The pdu design will be ground specific. The solid state relay design will be isolated so it doesn't matter. On Jul 15, 2016 7:47 AM, "Adam Moffett" <[email protected]> wrote:
> Will the -48 PDU be strictly positive ground, or is it floating? > > I.E.: Could I stock the one PDU for either type of loads, or would I have > to have separate +V and -V PDU's? > > > > ------ Original Message ------ > From: "Forrest Christian (List Account)" <[email protected]> > To: "af" <[email protected]> > Sent: 7/12/2016 5:08:55 AM > Subject: Re: [AFMUG] -48 PDU > > > I have around 10 or so new/revised products which will be shipping over > the next few months. (4 of the ones in our backlog have just started > shipping the last couple of weeks, and others are coming off the pipeline > shortly). > > At least two of the coming products are intended to fix the lack of -48VDC > support. One of which is the addition of a 5PDU for -48VDC (which is > able to be powered from the -48VDC power source so it doesn't need a base > unit). The other one I can think of right now is there's a 6 channel > solid state relay coming as well. Both will switch -48VDC at at least 3A. > The PDU has a maximum-all-channels limit of I think 8A. The SSR module > will not have this limit. > > I can build a -48VDC PDU on the existing board: To date I have not had > any customers ask me to do so once I have explained that this module would > have to be connected to a base unit, and rebooting or losing the power to > the base unit would result in all of the -48VDC loads attached to the PDU > being shut off during the power loss or reboot. This is also the reason > it is not currently on the website as an option. > > On Mon, Jul 11, 2016 at 8:11 PM, George Skorup <[email protected]> wrote: > >> I asked Forrest about doing a -48 version of the 5ch PDU. He said it >> would need some tweaking since the PDU itself is powered by the main input, >> kinda like a SyncInjector. >> >> Depending on your current, you could use a regular 4-relay exp. module to >> switch the hot wire for each device. Should be able to handle about 1A @ >> 48VDC. Next question is, would a -48 version of the PDU support say 1.5A >> per port? I know you can set the per port limit to 3000mA, but I'm not sure >> if it'd be capable of that between 44 and 58VDC. I want to say I remember >> him saying 1.5A should be OK. >> >> I have some Trango licensed radios that I'd like to get on remote power >> control, but so far there's nothing to handle them. Nothing that I like >> anyway. And the problem there is the damn 75-80 watts of power they use. >> >> On 7/11/2016 7:30 PM, Adam Moffett wrote: >> >> Is there a relatively cheap device that can take 48v in and switch a >> handful of -48vdc loads on and off? >> >> I'm thinking like $100-200 kind of cheap. Small and DIN mount would be >> best. >> >> The packetflux PDU has a negative ground, so that's already out. >> >> >> >> > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com/ > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > >
