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Bluebird servo glitching BADLY!

ZiG

Rock Stacker
Joined
Aug 5, 2013
Messages
61
Location
Calgary
So I got a BMS660DMG servo for my SCX10 (BMS-660DMG+HS Super Strong Digital Servo (MG) 14.2kg / .17sec / 52g) and it's totally useless right now. If I move it really, reallllly slowly it will usually move, but as soon as I try to move it faster it will sort of twitch like it's trying to move, and then it just stops dead and the light on my receiver goes red for a sec.

I think it's drawing too much current. I tried it with a hobbyking 5a BEC, the stock HPI ESC, even tried the novak glitchbuster capacitor but nothing has helped. Hoping someone has another suggestion?
 
My guess is it's the cheap electronics in the servo itself. I have one at home for a test servo, and if I hook it up to my BR-XL ESC (which is known to have a very robust built in BEC) it makes the motor glitch and do odd things when I turn the wheel, as well as the servo itself jumping and jittering. But put it on a castle 10a external BEC and it's fine. I'll throw it on a watts up meter when I get home for you and tell you how much current it's drawing if you want. Just FYI, my Savox servos do the same thing.
 
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I agree. Sounds like a board in the servo went schizo. It can happen in any servo, but seems to happen in cheapos alot more. kinda like buying re-manufactured auto parts. It's risk/reward thing when buying cheap.
 
As promised, I put the bluebird on the meter, and it pulled just over 3Ah. I'm far from an expert in these matters, but from a little reading a lot of built in BEC's on ESC's are only capable of putting out something like 2-4amps. So either your BEC's can't supply the load once everything is powered up, or the servo is having issues and drawing more current than it needs.
 
Oops, guess I didn't hit submit earlier? Anyway, I figured you had a good point abut the bec and I ordered a castle bec. Just hooked it up and it works fine now. Thanks!
 
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