Greatings.
Have one 2004-PC, and i can’t find any information about powering.
We don’t use such form factor devices, we have tons of 2116 and 2004-RM, where is 2 AC with power failover. This one (2004-PC) was bought by a mistake of our managers, and i need to make smth with it )
I’m curious if i can plug 2 PS at the same time in both dc input (DC jack, 2-pin terminal) and if there some kind of power failover. Don’t wonna make test on a 500$ device )
Thank all in advance.
All Mikrotik devices with multiple power inputs accept voltage on all of them, the one that “wins” and powers the board is the one with the higher voltage.
When the one in use fails/is disconnected, the next one will be used.
http://forum.mikrotik.com/t/if-poe-in-dc-power-supply-connected-redundant-power/91996/1
There is no reason to presume that this model works differently.
As Normis posted in the above, it may be better if the voltage levels on both are not exactly the same (I presume to avoid “flapping” in case of momentary fluctuations of voltage).
If you have both power supply at the same theoretical voltage, maybe it is a good idea to use a couple diodes in series, each one should lower the voltage about 0.7V, the 1.4V difference could be enough, see:
http://forum.mikrotik.com/t/warning-ccr-and-two-power-supplies/74759/1
It is not your case, but for devices that also use PoE, the failover to PoE won’t be automatic/instant if the power comes from active PoE, because of the time needed for negotiationg along the 802.3af/at protocol, see:
http://forum.mikrotik.com/t/rb5009ug-s-in-dual-power-power/159513/1
If i get it right - there is discussions about poe in + dc, my case is dc + dc.
About voltage difference - got it, thx.
yes and no.
This is Poe+dc:
http://forum.mikrotik.com/t/rb5009ug-s-in-dual-power-power/159513/1
and as said doesn’t apply to your case, but if you read it attentively this post by mkx, it is “general”:
http://forum.mikrotik.com/t/rb5009ug-s-in-dual-power-power/159513/1
This is both Poe+dc and dc+dc:
http://forum.mikrotik.com/t/if-poe-in-dc-power-supply-connected-redundant-power/91996/1
This is dc+dc (though the original post is a “hack”, the 2 pin power works just the same):
http://forum.mikrotik.com/t/warning-ccr-and-two-power-supplies/74759/1
If you prefer dc+dc (jack and 2 pin connector) represent already “multiple power sources” and the added PoE (which will work just like the other two if passive and “forced on”) is still the same but if active/802.3af/at is a special case and behaves differently.