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Radio - Servo - Gyro - Gov - Batt > Spartan DS760 strange problem
 
 
dennis052
Senior Heliman
Location: San Diego, CA, USA

I installed the Spartan Gyro in my Trex600E for more than 2 months. I have set the servo type to II for Futaba 9256 servo, type II meaning 760us to meet the narrow pulse of this particular servo and I got the confirmation by 2 flash LED. I have been flying the heli and no issue, solid performance. However, I take the heli to fly and good in the beginning including rolls, flips, backward inverted and attended two piro flips, oh oh, tail was out of control, swinging left and right and I tried my best to auto the heli in one piece, almost crash and fortunately no damage. The servo was acting strange as it jitter liked humming bird. My friends around was shocked and they have never seen anything like this.

I thought my tail servo was acting up causing this strange problem. It was not, upon checking settings on the Spartan gyro, the gyro changed the servo type to III (1520us pulse) by it own in the middle of flight. How was this happened? I have to change it to type II and everything ok again. I am scare now and need to contact Spartan soon to check the firmware, or any known issue. Now, I ground my T600N and 600E (both have DS760 gyro) until I know what cause the settings change.
06-13-2008 07:06 AM
 
 
RappyTappy
Elite Veteran
Location: Las Vegas, NV

Mine did this once too, I don't know what happened?

Chris
Xero G

Forever Brothers
Mickey Tylo
06-13-2008 02:10 PM
HOMEPAGE  
 
 
dennis052
Senior Heliman
Location: San Diego, CA, USA

Maybe this is a real issue. Too bad I sold all my 611 already. No fly until problem resolved.
06-13-2008 02:25 PM
 
 
Mark D
Heliman
Location: The Earth

Me too

Add me to the list my BRAND NEW one just did the same thing.
Drove my tail servo hard over and locked, lucky it was on the ground.
Found the servo type had changed from what I set it too initialy.
Firmware V1.07

Not impresed!

Mark
06-14-2008 06:02 PM
 
 
dennis052
Senior Heliman
Location: San Diego, CA, USA

Make sure you use the flash link to set all the settings back to default value. The gyro react in opposite direction even I correct the servo type. I use the flash link the check the settings and alot of settings have been changed not only the servo type.

I still not able to find out why and what was happening. Maybe radio link has a glitch, or reset that causing the gyro in programming mode and changing the settings randomly. Keep in mind that the gyro can be entered in programming mode by the signal from the rudder channel and power up/ down sequence. Therefore, I don't see problem like this in GY611 as the programming mode all via the module UI only.

I am trying my best to eliminate any chance to have power supply glitch and also upgrade the firmware. This is a real short coming of this gyro. I hope Spartan can solve this problem.
06-15-2008 04:58 AM
 
 
jester4
Key Veteran
Location: Brampton, Ontario

I think my name needs to be on this list too. Had it happen to me this weekend also. I don't have a flash link, but the servo went hard over, and started to piro like crazy, auto'd it in, and when I tried the tail in HH, it would move with my stick commands, but not stop where I left the stick, but rather go hard in one direction when I let go of the stick. Turn the system off and on, and everything seemed normal.

When I landed, the gyro was flashing with no stick commands.
I hope I can figure out what happened.

NO SOUP FOR YOU!!
06-16-2008 08:30 PM
 
 
Angelos
Key Veteran
Location: nr Oxford, OX11, UK

The ds760 does not access the configuration memory during operation. It runs from a copy it creates in RAM at power on. This means that if the configuration memory gets corrupt for any reason the effects should only show next time you power on. This makes me thing that the gyro very likely did a non clean reboot in flight possibly as a result of a deep voltage drop or severe static glitch. From the thousands of gyros we sold this is the first time I hear about the configuration memory being affected in any way or reason. If you gave any particular concerns about it please create a support ticket on out website and we can arrange to have these gyros tested.

-Angelos

Spartan RC R&D - Visit us at our local club www.helicollective.org.uk
06-16-2008 09:56 PM
 
 
Mark D
Heliman
Location: The Earth

Angelos,
Yes I hear you and I would aggre. But what happend is fact.

Rudder sitting normal moving as the heli is moved then moved to what would have been approx the max end point then stopped for maybe less than a seccond then over too where the servo arm was hard over against its stops.

Don't beleve its power related as no collective input was happening at the time. (was checking pitch with pitch guage) at center stick.

I also beleve its more common that you wish to think. just see the posts on another fourum. You have 4 people so far in this post.

If it is capable of an "Dirty" reboot thats %100 a design problem. That could be the case as the Gyro stops responding. Could you not have used a watchdog timer for instances like this where code starts running wild and stamping on it own code.

Time to get the code and circuit diagrams out and "ask what if" me thinks!

Trying to be objective but at the same time peaved after waiting weeks for my gyro to be deliverd and now I still cannot fly my heli becuse of a suspect gyro.

Mark
06-17-2008 12:08 AM
 
 
RappyTappy
Elite Veteran
Location: Las Vegas, NV

I know it was not a power problem with me. I've been using the same receiver/power system for quite some time before and after I tried the Spartan with never a lockout or glitch ever. It was weird, worked great one flight, then the next power on, servo went full over. I was troubleshooting trying to get into set up mode which sometimes proved a 5 min procedure getting the timing right and evenutally found the servo type was reset after quite some time. The gyro did fly fine after that weird quirk, but definitly had me scratching my head.

Chris
Xero G

Forever Brothers
Mickey Tylo
06-17-2008 12:14 AM
HOMEPAGE  
 
 
dennis052
Senior Heliman
Location: San Diego, CA, USA

Hi Angelos,

I am a bit agree with you about the voltage drop creating this unclean reboot of the gyro. I have been using this gyro for many times and no problem. It only happened as I was leaning piro flip and I don't have good collective management, plus I have cyclic move to four extreme corner by accident. This may cause too much current draw as the servos went to extreme. In fact, after the first 'Very Ugly' 'piro-flip', I hear the motor spin up and down that may indicated receiver reboot, and the tail went crazy after that, maybe what you meant by unclean-reboot in the middle of flight.

However, is there any way to avoid un-clean reboot as it is very dangerous for the gyro re-programmed itself in the middle of flight, or I should say to avoid re-programming problem no matter what happened to the power supply system? It is hard to avoid radio link glitch or not experienced pilot with bad collective management skill that will cause power surge. It is bad to see the gyro went crazy after this unexpected glitch or surge.
06-17-2008 12:24 AM
 
 
Spartan RC
RR Advertiser
Location: Oxford, UK

EDIT: Reposting below from personal account since I used that for my previous post.
06-17-2008 12:53 AM
HOMEPAGE  
 
 
Angelos
Key Veteran
Location: nr Oxford, OX11, UK

Mark,
On the forums such threads attract attention from all sort of unrelated issues and create panic. jester4's post above for example is totally unrelated issue from what you experienced. My best guess for that is that the gain channel glitched making the gyro see the three toggles of the switch and recalibrate the stick neutral. This could happen (and has happened) to Futaba gyros too as they use the same method for recalibrating the stick neutral without powering off.

The ds760 has watchdog timer and several other safety features. In fact 1.07 it is able to do bumpless reboot in less than 200mSec skipping calibration and you won't even notice it until you land an see the LED blinking the "error" pattern. However, there is always a limit on what an electronic device can do. When power is cut and restored a few times in quick succession internal operations are interrupted unpredictably and sometimes the program can loose its normal flow too. Even with the watchdog timer several hundred instructions could be executed before watchdog it kicks in. It increases the reliability of the system without doubt but it is not the answer to everything.

-Angelos

Spartan RC R&D - Visit us at our local club www.helicollective.org.uk
06-17-2008 12:56 AM
 
 
Angelos
Key Veteran
Location: nr Oxford, OX11, UK

Quote 
evenutally found the servo type was reset after quite some time.

The servo type is intentionally reset each time you configure the gyro via the sticks. Thus if you have set S9254 for example via the PC software it will go back to default as soon as you do a change via stick programing.

-Angelos

Spartan RC R&D - Visit us at our local club www.helicollective.org.uk
06-17-2008 01:04 AM
 
 
jester4
Key Veteran
Location: Brampton, Ontario

Angelos,

In my haste to post I had forgotten to mention that the servo type had re-set as well, so my post was related, but I don't have a cable to really check anything else. I love the gyro, so I hope you don't think we're shooting down a good product, but this was the third time something weird had happened to me with the gyro/servo. After the 3rd time I think I want to get to the bottom of this whether it's the gyro or something else going screwy with my set-up.

Originally I thought after the first incident, that the carbsmart was causing something weird, and I unplugged it, and the issue seemed resolved for the next few flights, then it happened again out of the blue. I'm running a lipo rx battery, which has some miles, so i'll try swapping it for a new one and see (although I did load test the battery and it seemed solid).

NO SOUP FOR YOU!!
06-17-2008 02:27 AM
 
 
murp
Senior Heliman
Location: Nova Scotia, Canada

I had an incident tonight that sounds similar. I have been having solid performance from the DS760 for the last 70 flights on my Vibe 50. Tonight however the tail just let go and swung back and forth during slow flight. I had no control during the swinging, then it just stopped and I regained control of the tail so I could land.

I have a USB Flash-link sitting unused since I bought this gyro. So I plugged it in for the first time and read out my settings. I didn't see anything out of the ordinary. I have firmware version 1.07, I am planning to upgrade to 1.08.

I am really concerned that this problem could re-occur and cause carnage. I have a solid Rx battery and regulator that has never caused my problems before.
08-12-2008 01:19 AM
 
 
jphilli
Veteran
Location: Marietta, Ga.

There's firmware version 1.08 for a reason. Head over to the Spartan website and see what's been changed.
08-12-2008 03:47 AM
 
 
jester4
Key Veteran
Location: Brampton, Ontario

An update on my scenario...

I swapped out the battery (2S lipo) for my old relion 5200 pack, and the problem went away. I think I may have had a cell going bad under load I guess. I still have the original firmware that shipped with the gyro from January. So all is good....

NO SOUP FOR YOU!!
08-12-2008 02:11 PM
 
 
sid-fmx
Senior Heliman
Location: Las Vegas, NV

Had a problem like this today. I set up a brand new 450 with a new DS760 today. First and second flight was fine. Third flight in a hover the tail swung back and forth in the exact same manner as entering program mode. It was about 20 second into the flight with a fresh battery. This is a brand new one that I just got in the last batch from readyheli so I would amagine it is a recent version software. The gyro still held fine after it did its swinging back and forth and was able to land it. Why did this happene and what do I need to do so this doesnt happens again.
10-18-2008 10:32 AM
 
 
sid-fmx
Senior Heliman
Location: Las Vegas, NV

Any Advise?
10-19-2008 05:21 AM
 
 
dennis052
Senior Heliman
Location: San Diego, CA, USA

I bought this and also upgrade the fireware to 1.08, no problem so far after more than 60 flights.

http://www.readyheli.com/SPM1600_Sp...r_p/spm1600.htm
10-19-2008 05:41 AM
 
 
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