RunRyder RC
WATCH
 1 page 1248 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 550 › 3GX gyro setup question
10-28-2013 01:40 PM  4 years agoPost 1
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

When I move the rudder in rate or head lock mode the tail servo jumps erratically. I just finished setting up the gyro and it was a bit of trouble to set the servo limits because it jumped around so much. It only jumps when I move the rudder stick. I might not have the radio setup correctly. If anyone has setup specifically for DX7 please let me know.

PM  EMAIL  Attn:RR  Quote
10-28-2013 05:03 PM  4 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

My Posts: All  Forum  Topic

I haven't seen that before. Is it jumping like that when you are in setup mode on the 3GX? I'd guess an issue with the servo itself, possible it has broken teeth on the gears?

PM  EMAIL  GALLERY  Attn:RR  Quote
10-28-2013 06:06 PM  4 years agoPost 3
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

It jumps in setup or flight mode. If I move the rudder stick. as the servo moves it will start jumping back and forth really fast like I am shaking the rudder stick, only faster than I could shake it. I will try to post a video this evening

PM  EMAIL  Attn:RR  Quote
10-29-2013 12:46 AM  4 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

DX7 (old) or DX7s (new)?

Standard external receiver connected with the cables that come in the 3GX box, or Satellite receivers only?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2013 01:11 AM  4 years agoPost 5
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

Ok, Old DX7 with satellites. No external receiver.
I'm trying to figure how to post a video.

PM  EMAIL  Attn:RR  Quote
10-29-2013 02:11 AM  4 years agoPost 6
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

PM  EMAIL  Attn:RR  Quote
10-29-2013 02:23 AM  4 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

One more question, which version of 3GX software is installed?

Actually, a few more questions. Have you gone through the DIR mode setup completely, have you gone through the rudder gyro setup menu completely?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2013 04:43 AM  4 years agoPost 8
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

Version 3.1
yes, I went through the DIR setup and when I got to the Gyro setup is when I saw the problem. All through the setup it jumped and I thought it would settle down once it was setup but it's still jumpy.
I may have something set wrong in my TX. I have the (input select) set
ANX2 to GYRO and GEAR to GEAR. I'm not sure that's right.
I then set the GYRO SENSING to AUTO with all modes to 0 for Headlock. I had it set to RUDD D/R for setup so I could put it in RATE mode. I have it set to 75% gain. This is the DX7. I tried to lower and raise the gain but no changes were noticed.

PM  EMAIL  Attn:RR  Quote
10-29-2013 05:07 AM  4 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

If using the gyro sense menu, values greater than 50 for those "POS" numbers put you in Heading Hold Mode. Values less than 50 for those "POS" numbers put you in Normal mode. This happens regardless of whether you use the Rudd D/R switch to control gain, or set it to AUTO mode.

"POS" indicates which position the Flight Mode switch is in (0/1/2) if using AUTO mode, or which position the RUDD D/R switch is in (0/1) if using RUDD D/R to control gyro gain through the Gyro Sense menu.

-----

Your old DX7 will default to use Channel 7 -- AUX 2 -- for gyro gain control when you turn on the Gyro Sense menu. That leaves channel 5 as default for running landing gear. (You CAN switch this, if you desire). Your DX7 defaults to having Gyro control out of channel 7 as the 3GX expects. If you're running a nitro heli you can use the three P-Mixes to control the Governor using channel 5.

Your device select setting is correct. When using satellite receivers, the 3GX expects rudder gain to be controlled via Channel 7/AUX2. The Governor speed control expects to happen out of channel 5. This is fixed and cannot be changed in the 3GX when using satellite receivers only.

-----

With version 3.1 software, go through the rudder gyro setup steps as you normally would, making sure to set left and right travel limits.

What you find later after all is set up, as the heli is just sitting still on the ground, as you move the rudder stick toward either end of its travel, the servo will follow to a point, will do a quick "jump" then settle down. I'm not sure what is going on, but it only happens as you get near the left/right limit, and jumps once. In the air, it behaves quite well.

The servo does NOT jump back and forth erratically, however.

-----

You would do well to check that servo by itself prior to plugging it into any FBL controller. If it is a standard pulse-width for neutral servo (1520 usec pulse), plug it into any channel of your RX and slowly move the associated control stick. Look for smooth movement. Erratic movement is indicative of a dirty feedback pot in the servo, perhaps a broken motor winding in the motor, one or more teeth missing or damaged in the servo, or a dirty stick pot in the transmitter.

IF this is an analog servo, make sure to select Analog servo (AS) in the Gyro setting sequence. If a digital servo, select DS mode.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2013 12:53 PM  4 years agoPost 10
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

Hi Dave
Very good info.
I will try to connect it to a different receiver to see what happens.It is the DS620 servo. I assume they are 1520 usec pulse.

PM  EMAIL  Attn:RR  Quote
10-29-2013 01:33 PM  4 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Yes -- DS620 is standard pulse width servo.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
10-31-2013 12:31 AM  4 years agoPost 12
dahodevil

rrNovice

des allemands,LA USA

My Posts: All  Forum  Topic

OK, I pluged the servo directly to my airplane receiver and it jumps around like popcorn. My airplane servo works good. So it's the servo. I guess I will be shopping for a new servo.
Should I go back with an Align servo?

PM  EMAIL  Attn:RR  Quote
10-31-2013 03:58 AM  4 years agoPost 13
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Nothing like a quick sanity check to figure out what the real problem is.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1248 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 550 › 3GX gyro setup question
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Sunday, October 21 - 3:16 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online