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PegasusPower Advanced connections question/cable mgmt

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#1 Hank Scorpio

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Posted 17 May 2021 - 12:59 PM

Hello All - In an effort to speedup my setup/teardown process and also reduce variables when troubleshooting problems, I've decided to get serious about cable management.

 

The gear:

meade 130mm apo triplet, eq6-r pro, asi294mm, asi290mm-mini, ZWO OAG, ZWO 7x36 filterwheel, ZWO 5v autofocuser (new model).  I run astroberry on a rpi4 w/8GB and connect all this through a powered USB hub.  Right now this is working. I have four cables from the OTA to the mount/stand: 

1: rpi4 to mount (usb3 cable)

2,3,4:  5v for the rpi and 12v for camera cooler and powered USB hub

 

Most cables are too long and are wound up with velcro.  It works - until something get bumped or moved.  I need to get a dew-strap and don't want to add to this rat's nest.

 

My desired end state is to run everything into a PegasusPower Advanced (PPA) and control it through that.  My question comes down to the power from the various ports.  I would like to run the following:

 

USB on the PPA:

port 1 (special USB3 powered port) - ZWO autofocuer 5v - new model gets power from USB, no external 12v power)

port 2 - ASI294mm with filterwheel (daisy-chained through camera)

port 3 - eq6-r mount 

port 4 - ASI290mm-mini guidecam

 

Power ports on PPA:

port 1 - eq6-r (special cable to interface with mount from Pegasus) @12v

port 2 - cooling power for ASI294mm @12v

port 3 - power for rpi4 (2.1mm barrel to usbC connector plugged into rpi4) @5v

 

My main question is about powering of the rpi4 and the autofocuser.  Does anyone know if this new ZWO autofocuser that pulls power from USB work in port1 of the PPA?  Additionally, is it possible (advisable) to run the rpi4 from the power port with a cable such as this: https://www.amazon.c...020651&sr=8-10 

 

If so, sourcing appropriate length cables and mounting hardware will be the next order of business.

 

Any help/experience here would be greatly appreciated - thanks!



#2 Kevin Ross

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Posted 17 May 2021 - 01:20 PM

Do NOT plug the Raspberry Pi into power port 3, that's a 12V output, and the Pi only wants 5V. You could plug it into the Adj port, as long as you adjusted the voltage to 5V first.

 

Also, Pegasus says that USB port 1 is ONLY compatible with USB3 devices, not USB2. I'd bet the ZWO EAF is USB2 (why would it be USB3, it isn't transferring much data).

 

If this were my setup, I'd probably plug the Pi into USB port 1 with a USB A-to-C cable, the cameras and EAF into the remaining USB ports, and probably plug the EQ6-R Pro USB cable into the Pi, since the mount doesn't draw any power over the USB cable, it's only for serial communication. I'm assuming you're mounting the Pi next to the PPA, which would make this feasible. If you're mounting the Pi somewhere else not next to the PPA, this becomes more of an issue.


Edited by Kevin Ross, 17 May 2021 - 01:25 PM.

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#3 Hank Scorpio

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Posted 17 May 2021 - 01:33 PM

Thanks for the fast response Kevin.  I was planning on running the rpi4 via power port at 5v (internally adjusted from PPA interface) but I think your approach makes more sense...and yes I am stacking the rpi and PPA together with some reasonably secured mount.

 

Initially I was troubleshooting rpi4 USB issues and I came to the conclusion that everything was more stable running through the powered USB hub.  I would bet you are correct that splitting the mount serial control to the rpi4's usb would be fine.

 

thank you for the suggestion.



#4 jonnybravo0311

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Posted 17 May 2021 - 01:35 PM

I agree with Kevin's assessment. The EAF won't work on USB port 1 of the PPBA. The new EAF clearly shows it's a USB 2.0 out. Plug it into the USB hub on the ASI294MM Pro. Plug the 7x36 into the other port on the camera. Use USB port 1 with an A-to-C cable to power the rPi. Use USB ports 2, 3 and 4 on the PPBA for the remainder of your USB needs. For power, mount in 12V port 1, ASI294 cooling into 12V port 2.



#5 Kevin Ross

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Posted 17 May 2021 - 01:57 PM

Ah, I forgot about the camera having 2 USB ports, good call!



#6 Hank Scorpio

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Posted 17 May 2021 - 03:39 PM

Thanks JonnyBravo0311 - I was under the impression that the power draw from the usb-powered EAF might not get enough power from the camera's usb hub?  I was not aware that was an active or powered port on the camera?  I suppose it does have the 12v power along with the usb3.0 spec, perhaps it is enough.

 

So EAF and EFW go on the ASI294mm hub because they are used in serially vs. parallel.  Then the ASI290mm-mini guide goes to the PPA because that runs in parallel with ASI294mm.  Makes sense on paper...I can try this config with my current gear...though clouds are dictating otherwise.

 

Thanks again guys - this really helps me sort through this process.



#7 Kevin Ross

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Posted 17 May 2021 - 03:53 PM

On my camera (ASI1600MM Pro) the hub is powered through the 12V connection. If you don't plug in the 12V, the USB hub is unpowered. I assume your camera is the same.


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