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HelicopterRadio - Futaba FASST › s9253 servo
01-03-2010 04:11 PM  7 years agoPost 1
Jamovich

rrVeteran

Bangalore, India

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Hi guys,

I seem to have an issue with my s9253 servo, which I am using on my throttle. I am using an ATG governor (first revision I think) and a futaba 14 TMZ. I noticed that on rare occasion the servo will stop responding to small stick inputs momentarily as if it has got "stuck". This goes away when I give a the maximum range (end to end) of input possible. This happens very infrequently and is not reproducible, so I am not sure if this is a servo going bad or something else. I have tried to set the ATG to INH, which does not seem to make a difference.

Any suggestions onto what the problem could be?.

Thanks for any help

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01-03-2010 08:39 PM  7 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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Motors in servos will develop dead spots if one of the internal winding terminations at the commutator breaks.

The motor will seem to run ok if you're going from end to end, or just moving quickly as the momentum of the rotating mass helps it spin past the dead spot. But if you move very slowly, or happen to have the motor stop with the bad commutator connection on the brushes, the servo will not move till you give it a bit of a push.

-----
Dave

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

Team Heliproz

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01-03-2010 09:13 PM  7 years agoPost 3
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i had this happen to two 9253 seros that i was using for throttle as well.

the problem both times were bad pot's.

send the servo to futaba for servicing, and they can swap out the pot.

Shawn
Team Leisure-Tech
Team HelixRC

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01-03-2010 11:37 PM  7 years agoPost 4
Yug

rrMaster

UK. Herts

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Sounds to me like a dodgy pot. 9253 is a great servo.

Vegetable rights and Peace

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01-04-2010 01:01 AM  7 years agoPost 5
JAYHELI

rrApprentice

Northeast Pennsylvania

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i have one on my tail servo on a raptor and it froze just about solid could barely move it by hand even with the power off

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01-04-2010 01:03 AM  7 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

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+3 for bad pot. The motors in 9253's are VERY, VERY good.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-04-2010 01:28 AM  7 years agoPost 7
Dilbeck

rrElite Veteran

Springdale Arkansas

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Motors in servos will develop dead spots if one of the internal winding terminations at the commutator breaks.

The motor will seem to run ok if you're going from end to end, or just moving quickly as the momentum of the rotating mass helps it spin past the dead spot. But if you move very slowly, or happen to have the motor stop with the bad commutator connection on the brushes, the servo will not move till you give it a bit of a push.

-----

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

Dave
Dam it, that explains the trouble ive been experiencing. I knew I wasent crazy after all!!!

Clint

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01-04-2010 03:15 AM  7 years agoPost 8
Jamovich

rrVeteran

Bangalore, India

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Sending the servo to futaba from where I live will probably cost more than buying it new...

Can these bad pots be caused by high frequency vibration (such as when runout in the clutch is not adequately set?) present in the heli?

*sigh*

Thanks for the info guys

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01-04-2010 05:01 AM  7 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Can these bad pots be caused by high frequency vibration (such as when runout in the clutch is not adequately set?) present in the heli?
Yes, and those same vibrations can also cause motor wires to fatigue and break.

-----
Dave

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

Team Heliproz

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01-04-2010 12:14 PM  7 years agoPost 10
Jamovich

rrVeteran

Bangalore, India

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Good thing I managed to adjust my runout properly a few days ago then lol...just in time.

With that in mind....should I "keep my eye out" on the other servos even though I have now corrected the vibration issues (they are running fine for the moment)?

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01-04-2010 09:54 PM  7 years agoPost 11
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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unfortunatly it is hard to tell a servo is on its way out until it starts giving problems.

A lot of the locals and i make it a habit to send our servos and any other high millage electronics back to Futaba (or JR) for servicing, just in case.

Shawn
Team Leisure-Tech
Team HelixRC

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01-05-2010 03:07 AM  7 years agoPost 12
Jamovich

rrVeteran

Bangalore, India

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Hmm.

Sending the stuff to futaba for servicing will be a huge pain (and probably expensive), as I am currently in India. Buying them new will probably cost less. Only sending very expensive equipment for servicing such as the 14 mz would make sense. Guess I will have to do a bit of research.

I guess if they go bad (I hope not) would make sense to get the BLS252s (F3C machine). They seem to be more resistant to vibrations etc. Currently using s9255s.

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HelicopterRadio - Futaba FASST › s9253 servo
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