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RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Wed Jan 18, 2017 11:16 am
by cutedrummerboy
can any one tell me that how to achieve RB2011 Redundant Power Supply with Internal PSU and external PSU. as per a old post of normis in this forum, all new RB can be powered via dc barrel connector power input and POE input simultaneously. i recently install a 19.2 volt laptop adeptor inside my 2011. now i want to know, can i power my 2011uias-RM with that psu and as well as external factory supplied psu also??

here is the mod pic
16129295_1231153613633293_937494579_o.jpg

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Wed Jan 18, 2017 2:20 pm
by futsker
I think, it depend of schematic of your laptop's PSU.
Better to make power switch, wich will manually (automatic) disconnect 19v wire of "laptop" PSU from motherboard, while connected external "factory" PSU.

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Wed Jan 18, 2017 8:14 pm
by cutedrummerboy
but in a old post normis wrote that we can use backside barrel connector and poe input at same time. routerboard use that input which have higher voltage. then why cant we use internal power port and external barrel connector simultaneously. i just want the explanation.

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 9:31 am
by futsker
why cant we use internal power port and external barrel connector simultaneously. i just want the explanation.
it depends of schematic of your internal and external PSUs. If you apply external power source to output of internal PSU (or internal power source to output of external PSU), it can damage one of these, even if it not powered on with 220v
You need smart circuit to switch between 2 PSU, or mechanical switch to manually select (manually switching) internal or external PSU

It looks like PSU for 110v or 220v. It can be with manual switch or automatically detects input voltage

Manual switching
Image

Automatic switching
Image

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 9:41 am
by cutedrummerboy
futsker, actually I understand what you want to tell me but as per the old post of normis all modern rb have this automatic switching functionality in built on external dc barrel connector and poe input. now I want to know is the same thing we can apply on internal power port and external barrel connector??

p.s. I already moded internal power with a laptop psu, now I want to apply battery power at dc barrel connector. that's it.

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 10:10 am
by futsker
all modern rb have this automatic switching functionality in built on external dc barrel connector and poe input. now I want to know is the same thing we can apply on internal power port and external barrel connector??
i think circuit of PoE input and circuit of power supply at motherboard are not the same. If PoE input has automatic switching between PoEI and external or internal PSU, that doesn't mean automatic switching between external and internal PSU

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 10:16 am
by expert

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 10:22 am
by futsker
Look at the picture:

Image

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Thu Jan 19, 2017 10:38 am
by futsker
You can check voltages at internal power connector when connected external PSU and vice versa - check voltage at external power connector when when connected internal PSU and make conclusion.

Re: RB2011uias-RM Redundant Power Supply with Internal PSU and external PSU

Posted: Fri Jan 20, 2017 8:32 am
by karlisi
It is possible to use two power sources, though it is not supported by manufacturer, of course. Connect both power sources trough diodes like 1N4002 - 1N4007. Anodes to power sources, cathodes connected together and to external power input of RB.

Disclaimer: I am not responsible if You damage something as result of this! :shock: