Acorn suddenly having issue turning on.

[martyscncgarage]

Did you use a Meanwell dual output power supply or is your 24VDC power supply and 5VDC power supply separate?
I think there have been issues using 2 separate power supplies and the 5VDC beating the 24VDC on power up causing the symptoms you describe. Beagle bone's protection features seem to prevent it from starting up. Just an idea. Because of this, I stick to using one power supply with dual outputs when needed just to be sure.
Marty

My Power supplies are separate. When Centroid updated the wiring schematic for the DYN4 drives the showed a separate power supply so that's what I did. I went ahead and ordered a dual one as they are pretty inexpensive. I am also contemplating using the +5v output from the pc power supply that is powering my Acorn PC. Since the pc and the Meanwell power supply share the same ground it should be no problem. But at this point, I'm checking everything to figure out what's exactly going on.

"PC Power Supply Powering my Acorn"? What does this mean?

Yes, one dual voltage power supply, supplies 24VDC to Acorn and 5VDC to your drives.

Marty

[Reedfirst]

Did you use a Meanwell dual output power supply or is your 24VDC power supply and 5VDC power supply separate?
I think there have been issues using 2 separate power supplies and the 5VDC beating the 24VDC on power up causing the symptoms you describe. Beagle bone's protection features seem to prevent it from starting up. Just an idea. Because of this, I stick to using one power supply with dual outputs when needed just to be sure.
Marty

My Power supplies are separate. When Centroid updated the wiring schematic for the DYN4 drives the showed a separate power supply so that's what I did. I went ahead and ordered a dual one as they are pretty inexpensive. I am also contemplating using the +5v output from the pc power supply that is powering my Acorn PC. Since the pc and the Meanwell power supply share the same ground it should be no problem. But at this point, I'm checking everything to figure out what's exactly going on.

"PC Power Supply Powering my Acorn"? What does this mean?

Yes, one dual voltage power supply, supplies 24VDC to Acorn and 5VDC to your drives.

Marty

I think you misunderstood me

PC Power Supply Powering my Acorn PC (PERSONAL COMPUTER) ......I am referring to the ATX power supply providing the power to my motherboard. The Atx power supply has a +5 volt output. (the red wires)

[martyscncgarage]

My Power supplies are separate. When Centroid updated the wiring schematic for the DYN4 drives the showed a separate power supply so that's what I did. I went ahead and ordered a dual one as they are pretty inexpensive. I am also contemplating using the +5v output from the pc power supply that is powering my Acorn PC. Since the pc and the Meanwell power supply share the same ground it should be no problem. But at this point, I'm checking everything to figure out what's exactly going on.

"PC Power Supply Powering my Acorn"? What does this mean?

Yes, one dual voltage power supply, supplies 24VDC to Acorn and 5VDC to your drives.

Marty

I think you misunderstood me

PC Power Supply Powering my Acorn PC (PERSONAL COMPUTER) ......I am referring to the ATX power supply providing the power to my motherboard. The Atx power supply has a +5 volt output. (the red wires)

I wouldn't use the 5VDC from the PC power supply.
Wait for the dual voltage Meanwell. Use it instead.

[andyolney]

Marty - Note that my PS is a dual voltage Meanwell and I am having this trouble.

Andy Olney

[martyscncgarage]

Marty - Note that my PS is a dual voltage Meanwell and I am having this trouble.

Andy Olney

Hi Andy,
Acorn won't power up? How do you get it to power up?
Need information on your configuration. What drives, which schematic did you use. You should post a report.

Marty

[andyolney]

Marty - Sorry, too many threads on this. I am one of the people reporting this issue, I had an acorn fail to turn on and got it running from a hint about 5VDC power in another thread. I disconnected the 5 v from my little Meanwell PS and the acorn started fine and is turning on properly at this time with the 5 VDC connected.

I need the 5 VDC to run my Geckodrive 320x and older 320 servo drives.

Andy

[Gary Campbell]

Andy...
Until a better solution is provided, can you wire the 5vdc thru a relay as shown in the other thread?

[andyolney]

Yes, I am not using that relay and have the schematic.
Andy

[martyscncgarage]

Yes, I am not using that relay and have the schematic.
Andy

Andy, see if Gary's solution fixes your problem.
Marty

[Reedfirst]

OK, I think I may be closing in on the issue.

I am still researching but I believe the Beaglebone isn't powering up because it is seeing voltage on whatever I/O pins are connected to the step/dir pins on Acorn "CAPE" and sending this voltage back to the processor, Thus preventing it from turning on.

Maybe controlling a transistor or similar to turn on the auxillary +5volt power supply after the SYS_5V Pin goes high on the Beaglebone (p9/#8 on the actual beaglegbone) or VDD_3v3 Pin goes high (P9 #4 on the actual beaglebone) will solve this issue.

Taken from the Beagle Bone System Reference Manual

There are several precautions that need to be taken when working with the expansion
headers to prevent damage to the board.
1) Do not apply any voltages to any I/O pins when the board is not powered on.
2) Do not drive any external signals into the I/O pins until after the VDD_3V3B rail is up.
3) Do not apply any voltages that are generated from external sources.
4) If voltages are generated from the VDD_5V signal, those supplies must not become
active until after the VDD_3V3B rail is up.
5) If you are applying signals from other boards into the expansion headers, make sure you
power the board up after you power up the BeagleBone Green or make the connections
after power is applied on both boards.
Powering the processor via its I/O pins can cause damage to the processor

Thoughts anyone?