You're thinking of their CAT5 surge protectors.
200SSH is the DC surge protector which was (or is) an accessory for the
CMM4.
On 2/19/2016 4:02 PM, Sean Heskett wrote:
600SSH I think is the newest.
On Friday, February 19, 2016, Adam Moffett <[email protected]
<mailto:[email protected]>> wrote:
The latest model is 200SSH. These were bought new (or allegedly
new) within the past few months.
They haven't discontinued it have they?
On 2/19/2016 3:42 PM, Sean Heskett wrote:
Isn't the 200SS about 10 years old.
I'd replace it with something newer
On Friday, February 19, 2016, Adam Moffett <[email protected]
<javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
I would have assumed they weren't supposed to short the + and
- wires when clamped. That would be the opposite of
protection lol. I also don't get why the short to stay there
with the power shut off. I spent a good 15-20 minutes
checking things with the power shut off, and the short didn't
go away until I disconnected and reconnected wires on the
SS. I would have guessed the clamping would stop when the
over current or over voltage condition went away.
I did eventually find literature saying that the 200SS can
take up to 6.5amps. This BS uses 90 watts on bootup, and
maybe 60 watts in normal operation. The spec sheet says 125
Watt max. So somewhere from 1.5 to 2.5 amps.
Maybe that particular SS is just broken in some way? If so,
it's a dangerous mode of failure.
On 2/19/2016 2:30 PM, George Skorup wrote:
Definitely sounds like the SS was clamping. Maybe the SS
thought a surge occurred at initial startup of the power
supply? And FYI, I have used Traco TSP 48v supplies with
-48 radios just fine, output is floating.
On 2/19/2016 10:40 AM, Adam Moffett wrote:
...my first thought of course was maybe it was hooked
up wrong the first time. The four 16ga wires hold
their shape pretty well and I didn't have to re-bend
them to fit, so I'm pretty sure they were on there
correctly.
People talk about SS's "clamping" or "clamping to
ground". Could that cause a short? I never tested
the power wires against ground.
If you're thinking +48 and -48 mixed on the tower,
there are only two devices on the tower right now.
One base station and one backhaul, and they're both
-48. There's some 24v stuff in the enclosure at the
bottom (switch, site monitor), but none of those have
a ground referenced to power and they're isolated
from the other stuff by a 48v to 24v converter.
On 2/19/2016 11:27 AM, Adam Moffett wrote:
So I went out to a new location yesterday
afternoon just to turn the breakers on. The
power co had just plugged in the meter a few days
prior.
The Traco 48v power supply there immediately went
into an alarm state. After some troubleshooting
I found a dead short on the -48v power bus
(terminal blocks with jumpers actually). The
short ended up being on the power cable to a
Wimax base station, I read 0 ohms between + and -
on that cable.
There's a Motorola 200SS surge suppressor within
5' of the power bus, and then about 80' of wire
to the base station. I checked resistance
between + and - on each side of the SS and read 0
ohms both ways. There are actually 4x 16ga wires
going to the top, so two were screwed down to +
on the load side of the SS and two on the - side.
That whole part was backstory. This is where the
mystery starts.
I pulled all 4 wires off the load side of the SS
to see if I could narrow down which pair was
shorted, and I couldn't find a short. I checked
the load side and the supply side of the SS and
it was open on both sides. So then I reconnected
the wires to the SS and checked again - no
short. I plugged the BTS back into the
bus...powered up just fine.
So where did the short circuit come from and
where did it go? In hindsight it seems like it
had to be in the SS or before it. If it was
shorted at the top there would have been > 0 ohms
of resistance with the 80' of wire.
