Re: [AFMUG] Negative Voltages...

2017-11-09 Thread George Skorup 
I've seen licensed PTP gear rated -36 to -72. I think that's a little 
bit generous. Probably -40 to -60 would be OK. But maybe -65 or so for 
very aggressive rectifiers wouldn't be a bad idea either.


On 11/9/2017 2:03 PM, Robert Andrews wrote:
33.6 top equalize for 24 v   62.4 top equalize for 48 v.   I would 
have expected the bottom to be more like 22v...


On 11/09/2017 11:37 AM, Adam Moffett wrote:

I'm looking at a 48V Meanwell RSD with an input range of 33.6 - 62.4V.
Seems strangely specific.

-- Original Message --
From: "Robert Andrews" <i...@avantwireless.com>
To: af@afmug.com
Sent: 11/9/2017 2:32:44 PM
Subject: Re: [AFMUG] Negative Voltages...


-62 for Battery conditioning ( equalize )... with surges...

On 11/09/2017 11:20 AM, Carl Peterson wrote:
It should support something like -42 to -60.  The topside is 
normally something like -56 but -60 gives a little margin.


On Thu, Nov 9, 2017 at 2:09 PM, Adam Moffett <dmmoff...@gmail.com 
<mailto:dmmoff...@gmail.com>> wrote:


   __
   I don't recall ever seeing anything other than -48. Personally if
   you accept the range from "dead battery" to "fast charging 
battery",

   and do something non-destructive when voltage is out of range, then
   I'll be happy as a clam.


   -- Original Message --
   From: "Forrest Christian (List Account)" <li...@packetflux.com
   <mailto:li...@packetflux.com>>
   To: "af" <af@afmug.com <mailto:af@afmug.com>>
   Sent: 11/9/2017 2:04:48 PM
   Subject: [AFMUG] Negative Voltages...


   I'm working on some support for -48VDC in various products.

   I'm wondering if anyone has encountered a different negative
   voltage than -48VDC in the wild, say -24VDC or similar.    The
   main reason why I ask is that it is looking like I'm not going to
   be able to support as wide of range of voltages on the negative
   side as I do for the positive side (12-60VDC), and wondering if I
   really only need to support something along the lines of 32-60VDC
   on the negative side.

   -- *Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
   Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT
   59602
<https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602=gmail=g> 


forre...@imach.com <mailto:forre...@imach.com> |
http://www.packetflux.com <http://www.packetflux.com/>
   <http://www.linkedin.com/in/fwchristian>
   <http://facebook.com/packetflux> <http://twitter.com/@packetflux>






--
Carl Peterson

*PORT NETWORKS*

401 E Pratt St, Ste 2553

Baltimore, MD 21202

(410) 637-3707

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Robert Andrews 
33.6 top equalize for 24 v   62.4 top equalize for 48 v.   I would have 
expected the bottom to be more like 22v...


On 11/09/2017 11:37 AM, Adam Moffett wrote:

I'm looking at a 48V Meanwell RSD with an input range of 33.6 - 62.4V.
Seems strangely specific.

-- Original Message --
From: "Robert Andrews" <i...@avantwireless.com>
To: af@afmug.com
Sent: 11/9/2017 2:32:44 PM
Subject: Re: [AFMUG] Negative Voltages...


-62 for Battery conditioning ( equalize )... with surges...

On 11/09/2017 11:20 AM, Carl Peterson wrote:
It should support something like -42 to -60.  The topside is normally 
something like -56 but -60 gives a little margin.


On Thu, Nov 9, 2017 at 2:09 PM, Adam Moffett <dmmoff...@gmail.com 
<mailto:dmmoff...@gmail.com>> wrote:


   __
   I don't recall ever seeing anything other than -48.  Personally if
   you accept the range from "dead battery" to "fast charging battery",
   and do something non-destructive when voltage is out of range, then
   I'll be happy as a clam.


   -- Original Message --
   From: "Forrest Christian (List Account)" <li...@packetflux.com
   <mailto:li...@packetflux.com>>
   To: "af" <af@afmug.com <mailto:af@afmug.com>>
   Sent: 11/9/2017 2:04:48 PM
   Subject: [AFMUG] Negative Voltages...


   I'm working on some support for -48VDC in various products.

   I'm wondering if anyone has encountered a different negative
   voltage than -48VDC in the wild, say -24VDC or similar.The
   main reason why I ask is that it is looking like I'm not going to
   be able to support as wide of range of voltages on the negative
   side as I do for the positive side (12-60VDC), and wondering if I
   really only need to support something along the lines of 32-60VDC
   on the negative side.

   -- *Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
   Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT
   59602
<https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602=gmail=g> 


forre...@imach.com <mailto:forre...@imach.com> |
http://www.packetflux.com <http://www.packetflux.com/>
   <http://www.linkedin.com/in/fwchristian>
   <http://facebook.com/packetflux> <http://twitter.com/@packetflux>






--
Carl Peterson

*PORT NETWORKS*

401 E Pratt St, Ste 2553

Baltimore, MD 21202

(410) 637-3707

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Robert Andrews 

Probably mostly plating with FE as there seems to be a lot of that around...

On 11/09/2017 11:51 AM, Chuck McCown wrote:
The only negative voltage I have ever ran into in telecom has been the 
–48 VDC.

Of course you used to have +/- 15 for RS-232.
Some –5 on the old PC power supplies, no idea where it was used.
I have never seen any other negative voltage used outside the chassis of 
equipment.
Telecom originally was +48 volts until they started using underground 
and buried cables.
With the ring side of the line grounded at the C.O. and the tip side of 
the line powered with +48 any fault in the insulation of an underground 
or buried cable allowed copper ions to leave the wire as electrons were 
entering.  It would corrode the wire into nothingness and copper plate 
the surrounding dirt.
So they swapped polarity grounding the tip side and putting –48 on the 
ring side.  The ions would then transport from the environment to the 
wire thus plating it with who knows what, but the copper was still intact.

*From:* Forrest Christian (List Account)
*Sent:* Thursday, November 09, 2017 12:04 PM
*To:* af
*Subject:* [AFMUG] Negative Voltages...
I'm working on some support for -48VDC in various products.
I'm wondering if anyone has encountered a different negative voltage 
than -48VDC in the wild, say -24VDC or similar.The main reason why I 
ask is that it is looking like I'm not going to be able to support as 
wide of range of voltages on the negative side as I do for the positive 
side (12-60VDC), and wondering if I really only need to support 
something along the lines of 32-60VDC on the negative side.

--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
forre...@imach.com | http://www.packetflux.com

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Chuck McCown 
The only negative voltage I have ever ran into in telecom has been the –48 VDC.

Of course you used to have +/- 15 for RS-232.
Some –5 on the old PC power supplies, no idea where it was used.
I have never seen any other negative voltage used outside the chassis of 
equipment.  

Telecom originally was +48 volts until they started using underground and 
buried cables.

With the ring side of the line grounded at the C.O. and the tip side of the 
line powered with +48 any fault in the insulation of an underground or buried 
cable allowed copper ions to leave the wire as electrons were entering.  It 
would corrode the wire into nothingness and copper plate the surrounding dirt.  

So they swapped polarity grounding the tip side and putting –48 on the ring 
side.  The ions would then transport from the environment to the wire thus 
plating it with who knows what, but the copper was still intact.  

From: Forrest Christian (List Account) 
Sent: Thursday, November 09, 2017 12:04 PM
To: af 
Subject: [AFMUG] Negative Voltages...

I'm working on some support for -48VDC in various products. 

I'm wondering if anyone has encountered a different negative voltage than 
-48VDC in the wild, say -24VDC or similar.The main reason why I ask is that 
it is looking like I'm not going to be able to support as wide of range of 
voltages on the negative side as I do for the positive side (12-60VDC), and 
wondering if I really only need to support something along the lines of 
32-60VDC on the negative side.


-- 

  Forrest Christian CEO, PacketFlux Technologies, Inc.

  Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
  forre...@imach.com | http://www.packetflux.com

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Chuck McCown 
pretty fond of 3.1415 VDC, it fits into round wires quite well

From: Steve Jones 
Sent: Thursday, November 09, 2017 12:06 PM
To: af@afmug.com 
Subject: Re: [AFMUG] Negative Voltages...

i want 31.5 and 60.3

On Thu, Nov 9, 2017 at 1:04 PM, Forrest Christian (List Account) 
<li...@packetflux.com> wrote:

  I'm working on some support for -48VDC in various products. 

  I'm wondering if anyone has encountered a different negative voltage than 
-48VDC in the wild, say -24VDC or similar.The main reason why I ask is that 
it is looking like I'm not going to be able to support as wide of range of 
voltages on the negative side as I do for the positive side (12-60VDC), and 
wondering if I really only need to support something along the lines of 
32-60VDC on the negative side.


  -- 

Forrest Christian CEO, PacketFlux Technologies, Inc.

Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
forre...@imach.com | http://www.packetflux.com

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Adam Moffett 

I'm looking at a 48V Meanwell RSD with an input range of 33.6 - 62.4V.
Seems strangely specific.

-- Original Message --
From: "Robert Andrews" <i...@avantwireless.com>
To: af@afmug.com
Sent: 11/9/2017 2:32:44 PM
Subject: Re: [AFMUG] Negative Voltages...


-62 for Battery conditioning ( equalize )... with surges...

On 11/09/2017 11:20 AM, Carl Peterson wrote:
It should support something like -42 to -60.  The topside is normally 
something like -56 but -60 gives a little margin.


On Thu, Nov 9, 2017 at 2:09 PM, Adam Moffett <dmmoff...@gmail.com 
<mailto:dmmoff...@gmail.com>> wrote:


   __
   I don't recall ever seeing anything other than -48.  Personally if
   you accept the range from "dead battery" to "fast charging 
battery",

   and do something non-destructive when voltage is out of range, then
   I'll be happy as a clam.


   -- Original Message --
   From: "Forrest Christian (List Account)" <li...@packetflux.com
   <mailto:li...@packetflux.com>>
   To: "af" <af@afmug.com <mailto:af@afmug.com>>
   Sent: 11/9/2017 2:04:48 PM
   Subject: [AFMUG] Negative Voltages...


   I'm working on some support for -48VDC in various products.

   I'm wondering if anyone has encountered a different negative
   voltage than -48VDC in the wild, say -24VDC or similar.The
   main reason why I ask is that it is looking like I'm not going to
   be able to support as wide of range of voltages on the negative
   side as I do for the positive side (12-60VDC), and wondering if I
   really only need to support something along the lines of 32-60VDC
   on the negative side.

   -- *Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
   Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT
   59602
   
<https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602=gmail=g>

forre...@imach.com <mailto:forre...@imach.com> |
http://www.packetflux.com <http://www.packetflux.com/>
   <http://www.linkedin.com/in/fwchristian>
   <http://facebook.com/packetflux> <http://twitter.com/@packetflux>






--
Carl Peterson

*PORT NETWORKS*

401 E Pratt St, Ste 2553

Baltimore, MD 21202

(410) 637-3707

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Robert Andrews 

-62 for Battery conditioning ( equalize )... with surges...

On 11/09/2017 11:20 AM, Carl Peterson wrote:
It should support something like -42 to -60.  The topside is normally 
something like -56 but -60 gives a little margin.


On Thu, Nov 9, 2017 at 2:09 PM, Adam Moffett > wrote:


__
I don't recall ever seeing anything other than -48.  Personally if
you accept the range from "dead battery" to "fast charging battery",
and do something non-destructive when voltage is out of range, then
I'll be happy as a clam.


-- Original Message --
From: "Forrest Christian (List Account)" >
To: "af" >
Sent: 11/9/2017 2:04:48 PM
Subject: [AFMUG] Negative Voltages...


I'm working on some support for -48VDC in various products.

I'm wondering if anyone has encountered a different negative
voltage than -48VDC in the wild, say -24VDC or similar.The
main reason why I ask is that it is looking like I'm not going to
be able to support as wide of range of voltages on the negative
side as I do for the positive side (12-60VDC), and wondering if I
really only need to support something along the lines of 32-60VDC
on the negative side.

-- 
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./

Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT
59602


forre...@imach.com  |
http://www.packetflux.com 

 






--

Carl Peterson

*PORT NETWORKS*

401 E Pratt St, Ste 2553

Baltimore, MD 21202

(410) 637-3707

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Carl Peterson 
It should support something like -42 to -60.  The topside is normally
something like -56 but -60 gives a little margin.

On Thu, Nov 9, 2017 at 2:09 PM, Adam Moffett  wrote:

> I don't recall ever seeing anything other than -48.  Personally if you
> accept the range from "dead battery" to "fast charging battery", and do
> something non-destructive when voltage is out of range, then I'll be happy
> as a clam.
>
>
> -- Original Message --
> From: "Forrest Christian (List Account)" 
> To: "af" 
> Sent: 11/9/2017 2:04:48 PM
> Subject: [AFMUG] Negative Voltages...
>
> I'm working on some support for -48VDC in various products.
>
> I'm wondering if anyone has encountered a different negative voltage than
> -48VDC in the wild, say -24VDC or similar.The main reason why I ask is
> that it is looking like I'm not going to be able to support as wide of
> range of voltages on the negative side as I do for the positive side
> (12-60VDC), and wondering if I really only need to support something along
> the lines of 32-60VDC on the negative side.
>
> --
> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.*
> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
> 
> forre...@imach.com | http://www.packetflux.com
>   
>   
>
>


-- 

Carl Peterson

*PORT NETWORKS*

401 E Pratt St, Ste 2553

Baltimore, MD 21202

(410) 637-3707

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Adam Moffett 
I don't recall ever seeing anything other than -48.  Personally if you 
accept the range from "dead battery" to "fast charging battery", and do 
something non-destructive when voltage is out of range, then I'll be 
happy as a clam.



-- Original Message --
From: "Forrest Christian (List Account)" 
To: "af" 
Sent: 11/9/2017 2:04:48 PM
Subject: [AFMUG] Negative Voltages...


I'm working on some support for -48VDC in various products.

I'm wondering if anyone has encountered a different negative voltage 
than -48VDC in the wild, say -24VDC or similar.The main reason why 
I ask is that it is looking like I'm not going to be able to support as 
wide of range of voltages on the negative side as I do for the positive 
side (12-60VDC), and wondering if I really only need to support 
something along the lines of 32-60VDC on the negative side.


--
Forrest Christian CEO, PacketFlux Technologies, Inc.
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
forre...@imach.com | http://www.packetflux.com

Re: [AFMUG] Negative Voltages...

2017-11-09 Thread Steve Jones 
i want 31.5 and 60.3

On Thu, Nov 9, 2017 at 1:04 PM, Forrest Christian (List Account) <
li...@packetflux.com> wrote:

> I'm working on some support for -48VDC in various products.
>
> I'm wondering if anyone has encountered a different negative voltage than
> -48VDC in the wild, say -24VDC or similar.The main reason why I ask is
> that it is looking like I'm not going to be able to support as wide of
> range of voltages on the negative side as I do for the positive side
> (12-60VDC), and wondering if I really only need to support something along
> the lines of 32-60VDC on the negative side.
>
> --
> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.*
> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
> 
> forre...@imach.com | http://www.packetflux.com
>   
>   
>
>