servo interference problems

[greenman407]

When I get near 1/4 throttle the servo thats hooked up to my apc twitches back and forth. Could it be a problem with apc sensitivity? I have installed 3 capacitors on the motor as recommended but no change observed. what should I do next?

[Guest]

I experienced similar problems with

I experienced similar problems with an APC.

Are you using a ESC with a BEC?

If so disconnect the BEC, and try running the radio from either a separate BEC or it's own set of batteries.

Unfortunately some ESC's BEC's are inherently noisy, and APC's seem particularly prone to interference from motor noise feeding back through the wires.

Andy

[greenman407]

interesting proposition. but in this

interesting proposition. but in this case my speed control already has the bec disconnected because I was told that its bec was not of sufficient capacity to handle the load so I installed a subtek bec and disconnected the middle wire(red) from the speed control wire harness. the only way to eliminate the twitch so far is to remove the apc. im going to try running like that and see if its livable. I have also tried a reciever on a different frequency with the same results. Wonder if its a faulty apc.

[raalst]

check (measure) the voltage on

check (measure) the voltage on the battery poles inn the sub
while operating the transmitter.

If it sinks below say 5 volts, your batteries cannot provide enough current
(and when that happens the voltage drops).

all R/C devices need about 4.8 volts to operate reliably.

also, sometimes the servo's go bad and use far more current than expected.
you might try swapping the servo's one by one and check if the problem
goes away

hope that helps !

[greenman407]

Thanks for the tips. Its

Thanks for the tips. Its not the batteries but the servo idea has merit. thanks p.s. Its only the servo that is hooked to the apc. The other servo is rock steady

[Guest]

You could still be getting

You could still be getting interference from the ESC with the BEC removed.

Disconnect the ESC from the system, if this cures the twitching, then you need to be looking at a different ESC.

Andy

[greenman407]

Thanks subculture, actually I have

Thanks subculture, actually I have tried ESCs from three different sources(atomic subs,subtek,and Hitek). Have also worked with BECs hooked up and removed.I recently removed the APC and have had no further glitching. Will the sub work OK without the APC? Ill have to wait until this weekend to find out. thanks

[pirate]

Greenman,

I had the same problem

Greenman,

I had the same problem with mine. Only the the APC servo would twitch. I was using a Subtech BEC. Then the BEC burned out, so I replaced it with another Subtech BEC. This time when it burned out, it fried my apc, ESC, and two other servos. So I replaced the ESC with a Mictotech Viper with a built in BEC. Problems solved. No more twitching on the new apc servo.

I messed with this problem for three years. Replaced the ESC twice, the APC twice, and went through three BECs (all BECs and APCs were Subtech) Subtech even replaced one of the APCs because of the problem, but then the new one started doing it too.

The one common factor in all of it was the Subtech VR/BEC. Once I replaced it with the one built into the Viper ESC after the last one fried everything (luckily not the receiver), problem's solved.

The Microtech Viper ESC is also water tight,so if you want to avoid overheating problems you can mount it outside in the wet spaces.

Pete

[greenman407]

thanks pirate, guess what? http://www.subcommittee.com/forum/icon_idea.gif

thanks pirate, guess what? I also was using a subtek bec unit. its gone now. ill find out this weekend how well everything works. ill post to this forum my results. thanks

[greenman407]

Good as my word ,I

Good as my word ,I ran my albacore today without any servo jittering but without the APC. I can tell you that an X-tail without an APC is like driving down the road and taking your hands off the wheel.It may take one second or five seconds but one thing is for sure, it needs constant course corrections.So ill put the apc back in and continue on trying to solve this problem.

[Guest]

Have a look at this

Have a look at this linked article, and works through all the processes to ensure you have done everything outlined.

http://www.modelsolutions.ca/articles/R ... ch2006.pdf

http://www.modelsolutions.ca/catalog_rf ... ession.htm

Andy

[greenman407]

Thank you very much Subculture

Thank you very much Subculture . I will carefully read both of them. I have made some adjustments to my sub and will be test running it tommorrow. I will then post the results. Thanks to all for your help!

[greenman407]

Interesting, after determining that the

Interesting, after determining that the Albacore will not satisfactorily run without an APC I hooked up the apc again, this time with the subtek mixer and so far I have not experienced it again.Now I have a different kind of jittering of the planes, back to the old problem of mixer and APC fighting it out. However disturbing it is to see my rudders and planes jittering it runs at periscope depth quite nicely.Im happy for now.

[raalst]

if an apc is a

if an apc is a device for running at a fixed level, my level keeper (LR, by norbert Brüggen) jitters all the time. When enabled, my Kilo
wags it's tail(-planes) like a happy puppy
it is just a very sensitive device.

[greenman407]

Raalst, Thats interesting. My planes

Raalst, Thats interesting. My planes and rudders jitter back and forth very rapidly and its not constant. It will do it for a couple of seconds and then stop for five or more seconds and then start all over again. Because the movements are so rapid thats probably why there are no handling problems.
Wish you well.