What can happen if the two PSU voltages are too close, is there some risk of hardware damage? The normally higher voltage could become lower if the PSU is failing soon (old capacitors etc.), the hardware should be prepared for that. If there were just two Schottky diodes there wouldn’t be any issue (just load sharing, harmless) if the delta is too small.
Also, what is the safe voltage range? CCR1016 quick guide says 18-28V, block diagram says 12-24V, I’d like to power from 10-14V (power supply with 12V lead acid battery backup) if possible, is that safe? Might be a good idea to accept standard -48V telecom power (36-60V) in future products though.
Can I ask what would happen if built in power supply goes faulty?
For example if the output is shorted due to some component malfunction could it in turn short out the power rails and if this occurs then there is no point in having a second power supply attached unless ( I haven’t seen the block diagram) but if it was using steering diodes then they would isolate the power supply fault from the board and the second power supply would operate but this must also have steering diodes which also protects against polarity reversal.
As I stated above if the PSU with the lower voltage fails, you’ll not notice it until the other PSU fails too. So the whole idea is just senseless anyway. A device like the CCR needs a proper dual-PSU setup incl. SNMP Monitoring and LED indicator on the front panel.
Depending on power supply fault, there is a high probability that if one power supply goes faulty it could pull down the second as well unless there is isolation in place to prevent this occurring.
That will not happen. Maybe I am missing something, if you have specific example, I can re-confirm with the engineers, but I am quite sure there is protection against that.
A device like the CCR needs a proper dual-PSU setup incl. SNMP Monitoring and LED indicator on the front panel.
I agree! We will work on dual-PSU devices in the future. The above is just a workaround.
@Normis
Example - if the positive DC output due a component going faulty - shorted to earth - first there would be a very large current draw which in turn would blow any protection fuses and this will cut the AC supply - BUT the fault remains on the output of this power supply where the positive rail remains shorted to earth - the second power supply positive DC rail will also be effected by this and in turn it would also blow a fuse - then you have two dead power supplies one due to component failure and second due to excessive current draw - unless there in protection in place to isolate each power supply from each other so a fault in one doesn’t cause a domino effect to the other?
and port poe does not work? not feed as an alternative source of energy?
tested and it will not turn the door poe.
is written on port 12 which is poe. but not working.
We would really like to be able to use on some of our core sites since the RB110AHx2 are beginning to creak but without either putting in mains UPS (too inefficient) or voiding warranty (hard to sell to management) I don’t see how we can do so.
You have a board, you have a case and you’d definitely have a market, all it will take is some screws and a new label (or even some of the pre-production labels if there are any left)
Can we buy a CCR1016-12G-BU and an empty case even? Seems rather extreme to gut a working router just to get a case!
As regards the RB110AHx2 I simply bypassed the internal power supply and connected to DC battery bank which powers all dc (24V) equipment on site, onto the battery bank is a float charger attached to keep batteries charged. A simple solution for me.
Did someone upgrade the CCR 1016/36 to a dual power machine? How could I do it? There is not enough space for a second PSU inside. Do you buy two new smaller PSU and make a second hole for the power cable tail in the chassis? Or do you take an external PSU and wire it to the internal connector?
