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HomeAircraftHelicopterAlignT-REX 700N › Burning out cyclic servos
01-06-2018 03:42 PM  8 months agoPost 1
jasonrusso

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Haverhill, Massachusetts

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I'm flying a 700N with a GPro and Align 610s. Over the summer, I burned out 3 cyclic servos. 2 times on the front one and once was a rear. They would start twitching while flying and it continued after landing. Thankfully it didn't cause a crash.

Swapping out the servo fixed the issue. After disassembling the servo I could smell burnt electronics.

There is no binding in the linkage, at one point I changed the swashplate with a spare I had because there may have been a burr in the bearing, but it wasn't bad enough to burn a servo IMO.

Is there something in the programming that can burn servos out? I know that too much gain can burn tail servos out prematurely.

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01-06-2018 04:04 PM  8 months agoPost 2
GyroFreak

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Orlando Florida ...28N 81W

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Is the voltage to the servos correct for the servo model ?

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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01-06-2018 04:21 PM  8 months agoPost 3
Flyin for Jesus

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Troy, IL. 62294

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Cyclic gain too high makes servos work a lot more.
Check temp of the servos after flying or even just a hover.

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01-07-2018 05:04 PM  8 months agoPost 4
Heli Fanatix

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Fountain Valley, CA

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Check your Servo frequency
- 200hz is recommended [corrected]
- DS610M have been known good for 4.8v ~ 8.2v

If everything checks out .. try dropping down to a lower swashplate fequency and take temp readings

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01-07-2018 06:57 PM  8 months agoPost 5
datidun

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N Ireland

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I know if there is to much Cyclic gain the head wobbles or you see kind of a shake.

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01-08-2018 01:44 AM  8 months agoPost 6
Pistol Pete

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Seffner, FL

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Heli Fanatix
Check your Servo frequency
- 333hz is recommended
- DS610M have been known good for 4.8v ~ 8.2v
Sorry mate but...
Cyclics are 200Hz (333Hz is for the 620 tail servo)
Voltage is 4.8 to 6V

I wouldn't run them at 6V.
5.5V is a happy medium.

~~Enjoying the hobby one flight at a time~~

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01-08-2018 02:06 AM  8 months agoPost 7
jasonrusso

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Haverhill, Massachusetts

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Check your Servo frequency
- 333hz is recommended
- DS610M have been known good for 4.8v ~ 8.2v
I run them at 6.0V regulated (Arizona Regulator).

Is there a setting for the servo frequency in the GPro settings? I know there is a pulse-width setting in for the tail servo.
Cyclic gain too high makes servos work a lot more.
Check temp of the servos after flying or even just a hover.
It's the off season up here (-1 degrees F this weekend), so it's repair season. I'll have to check the temp next time I fly. I'll try to set the gain lower. There isn't any head bobbing (I know what that looks like unfortunately) so I don't think it is too high, but maybe it is higher than needed.

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01-08-2018 09:25 AM  8 months agoPost 8
datidun

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N Ireland

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I have been using mine for 6 years with a Life 6.6v battery.

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01-09-2018 01:37 AM  8 months agoPost 9
jhhyah

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Taipei, Taiwan

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d
I'm flying a 700N with a GPro and Align 610s. Over the summer, I burned out 3 cyclic servos
i think ds610s is different from ds610. its for 550 or 600 heli. torque is smaller than that of ds610.

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01-09-2018 01:42 AM  8 months agoPost 10
co_rotorhead

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Centennial, CO, USA

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think ds610s is different from ds610
I think the "s" was used in the original post to mean plural -- as in multiple DS610 servos.

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01-09-2018 11:23 AM  8 months agoPost 11
jhhyah

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Taipei, Taiwan

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You may find the specifications for both 610s and 610. The torque are 8kg..and 12 kg at 6volt for 610s and 610 respectively .

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01-12-2018 01:42 PM  8 months agoPost 12
Richardmid1

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Leeds, England

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You may find the specifications for both 610s and 610. The torque are 8kg..and 12 kg at 6volt for 610s and 610 respectively .
There is no 610s, co_rotorhead cleared that up above.

You mean 610 and 620. 610's are cyclic, 620's are tail although can be used on cyclic on 600's.

Servos will burn out due to running too high voltage, too fast refresh rate (although both 610 and 620 should be ok on 333hz but ide stick to 250 or lower), and vibration either directly to the servo (not using rubber grommets!) or from vibration getting to the FBL gyros. Vibration getting to the FBL can be fixed by experimenting with different tape/pads or relocating the FBL unit or sensor. The best way however is to balance the main blades, tail blades, clutch and engine fan.

60% of the time, it works every time!

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01-12-2018 03:19 PM  8 months agoPost 13
ssrobzoom

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Tn

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Make sure your Servo horns are not rubbing against the top of the servo case. If so, file them down so you can see space between them when fully seated.
If you running the push/pull link setup, make sure both linkage are the same length and not binding against one another. If you hear constant servo humming your in a bind. also check you ball link to see if they are too tight, size the ball links as needed.

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01-12-2018 05:33 PM  8 months agoPost 14
Professor Fate

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Goose Creek S.C.

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Here's a long shot. How's the CG?

Welcome my son, Welcome to the machine

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01-22-2018 12:01 AM  8 months agoPost 15
jasonrusso

rrApprentice

Haverhill, Massachusetts

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Professor Fate
Here's a long shot. How's the CG?
It's fine. I'll have to recheck the balance.
co_rotorhead
I think the "s" was used in the original post to mean plural -- as in multiple DS610 servos.
Correct. I'm using a 620 on the throttle and a 650 on the tail.
Richardmid1
Servos will burn out due to running too high voltage, too fast refresh rate (although both 610 and 620 should be ok on 333hz but ide stick to 250 or lower), and vibration either directly to the servo (not using rubber grommets!) or from vibration getting to the FBL gyros
As I asked before, is there a setting in the GPro software for cyclic framerate? I know there is one for the tail.

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01-22-2018 11:12 AM  8 months agoPost 16
Richardmid1

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Leeds, England

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jasonrusso
As I asked before, is there a setting in the GPro software for cyclic framerate? I know there is one for the tail.
I doesn't say in the manual, it just says that the cyclics need to be digital with ideally a minimum of 0.08 speed and 12kg torque. There might be a setting in the PC software though?

60% of the time, it works every time!

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01-28-2018 06:44 PM  7 months agoPost 17
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Based on your comments, there is no good reason for the servos to burn out.

The servos are fully rated for 6v normal operation.

There is no setting in the GPro to change the refresh rate - I think it is set to 156Hz.
But, you can bet that the Align GPro's refresh is 100% compatible with all the Align servos.

I would look for external issue in the bellcranks, swash and head.
Binding ball-links and bearings in the bellcranks, stiff omni-bearing on the swash or binding main rotor grips.

If you are a hard 3D flying and there are external stresses / binding in the swash system (collective and cyclic), you are overworking the servos.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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