#ESC doesnt spin Motors

40 messages · Page 1 of 1 (latest)

dim sage
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So i started my first drone build and the problem is that the esc is not spinning up my motors.

So I connect the ESC to the battery, there is no beep, no click, no signal, Nothing. It does measure ESC Ground to TX at 3.3V then but apart from that, nothing. I have installed Betaflight on my FC and wen into the Motors Tab to spin my Motors up. I have Dshot600 selected. the M1, M2, etc. Voltage to groud varies just between 0.25V and 0.46V depending on throttle. When I go to am32.ca and try to read it just tells me ACK_D_GENERAL_ERROR, similarly when I type in status in the Betaflught Console it doesnt show any esc, it does show the 24.4V and the battery level. All the 8 cables of the FC to the ESC are connected correctly.
The esc is new, i orderd it 2 months ago.

I have made these readings:

ESC Ground to VBat is 24.4V

ESC Ground to CR is 0.1V
ESC Ground to TX is 3.3V
ESC Ground to M1 is 0.25V

0.46V FC Ground to M1 MAX THROTTLE, 0.25V FC Ground to M1 MIN THROTTLE
0.46V ESC Ground to M1 MAX THROTTLE, 0.25V ESC Ground to M1 MIN THROTTLE,

FC Ground to ESC Ground: 0.1Ohm, 0V with battery
ESC CR to FC Current sensor input: 0.4Ohm resistance.
ESC CR to Ground is like 1Ohm on the FC and on the ESC

Here are the FC and Esc I have:
FC: Kakute F4 V2 (F405): https://www.unmannedtech.co.uk/uploads/6/7/0/2/6702064/holybro_kakute_f4_v2_manual.pdf
https://ardupilot.org/copter/docs/common-holybro-kakutef4.html

ESC: SEQURE Blueson A2 8S 70A AM32:
https://sequremall.com/products/sq-blueson-a2-esc-am32-blheli_32-128khz-4in1-esc-forfpv?variant=44706874196156

Thank you in Advance for anyone helping, Im really confused by all this and very lost.

SEQURE
SEQURE Blueson A2 6S 8S 70A ESC with AM32 or BLHeli_32 Firmware 128...

Product Description: (1) High-quality ultra-high copper thickness PCB ensures the current carrying capacity while improving heat dissipation. Equipped with top-level MOSFET, it enhances flight performance and makes you enjoy the fun of flying in the air.(2) Equipped with a high-speed 32-bit processor, it supports full-

runic summit
dim sage
runic summit
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Apart from the highly dangerous soldering... are you sure the heatsinks aren't shorting out the fets and/or the motor output connections?

dim sage
runic summit
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Just to make sure... get good quality photos of both sides of the board

dim sage
runic summit
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I see a couple small balls of solder, and the MOSFETs close to the motor look pretty cooked

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It's likely that something shorted out when it was powered on

dim sage
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they look the same as the other ones on person there is just some flux on those so in the picture they look darker i think they are fine

runic summit
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to be completely honest, the soldering is not functional

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like even if the board itself was fine, the solder joints are likely to cause issues anyway

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I would strongly recommend to get proper equipment and use a practice board to improve before tackling something like this

dim sage
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So I cleaned up the board it looks fine to me I guess the soldering was crooked but it wasnt shorting I checked that and so maybe it was the heatsinks that shorted something although I dont see any visible damage on the board. Guess I have to try again with a different board. Its just this stupid 10AWG wire it doesnt even stay together when you solder it it goes apart even if you twist it and then its huge. My 80w iron should be fine for that though. Well looks like the board is just broken and it wasnt a software thing. Thanks for the help @runic summit

20251017_211542.jpg 20251017_211532.jpg
runic summit
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by the look of the pads, the wires were barely holding on, if at all

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you need to tin the pads and wires properly before soldering them together

dim sage
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yeah thanks but the voltage itself was also wrong its not supposed to be .25V to .46V. its supposed to be like 3V. And the esc should have atleast made a beep or anything like that.

runic summit
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It won't give any beeps if the ESC channel is dead

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And the control channels are digital, with just the current output being an analog signal. Getting voltage readings from the other pins won't give anything useful

dim sage
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so your saying its fine? The motors were def connected though I checked there was like no resistance from the cable end to the underside of the pad. So if the motor was connected it should have made a beep right? @runic summit

runic summit
dim sage
runic summit
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what soldering iron and solder are you using?

dim sage
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I am using an 80W atten 2090D. I use some rosin core expensive solder I dont know the details of that anymore but I will practice on the board the video you sent is good

runic summit
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okay, what tip and temperature were you using?

dim sage
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I was using the max temperature since otherwise the thick solder would not really melt which is 480 celsius. I only applied heat for like 6s max. I was using a thick tip this one its 4mm diameter

rn_image_picker_lib_temp_f8e08976-0950-4edd-afad-364404569e53.jpg
runic summit
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It should not need 480c to barely melt the solder, especially with a tip like that

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something is wrong, either with the iron or the solder

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can you take some photos of the solder if there's any useful label?

dim sage
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Yeah that was just for the really fat stuff

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Yes wait

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I had to use the 480 for the 10awg wire

runic summit
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doesn't say it's leaded, so it probably isn't

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get some nice leaded solder, it will make your life a lot easier. If you can't find specific alloys, you should be able to get TBS Solder for a little extra

dim sage
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TBS is the good one?

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Ok thanks i will get that

runic summit