How to connect BEC to the servo rail?

Navio / Edge Hardware
1

In the hardware setup there is the following:

Power module does not provide power to servos. To provide power to servos connect BEC to the servo rail. BEC would also serve as back-up power supply to Navio2.

I’ve got a DYS D800 quad: https://www.unmannedtechshop.co.uk/dys-d800-x4-professional-multi-rotor-package-for-aerial-photography-and-heavy-lift-pnf/

I’ve connected 1 ESC to the Navio2 (channel 1) with all the 3 wires. There is a servo on the channel 7. The issue is, that servo is not doing anything, only if I connect it directly to the X8R receiver’s channel 7.

What am I doing wrong?
Thanks

2

DYS HV40A ESC seems to be OPTO, so it does not have built-in BEC.

3

:tired_face:
Thanks for the answer!
then what do you recommend to me, please ?

4

I am not completely sure about that, you can use a multimeter to check the voltage on the servo rail. Otherwise use a separate BEC, there are plenty of them in any RC shop.

5

After some investigation I can confirm that the ESC has no BEC. So I need to power the servo rail somehow else … Am I guessing wrong all it needs is some power (making sure the voltage is the same - 5v?) from the big red cable coming from the PM?

6

No, please do not power it from the big red cable, it has your battery voltage (12V for 3S li-po). You will need a 5V BEC, they are available almost in any shop.

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7

I’ve got this: High Voltage APM Power Module with 3A UBEC - Unmanned Tech UK FPV Shop
So, just to make it sure I understand … I need another BEC more, just for the servo rail?

8

Yes, because it is right to separate power of sensitive electronics (RPi, Navio) and servos, which can draw high current and cause spikes on the power rails.

2 Likes
9

I see now, thanks a lot.