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Author Topic: PDB  (Read 332 times)

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Offline MulderUFO

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PDB
« on: April 19, 2017, 20:11:39 »
Hi all,

I was wondering if anyone else has problems with un reliable pdbs and if anyone can recommend a good one ?

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Offline Revs

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Re: PDB
« Reply #1 on: April 19, 2017, 20:19:24 »
Hi all,

I was wondering if anyone else has problems with un reliable pdbs and if anyone can recommend a good one ?

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Are we talking a basic PDB or one with regs, etc? I'd just get a branded one from a reputable supplier.

Offline Cheredanine

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Re: PDB
« Reply #2 on: April 19, 2017, 20:52:05 »
As above need more detail, frame, supplies, what is it powering

Offline shawdreamer

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Re: PDB
« Reply #3 on: April 20, 2017, 09:40:05 »
I always lean towards Matek if using a pdb, their nothing special but theyve always proven to be rock solid and reliable.

If your using a cc3d fc though consider using one of their new v2.0 fc's with built in  12v & 5v becs, makes a build so much easier and soooo much tidier ~~

http://www.banggood.com/search/cc3d-v2.0.html
550 custom H-copter
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https://www.thingiverse.com/shawdreamer/designs

Offline MulderUFO

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Re: PDB
« Reply #4 on: April 20, 2017, 15:36:38 »
Thanks for your help guys it's much appreciated.
I'm having issues firstly I had an esc burst into flames the other day. It was on a qav x build on 20 amp cicadas. Anyway during flight I was noticing on my vtx that every time i used the throttle i was getting inteferenece through the goggles. As it eveything had worked fine on my other quad i decided its the pdb. So took my props off and during testing with some throttle on and looking through the goggles one of the esc burst into flames. So im at a bit of a loss with it at the mo. Perhaps applied too much power for too long on the 20amp and that caused it to overheat I don't know. So I have a spare matek 3s-6s pdb and some 30 amp dys d shot esc that I'm going to try and hopefully that will work

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Offline MulderUFO

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Re: PDB
« Reply #5 on: April 20, 2017, 15:38:45 »
As above need more detail, frame, supplies, what is it powering
It's a qav x , 4s or 5s lipos being used on a pdb that says 9 to 18v matek and it had 20amp cicada esc

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Offline MulderUFO

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Re: PDB
« Reply #6 on: April 20, 2017, 15:41:05 »
I always lean towards Matek if using a pdb, their nothing special but theyve always proven to be rock solid and reliable.

If your using a cc3d fc though consider using one of their new v2.0 fc's with built in  12v & 5v becs, makes a build so much easier and soooo much tidier ~~

http://www.banggood.com/search/cc3d-v2.0.html
Yes thanks I have only used pdbs from matek and one from armattan . This is is the only one i think I'm having problems with on this build. My other builds have been fine so was just trying to see if anyone else has had issues with pdbs and could recommend any .
Thanks for your reply mate

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Offline Cheredanine

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Re: PDB
« Reply #7 on: April 20, 2017, 15:43:36 »
4s =16.8v, 5s = 21v

That pdb is not 5s capable, you are lucky it hasn't burst into flame and taken the fc with it.
The 20a escs probably blew due to too much current though, the motors try and spin at a certain rate per volt, so 5s tries to make them spin harder, that draws more amps.

What motor/prop/esc specifically were you using?

(My concern is it is likely that although you are likely to blow the pdb that's not causing your esc to blow or lines in fpv, new pdb for qav is pretty easy, what flight controller are you using?)

Offline MulderUFO

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Re: PDB
« Reply #8 on: April 20, 2017, 16:11:23 »
Yes I was only using a 4s when it burst into flames. Thanks for the info with that. I take it i need to consider what voltage the pdbs can handle as well before installation.
It's a naze32 afroflight . Runcam swift 2 and tbs unify hv. Both the camera and the vtx have been working beautifully on my other quad. The lines on the screen aren't your usual break up or anything like that and it only happens when you apply a decent amount of throttle so my theory was there some level of interference bleeding out voltage intermittently over to the vtx.

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Offline MulderUFO

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Re: PDB
« Reply #9 on: April 20, 2017, 16:12:44 »
Are we talking a basic PDB or one with regs, etc? I'd just get a branded one from a reputable supplier.
It's a matek 9v to 18v

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Offline MulderUFO

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Re: PDB
« Reply #10 on: April 20, 2017, 16:14:36 »
Here's my quad anyway initially it was working amazingly. 2207 2600kv gold Cobras it's really punchy

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Offline Cheredanine

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Re: PDB
« Reply #11 on: April 20, 2017, 17:06:30 »
So you didn't cover props but assuming any sort of 5 inch, that is a bad combo

Who chose components? The high kv cobras spinning decent 5 inch props will draw well over 20amps on 4s, never mind 5s. They are under specified.

I would look at 30amp really. And if you are gonna run 5s the escs will need to be 5s capable.

Your vtx/cam combo is an excellent one but it really needs a 12v supply
The naze needs a 5v supply (again a weak choice given the rest you your kit, it just DNA run the run loop times to push the motor changes quick enough.


Anyway
Pdb:
http://www.hobbyrc.co.uk/lumenier-4power-plus-pdb-5v10v-reg-184a-curr
Power the vtx and cam off the 10v reg.

Honestly I would ditch the naze, get a decent f3.

Your lines on the vtx are probably due to slight oscillations at high throttle which the fc reacts to by speeding in and breaking motors, this produces electrical jitter. Thinks that will help:

Soft mount the fc
Use a 1000uf low esc 35v cap across the xt60 solder pads on the pdb
Faster protocols, better tune will help too

I would suggest using something like spedix es30 blheli_s escs, but you may want to wait as wraith32 blheli_32 30a escs will be out mid may

And as I say, a decent f3 flight controller



Offline Saleem

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Re: PDB
« Reply #12 on: April 20, 2017, 18:44:09 »
It's a matek 9v to 18v

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Your esc are using what i would describe as wrong neg point mate!

Offline MulderUFO

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Re: PDB
« Reply #13 on: April 23, 2017, 17:49:08 »


So you didn't cover props but assuming any sort of 5 inch, that is a bad combo

Who chose components? The high kv cobras spinning decent 5 inch props will draw well over 20amps on 4s, never mind 5s. They are under specified.

I would look at 30amp really. And if you are gonna run 5s the escs will need to be 5s capable.

Your vtx/cam combo is an excellent one but it really needs a 12v supply
The naze needs a 5v supply (again a weak choice given the rest you your kit, it just DNA run the run loop times to push the motor changes quick enough.


Anyway
Pdb:
http://www.hobbyrc.co.uk/lumenier-4power-plus-pdb-5v10v-reg-184a-curr
Power the vtx and cam off the 10v reg.

Honestly I would ditch the naze, get a decent f3.

Your lines on the vtx are probably due to slight oscillations at high throttle which the fc reacts to by speeding in and breaking motors, this produces electrical jitter. Thinks that will help:

Soft mount the fc
Use a 1000uf low esc 35v cap across the xt60 solder pads on the pdb
Faster protocols, better tune will help too

I would suggest using something like spedix es30 blheli_s escs, but you may want to wait as wraith32 blheli_32 30a escs will be out mid may

And as I say, a decent f3 flight controller

Thanks for your in depth reply cheradanine ,

I have some dys d shot 30 amp 3-6s should be ok. And a pdb that claims yo be up to 6 s.
After your comments regarding the naze I'm starting to think that's what could be causing it the video "lines" so I'll probably either swap for a kiss fc or sp racing. As for the 1000uf across the solder pads  what is That exactly for? it looks like a capacitor is that to absorb voltage or something?



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Offline Cheredanine

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Re: PDB
« Reply #14 on: April 23, 2017, 18:12:59 »
Basically yes, it will smooth out voltage spikes, specifically look for a 1000uf low esr 35 capacitor, e.g.:
https://www.amazon.co.uk/1000uf-105c-EEUFC1V102-Panasonic-x4pcs/dp/B00LX6PHYY

Do think voltage noise/spike from esc will be causing the lines, but upgrading naze to something better (no experience with kiss, would recomend lux v2 over spr) will improve flight performance