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01-02-2014, 08:53 PM | #1 (permalink) |
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ZYX bouncing servo.
My front "elevator" servo just started doing this 30 degree bounce like cycle.
I can turn the Radio off, it does not have any effect on the servo. I changed out front servo with a new servo, did not have any effect. I rerouted servo wires, no effect. I changed gains and pids, no effect. It will randomly go away, maybe a few flights, but it comes back, its becoming more frequent. Sometimes the frequency of the bounce increases, but not by too much. If the bounce settles, sometimes I can trigger it by taping the heli gently. I am starting to think the zyx-s is broken, but I'm hoping not. I guess I should add, it can do this on the bench, or mid flight. Fresh battery or low battery, any head speed, even zero. It doesn't seem make a difference. Last edited by SkyKraken; 01-02-2014 at 10:09 PM.. |
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01-02-2014, 11:11 PM | #2 (permalink) |
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ZYX bouncing servo.
Oh wow. That does not look good. My first suspicion would be the servo pot going bad, but you say you replaced the servo with another and it acts the same way.
Then it's probably the ZYX. Sometimes the pin board of the ZYX gets a bad contact from the repeated strain of plugging in servos and/or vibes from the heli. Lead-free solder doesn't help the matters either. I suggest you open up the ZYX case and reflow all the connections from the pin board to the main PCB. Use very little heat and Sn/Pb solder and it's a 5 min job.
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CopterX 450 Black Angel FBL "Night Rig" | ZYX v4.0 PRÔTOS 500 FBL "Sky Whip" | Robird G31 Audacity P6 FBL "Phoenix" | MSH Brain | 12s Goblin Speed | iKon |
01-03-2014, 02:15 AM | #3 (permalink) |
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Thanks for the reply Doc.
I was out of ideas, that gives me direction. |
01-04-2014, 01:02 AM | #4 (permalink) |
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crab apples
Good news and Bad news.
I have another zyx-s, on another heli and I figured its winter, I'll just swap gyros and see what happens.. It wasn't that easy, ended up having to bind and completely reconfigure the gyro and I also used a completely new model in my radio from scratch. And the front servo bounce re-appeared. No joke. Bad news. So, I don't think its the gyro. Good news. It shouldn't be the radio. And I have replaced that one servo. I did recently change out the esc. Could the ESC cause a servo to do that? Lastly, I noticed it wont do the glitch until after I have spun it up, I think. I tried and tried, nothing will trigger the glitch, until after I have spun the heli up either on the bench, in my hand (its a small heli) or flown.. I am so confused by this, Doc, I'd love your thoughts.. ESC? Guess I could rip and replace that.. |
01-04-2014, 02:44 AM | #5 (permalink) |
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I get kind of a milder servo twitch like that when one of my three cyclic servos is dead.
List every component you have on the helicopter. Servos model number, ESC, receiver, etc. |
01-04-2014, 03:00 AM | #6 (permalink) |
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zyx-s
orange sat rx 100 talon 15a hitec 5035 ds76t |
01-04-2014, 03:31 AM | #8 (permalink) |
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130x
Quantum motor Dx8 4.02 Has well over 100 flights on it, maybe 200.. Settings are pretty normal, linear pitch curve, flat throttle. When the nic servo isn't doing that, it flies rock solid. When the nic, does that, I usually fly it to a hover and land it, all other servos remain working fine. Just the nic servo causes drastic height changes. |
01-04-2014, 03:35 AM | #9 (permalink) |
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http://hitecrcd.com/products/servos/...-servo/product
The specs for those servos only list 4.8V, so I'm wondering if they don't like running at higher than 5V? The Talon 15's BEC outputs at 5.5V 3A continuous 8A peak. http://www.castlecreations.com/products/talon.html |
01-04-2014, 03:44 AM | #10 (permalink) |
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Do you only have the RX100 satellite? Do you also have an Orange RX receiver, or a Spektrum receiver you could try?
Maybe it's not the servo that you swapped out that's causing the jitter, but one of the others that's in the process of dying. You get no weird behavior from any of the other servos? |
01-04-2014, 04:08 AM | #11 (permalink) |
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nope, no other servos have any oddities at all.
I was aware of the 4.8 hitec spec, but they have been working fine at 5.5. And when I popped in a new 5035, it would have tolerated the higher voltage for a while, faux cure until it was cooked, I think. Never thought about the RX going bad.. But its odd that it would make a single servo cycle up and down. The rx doesn't fail, or show a signal loss. In fact, I can turn the radio off and the servo keeps jumping. But, that doesn't rule out the RX, just a weird thing if its the sat. I just wish whatever was causing it, would just die already. So, I wouldn't have to swap out every component hunting for something that is sporadic. |
01-04-2014, 04:14 AM | #12 (permalink) |
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Maybe it's not the jumpy servo that's frying, but one of the others. Try unplugging each of the other two servos in turn and see if the jumpy behavior of the elevator servo stops.
Do you have the USB cable for that Talon 15? I wonder if you can set the BEC voltage to 5V in the software for it? |
01-04-2014, 04:35 AM | #13 (permalink) |
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I do have the usb thing, I'll check if the bec is programmable.
I can't make the servo jump on demand, I have to sort of fly or spin it up, it doesn't always do it, sometimes I can fly a few packs, but once it starts I can shut everything down and well, video it if I'm quick enough. Edit: Checked the castle software, No bec control.. sniff. But, I flew lots of packs with this setup before this started happening. |
01-04-2014, 05:02 AM | #14 (permalink) |
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You could try this ESC, and see if your HSG-5035HD's like 5V better.
http://www.hobbyking.com/hobbyking/s...arehouse_.html The BEC is linear 5V 2A. I would think 2A would be enough for those servos. They have a YEP 18A, but it's BEC is 5.5V 4A switching. They really need to add user selectable output voltage on their YEP ESCs. Or possibly get a step down for all your servos to run them at 5V...that's added weight though. Those servos are programmable, so I wonder if something got scrambled in one of the chips on one of the servos. |
01-04-2014, 05:03 AM | #15 (permalink) |
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Is the servo hot to the touch when it's doing its fits?
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01-04-2014, 05:16 AM | #16 (permalink) |
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Is there any mechanical binding? Do your blade grips rotate smoothly? Can your swash travel up and down the main shaft without binding and putting extra load on the servos?
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01-04-2014, 05:18 AM | #17 (permalink) |
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What servo settings are you using in the ZYX setup? 1520us all digital?
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01-04-2014, 12:24 PM | #18 (permalink) |
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Servos are always cool to the touch. Well, not the tail, it gets a hint warm,its the eflite.
All 1520 digital in the gyro. Nothing binding, no mechanical problems at all. Swapped out the Talon for a XP12a with 5v bec, didn't solve the problem. Swapped out the sat rx, did not solve the problem. Don't think the special sat cable could cause this. I am going to move the front servo to a back corner position, see if the problem moves with it. The only things I haven't replaced are 2 cyclic, 1 tail servo. If it ends up being the eflite tail servo, I'll be extra mad, the only component I hesitated to use. |
01-04-2014, 07:14 PM | #19 (permalink) |
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ZYX bouncing servo.
That's very strange, SkyKraken. I think your idea of swapping two cyclic servos around is a good test to see if the problem follows the servo, or stays in the same position.
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CopterX 450 Black Angel FBL "Night Rig" | ZYX v4.0 PRÔTOS 500 FBL "Sky Whip" | Robird G31 Audacity P6 FBL "Phoenix" | MSH Brain | 12s Goblin Speed | iKon |
01-04-2014, 07:17 PM | #20 (permalink) | |
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Quote:
The ZYX-S drives the tail servo at 333hz, when all 1520us digital servos is selected in the setup. It's possible that servo has issues at 333hz Pretty frustrating problem you have there. I hope you get it sorted out. I have a 130x also, and it loves to eat those stock linear servos it comes with. |
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