Wow, I had not gotten that far with bench testing to observe that. My tower is grounded properly so I would have found out the hard way when +48 power managed to find its way back into the equipment cabinet through the tower grounding system! I can understand now why you need the isolated DC converter. With one rated at 200 watts, I think you need 1 RSD-200C for each BreezeCompact?
Matt Lauer Solvaris, Inc. 586.453.0440 p 248.495.3977 c 586.453.0805 f [email protected] <mailto:[email protected]> www.solvaris.com <http://www.solvaris.com/> > On Dec 21, 2016, at 2:01 PM, Adam Moffett <[email protected]> wrote: > > Matt, > > We're actually running without the power supply grounded at most sites, but > it doesn't matter for the equipment smoking issue because the Compact has DC+ > connected to it's chassis ground. You can verify this by measuring for > voltage or resistance between the negative terminal on your power supply and > the ground lug or mounting bracked on your Compact. If you have a +48 device > on the tower which also has a chassis ground connected to DC then it won't > matter whether or not you have a ground at the bottom.....you'll have a short > through the tower and either blow a fuse or smoke something. > > What should be safe in that mixed DC environment, in my opinion, is an > isolated 48v to 48v converter such as a Meanwell RSD-200C-48 or equivalent. > You put it between your rectifier and the Compact power cable. > > Good luck out there, > Adam > > > ------ Original Message ------ > From: "Matt Lauer" <[email protected] <mailto:[email protected]>> > To: [email protected] <mailto:[email protected]> > Sent: 12/21/2016 8:54:09 AM > Subject: [Telrad] Neg 48 on BreezeCompact 1000 > >> I have a BreezeCompact 1000 powered up on the bench. I read the installation >> manual and I do see it is advised to connect “+ Output to Site Ground” per >> page 24 of the manual. I have mixed equipment in our tower cabinet so we >> have a floating ground - neither a negative or a positive is bonded to the >> cabinet/chassis ground. I will burn up other equipment if I positively >> ground the + output from our rectifier. Is anyone else running Telrad in >> production with a floating ground? >> >> Matt Lauer >> Solvaris, Inc. >> >> 586.453.0440 p >> 248.495.3977 c >> 586.453.0805 f >> >> [email protected] <mailto:[email protected]> >> www.solvaris.com <http://www.solvaris.com/> > _______________________________________________ > Telrad mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/telrad
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