Don’t get mad, but just making sure, you didn’t by chance get the second diode 
in backwards?


From: Af [] On Behalf Of George Skorup
Sent: Saturday, October 15, 2016 8:51 PM
Subject: Re: [AFMUG] dual psu with diode, ccr1036 wierdness


The CCR1016-12S-1S+ and CCR1072 are the only two that have dual supplies built 
in into the chassis. Most Routerboards support redundant power via jack and 
POE. The CCR1036 obviously doesn't support POE input. I thought it has two 
internal power connectors, but only one is used? Maybe I'm thinking of 
something else.

On 10/15/2016 8:23 PM, Chuck McCown wrote:

I know  you know this.  Diode voltage drop depends on current.  If the router 
has times when it is drawing significantly less current, then the voltage drop 
will be less and vice versa.  I know everyone cites .6 volts for a PN silicon 
junction but it is more like double  that on many power rectifiers.  A common 
1N4004 has a 1 volt drop at 1 amp.  But only about .2 volts down in the 
microamp region.  


From: "TJ Trout"  <> <>
To: <> 
Sent: Saturday, October 15, 2016 6:43:04 PM
Subject: [AFMUG] dual psu with diode, ccr1036 wierdness

to increase reliability on my new ccr1036 router, I decided to add a second 24v 
psu and isolate the two with rectifier diodes. The factory PSU puts out about 
24v, after the diode drop it's about 23 and change, I installed a second psu 
and adjusted the output to 22v or about 21 and change after the diode.

I installed the router and started monitoring the reported voltage by SNMP 
logging, I noticed it started out at 23v and then has been slowly jumping down 
and back up to 22v any idea why it wouldn't just keep taking power from the 
source with the highest voltage?


Is this going to be a problem? I was hoping to monitor for main psu failure by 
sending an alert below 23v which would tell me if the main PSU failed but for 
some reason this isn't working as planned...



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