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My ESC's keep beeping after connecting battery

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Hello all,

I've just finished my Quad F450 build and as I tried to power it on for the first time my ESC's keep beeping and the FCU doesn't power on. It this happening cause of a faulty/wrong connection I did or do I have an issue with something from my components? My build consists of :
1. Frame F450
2. Flight Controller Unit KK2.1.5
3. Motors x4
4. ESC's x4
6. Battery
7. Tx/Rx

Thanks in advance for any help and info you can provide.



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@DivenParker if the ESCs are not getting any signal from the flight controller they typically will complain by beeping. I see that you have a UBEC so I assume that the ESCs don't have one built in. The UBEC is takes the higher unregulated voltage from the battery to provide a stable 5v to the flight controller so I would check that this is working. Also the receiver also gets its power from this UBEC but maybe via the flight controller - can you tell if it has power ?. 

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