24V PSU and a PowerBank?
-
I guess I was trying to determine if the powerbank would keep the Duet alive long enough for the resurrect process to complete, if the mains power failed, and that keeping it plugged in to the USB connector on the Duet board was a good idea or not.
I saw this as an alternative to using a capacitor across the VIN, and possibly needing a diode/resistor combination, too.
-
@nightowl999 I was kind of forgetting that your spindle would be running off 240V so my DC UPS wouldn't be much use to you.
-
Hmm, I think the answer to my powerbank being used is "no", because it has separate charging and powering ports.
What I need is a bi-directional powerbank, which charges and supplies from the same connector. There aren't many around, that's for sure!
-
@nightowl999 said in 24V PSU and a PowerBank?:
What I need is a bi-directional powerbank, which charges and supplies from the same connector.
The opposite is true. You load it on one port (with an USB adapter from mains power) and draw 5V power for the Duet from the other. The question is: does the power bank permit this kind of usage? That depends on how a given device is internally wired.
[Edit] Note that you have to change the arrangement for several voltages on your Duet and some jumpers, too. As a starting point, I gave you some links on the other thread. Without this knowledge, you risk your board.
-
@infiniteloop, @dc42
As suggested I've taken a look at the documentation and also tested the PowerBank (PB) and it seems to work in my favour.I tested it by plugging a USB charger into the wall, connecting that to the PB, and then plugged a Kindle into the PB. The charge light shows on the PB and it's charging the Kindle. When I switch off the mains, the PB continues to charge the Kindle. All good so far!
I see the MB6HC can be supplied by a seperate, external 5V power supply by removing the Internal 5V EN jumper and providing a 5V supply to the EXT 5V connector. This seems quite straightforward.
However, this isn't just about keeping the 5V long enough to store enough information to resurrect the machine from a power failure. The PB may not provide a stable/adequate 5V supply and, I assume, will also need to supply the 5V required to any other 'peripheral', like the four proximity switches.
So, although it seems to be a good plan in theory, what are the likely implications of doing it this way, please?
Thank you
-
@nightowl999 said in 24V PSU and a PowerBank?:
The PB may not provide a stable/adequate 5V supply and, I assume, will also need to supply the 5V required to any other 'peripheral', like the four proximity switches.
The PB will supply 5V. The question is: how much of that? To run board and peripherals, the USB port feeding the Duet must deliver something around 2A - that's considerable more than specified for USB 2, but is no problem for most of the larger PBs I know. In turn, the USB charger must also be capable of feeding the PB with more than 2A - to be sure, consult the respective manuals/data sheets of the devices.
-
@infiniteloop
Good point. The specification of the PB is quite low: 5V 1A out, 5V 0.75A in, so deffo a more powerfule one will be needed!Thanks again, @infiniteloop
-
@nightowl999 said in 24V PSU and a PowerBank?:
A more powerful one will be needed!
Have a look at those with USB-C connectors: these usually allow for more amps per port. Of course, you should try them the same way you did with the PB you own: regardless of input power, the out-port must deliver.
-
@infiniteloop
I'm looking at this one! -
@nightowl999 said in 24V PSU and a PowerBank?:
I'm looking at this one!
Looks like it is coming without a charger?
-
@infiniteloop Yes, but I have a few of those!
