Colgout]

Originally Posted by arnesto

I have the HH brxl and when I connect it to hitec HS-7955TG for steering and axial as-3 for shifting the motor starts to run and stop on its own.
Radio is turnigy GT3X (flysky gt3).
Unplug either servo and problem goes away.
This problem took out the receiver, luckily I had spare. Does it with axial radio set up too, as well as hobby king gt2 radio.
Never did it when running two cheap turnigy MI hi torque servos.
Also never did it with the hitec and one mi servo.
Seems like a bad combo of servos ?????
Will a bec fix this ?
Thought the brxl had a kick a$$ bec?
Why would it take out a receiver?

Look like your As-3 servo is shorted somehow. the problem only occured when this As-3 is used with another servo.

While the BR-XL's internal BEC is propably best in business, it is still struggling to power 1 hi -torque servo like your 7955, I guess it is too much to drive 2 especially it seems your as-3 is doubtful.

[JokersWild]

I would say you are pulling too many amps with the two servos. Either way I don't run any rig without a bec to each servo (unless its for a dig or shift ). I know that the 7955 on same esc, with a brood 30t will cause slight cut offs if you rail on the throttle so by adding another servo this does not suprise me. I say to add cc 10amp bec, jumped straight to the 7955 @ 6 volt and add a glitch buster cap to the rx for added security for the other servo.

[arnesto]

I just measured the voltage out of the BRXL, it is solid 5.9 volts on its own or with the 7955 plugged in, but when the AS3 is plugged in (on its own, or with 7955) the brxl voltage fluctuates any where between 5.1 to 5.9. There's got to be something going on with the AS3.
I think I will get a different servo, and run the 7955 off a CC 10 amp BEC (since I've got one).
The other weird thing is if I flick the steering wheel, as it jiggles back and forth I can cause the motor to glitch, even if it is full throttle- probably not a good thing. Will a glitch buster cap help with that too?

[Colgout]

Originally Posted by arnesto

I just measured the voltage out of the BRXL, it is solid 5.9 volts on its own or with the 7955 plugged in, but when the AS3 is plugged in (on its own, or with 7955) the brxl voltage fluctuates any where between 5.1 to 5.9. There's got to be something going on with the AS3.
I think I will get a different servo, and run the 7955 off a CC 10 amp BEC (since I've got one).
The other weird thing is if I flick the steering wheel, as it jiggles back and forth I can cause the motor to glitch, even if it is full throttle- probably not a good thing. Will a glitch buster cap help with that too?

When the motor glitches, does the Rx light flicker as well? A cap on Rx will help.

Told ya the As-3 is faulty...

[JokersWild]

Originally Posted by arnesto

I just measured the voltage out of the BRXL, it is solid 5.9 volts on its own or with the 7955 plugged in, but when the AS3 is plugged in (on its own, or with 7955) the brxl voltage fluctuates any where between 5.1 to 5.9. There's got to be something going on with the AS3.
I think I will get a different servo, and run the 7955 off a CC 10 amp BEC (since I've got one).
The other weird thing is if I flick the steering wheel, as it jiggles back and forth I can cause the motor to glitch, even if it is full throttle- probably not a good thing. Will a glitch buster cap help with that too?

Like asked above does the rx light flicker? More likely it is, due to like I said the 7955 will draw quite a bit out of the esc. The glitch buster is a cheap temp fix to using an external bec. But if you use a bec wired directly to the servo (do a search if you don't know what I'm talking about) that will fix that problem all together. But by adding a glitch buster to carry any type of load the other servo running off of rx may present is a good 5 dollar insurance you will never have to worry about.

[arnesto]

I'll check on the rx light, the thing worth mentioning is these glitches also happen with no loads on either servo (ie steering in neutral and shift not binding).

[Colgout]

then you may have other issue. is the esc very close to the rx?

[arnesto]

Ok the light on the RX does not flicker, the esc red light flashes each time the motor runs on its own.
The ESC is about 4 inches away from RX.

[Twisted Nuts]

Coming from the man that designed the software for the BRXL.
http://www.rccrawler.com/forum/electronics/411201-yes-you-need-external-bec.html#post3998836
I've never owned anything that didn't have an external CC BEC.

[JokersWild]

Originally Posted by arnesto

I'll check on the rx light, the thing worth mentioning is these glitches also happen with no loads on either servo (ie steering in neutral and shift not binding).

If they are powered on then they have some amount of load holding them at neutral. Either way it sounds like that cheap servo has an internal issue. Pull it and hook up another servo, just set it in the rig somewhere un installed and then run the rig.

Red light on mine flashes in rev and flashes green in forward. May be the flashing you speak of?

[craddock35]

Most every rig I know of runs a bec per servo. I have never even ran a servo over 100 oz off the esc much less 2. The internal bec is limited as to what it can do. The HH brxl is probably the best out there but even he says you need a external bec. It looks like this has been said many times over in here. I also see some saying one of the servoes is bad but I wouldn't count it bad till you try it out straight from a bec. If you still have issues with it then get a different servo.

[arnesto]

Originally Posted by JokersWild

If they are powered on then they have some amount of load holding them at neutral. Either way it sounds like that cheap servo has an internal issue. Pull it and hook up another servo, just set it in the rig somewhere un installed and then run the rig.

Red light on mine flashes in rev and flashes green in forward. May be the flashing you speak of?

Yep that is the RED reverse light on the ESC.
Seems ok with a different servo (for shift) haven't tried a different steering servo as I will try running the hitec off a BEC when I get a chance.
It still glitches when I flick the steering wheel - but I will try a different transmitter and see what happens.

[Twisted Nuts]

You NEED a bec. You'll end up over amping the internal BEC and you'll be buying a esc and a bec if you keep pushing it. Sounds to be glitching from brownouts.