I remember Ken pointing out that even fast-blow fuses have a time delay.
If they're running right up around the limit, it does take time to open.
I think the last thing you want to do is put in a bigger fuse if you
suspect return path and/or polarity issues. Mixed voltages and -/+
return can really be a PITA to figure out sometimes. I would second the
suggestion for popping in a Mean Well RSD if only to figure out if you
have mixed chassis grounds. Cat5 shields come to mind. Are you passing
the shields through the WB SS's?
On 10/7/2015 10:41 PM, TJ Trout wrote:
Does everything power normally prior to the fuse blowing? Does the
ptp600 power and ping? Is the fuse properly sized?
On Wed, Oct 7, 2015 at 2:22 PM, David <[email protected]
<mailto:[email protected]>> wrote:
We have to use the duracom dc dc isolators for them but no issues
once we do it.
Basically same thing using meanwell product.
On 10/07/2015 03:29 PM, Gino Villarini wrote:
no, will try-
On Wed, Oct 7, 2015 at 4:27 PM, Josh Baird <[email protected]
<mailto:[email protected]>> wrote:
Have you tried isolating the PTP600 with a DC/DC converter
(Meanwell RSD, etc) in between the rectifier and PIDU?
On Wed, Oct 7, 2015 at 4:24 PM, Gino Villarini
<[email protected] <mailto:[email protected]>> wrote:
ill check, but we did a bench test and it did not
replicate the issue
On Wed, Oct 7, 2015 at 4:19 PM, Chuck McCown
<[email protected] <mailto:[email protected]>> wrote:
If you put the PIDU and PTP600 on a cardboard box or
other insulating surface, can you see –48 VDC on
their cases or chassis?
*From:* Gino Villarini <mailto:[email protected]>
*Sent:* Wednesday, October 07, 2015 2:17 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Issue with a -48 vdc Site!
ground loop? Please Help!!
i think so, afaik is floating ground
On Wed, Oct 7, 2015 at 4:15 PM, Chuck McCown
<[email protected] <mailto:[email protected]>> wrote:
Is the chassis of the PIDU or the PTP600
connected to your common ground?
*From:* Gino Villarini <mailto:[email protected]>
*Sent:* Wednesday, October 07, 2015 2:14 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* [AFMUG] Issue with a -48 vdc Site!
ground loop? Please Help!!
So we are moving a site form AC to DC -48
this is the setup:
Emerson Rectifier feeding:
Telco System MPLS router
Planet Fiber SW
2 Netonix DC Switches
2 SAF POE Injectors
2 PTP600 PIDUs
AFAIK all the mentioned gear above are floating
ground
We have this gear connected to the Netonix:
Airfiber24, Epmp, PMP450
all wireless gear is using shielded cable that is
terminated in a WBMGF SS on the rack
So this is the issue, we migrated everything to
DC, when we connect the PTP600 PIDU to the
rectifier, the fuse on the emerson output feeding
the Netonix blows..not instantly.. it takes some
30-45 secs..
im scratching my head on this one... any ideas?
