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04-30-2004 04:13 PM  13 years agoPost 1
Polariman

rrApprentice

Annandale, Minnesota

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I am running into a problem with the helicam. I have a gasser with the G23 in it. I am running all digital servos except a FMA mini for the camera shutter. The shutter servo is on the gear channel. It has worked fine up until now. Whenever the motor is running, idle or high throttle, the mini servo turns to an extreme and twitches. When you shut off the motor, it works fine. I tried to switch the mini out to a Hi-Tec and the same thing happens. I have good voltage. I am running PCM. What is the deal?

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04-30-2004 04:19 PM  13 years agoPost 2
nivlek

rrProfessor

Norfolk England

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Sounds like a vibration problem.Either that or you are picking up interference in the servo lead, you could try fitting a toroid.

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04-30-2004 05:19 PM  13 years agoPost 3
daggit

rrElite Veteran

Claremont, MN

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are you sure that's the only servo twitching?

all of them would twitch if it's a reciever or battery connection.

othewise I would be suspscious that your downlink wiring (especially the 12v or antenna leads)may be in close proximity to your camera servo leads.

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04-30-2004 05:33 PM  13 years agoPost 4
heliraptor

rrKey Veteran

Colchester, Essex, UK

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Hi

Little test for you.

Get a dremel, put a nail in it the same dia as the chuck, bend it slightly.

Switch the dremel on (Out of shape nail causing a small vibration) hold the case of the dremel against the servo body and see what happens.

I had a problem this week I was tracking down on a 4 servo ccpm system in my scaler, it twitched badly. Caught a bad servo trying this, something I couldn't replicate on the ground until it reached hover revs.

This identified it.

Worth a try to see if it a dry joint etc on the board.

Lee

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04-30-2004 07:47 PM  13 years agoPost 5
Polariman

rrApprentice

Annandale, Minnesota

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I have done some diagnostics on the problem and this is what I have found. I disconnected the Rx switch dismounted the Rx and the battery. Still twitching. I replace the Rx with a spare and same thing.

I have a 12” servo extension to the mini shutter servo. I took off the extension and plugged the servo right into the receiver and problem solved. I added a 6” extension and back to twitching. I have noticed that the mini servo lead is a smaller gauge wire. Does this mean that it is not getting enough voltage?

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04-30-2004 08:47 PM  13 years agoPost 6
Polariman

rrApprentice

Annandale, Minnesota

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I take it back. I got everything re installed and the darn servo is doing it again (without the 12" extension). When the servo twitches, it will not respond even slightly to a command. As soon as you shut off the motor it is fine. I am kicking the dog now. Any ideas?

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04-30-2004 08:53 PM  13 years agoPost 7
Polariman

rrApprentice

Annandale, Minnesota

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It seems to twitch in tune with the motor speed.

The whole system was working great until last weekend. So it is something that just came about.

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04-30-2004 11:33 PM  13 years agoPost 8
Polariman

rrApprentice

Annandale, Minnesota

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Problem Solved. The entire helicam is carbon fiber so there was a charge building up. The camera gimbal and camera strut are both isolated from vibration by rubber gaskets. Therefore the camera gimbal was not GROUNDED. I ran a bare wire from the main frame to the gimbal and problem solved. I got the idea from previous posts on RR. Thanks guys.

Dewey

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04-30-2004 11:35 PM  13 years agoPost 9
electro212

rrVeteran

Lancaster Pa

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good job
i do like the bent nail trick as well

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05-01-2004 01:15 AM  13 years agoPost 10
daggit

rrElite Veteran

Claremont, MN

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good job Dewey!

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05-01-2004 05:57 PM  13 years agoPost 11
pilatus turbo

rrApprentice

Brandon, MS

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Polariman can we see a picture of what u did

Polariman,
Can we see a picture of what you did? I think I have a similar problem every now then.
Regards,
Hector

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05-11-2004 03:36 AM  13 years agoPost 12
Polariman

rrApprentice

Annandale, Minnesota

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Here is what I did to fix my grounding problem.

Dewey

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