I think some of my devices have the chassis ground bonded with the negative input terminals, I discovered this because I am running a telecom rectifier shelf designed for -48 on a +48 system because it's floating, but this causes the + output to not be fused, so I practiced arc welding once.
Strange, didn't know the 1100 had dc input, but it looks floating though (per specs -48, 12-57 V) On Sat, Sep 19, 2020 at 12:40 PM <ch...@wbmfg.com> wrote: > I don’t think I have ever seen a true +48 load. > > *From:* Ken Hohhof > *Sent:* Saturday, September 19, 2020 1:29 PM > *To:* 'AnimalFarm Microwave Users Group' > *Subject:* Re: [AFMUG] -48 noob questions (mikrotik) > > > Different situation, but I have several sites with 1100ahx4 powered with > +48, even though Mikrotik says they take -48. I suspect you will find the > same to be true on the CCR. > > > > Connect the – terminal to ground and the + terminal to +48, obviously you > don’t want to apply reverse polarity by trying to connect +48 to the -48 > terminal. > > > > I have some ccr1009 and ccr1036 but they are all AC powered, and I have no > ccr1072, so I can’t answer your exact question. > > > > > > *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *TJ Trout > *Sent:* Saturday, September 19, 2020 2:19 PM > *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> > *Subject:* [AFMUG] -48 noob questions (mikrotik) > > > > So I have a handful of ccr1072's that I want to run on our +48v plant, > mikrotik sells a '-48v telecom' power supply and they insist it's not > compatible with +48v. I ordered one for testing and both +/- input > terminals have no reference to chassis ground. I went ahead and applied > +48v and the power supply fired up (no smoke) and when measuring from > chassis ground to the input terminals I see no difference in potential. > > > > Before I shove this into a $3,000 router I wanted to see what I may be > missing here? > > ------------------------------ > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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