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Possible short with metal screws
250 3 2020-10-13
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theprisoner6666
lvl.4
Hong Kong
Offline

I seem to have a problem with my air unit camera. I use a carbon GEPRC HD5 frame, and when I connect the camera to the carbon frame using metal screws, it makes the motor behave really weird. They start to make a pulsing noise and act very eratic. However, when I unscrew the screws slightly, the issue stops. Has anyone else noticed this problem? It didn't do it when I used a Frsky XM+ connected to SBUS, it only started doing it since I moved to the DJI FPV controller and I started using SBUS into the FC via the original DJI cable harness. Is this a common issue and I should just use nylon screws? Or is there a bigger issue?

Thanks.
2020-10-13
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Fritz Wlan
lvl.3

Germany
Offline

This is a known issue. Electrically isolate the camera from the frame. Use a non metal mount. The camera may not contact the carbon of the frame. When snug electrical tape and nylon screws are an option. Be sure to eliminate other gnd to frame short curcuits. Common issue are motor screws touching a winding of a motor or ESC pads touching the air unit. SMA connectors may not touch carbon.
The frame may have no contact to gnd at any point.
2020-10-13
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mc54
First Officer
Flight distance : 1030 ft

United States
Online

I fly an Armattan Badger HD, and it has a metal camera mount and metal camera screws. I've never had a problem like you describe.

But if nylon screws made the problem go away, I think you just solved your problem!
2020-10-14
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mc54
First Officer
Flight distance : 1030 ft

United States
Online

Dupe
2020-10-14
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