Transition Networks
SM24DPB Install Guide
33681 Rev. B
https://www.transition.com
Page
19
of
24
Optional
DC
Power
Supply
The
SM24DPB
provides
dual
power
inputs
on
the
front
panel
of
the
switch
for
power
redundancy
requirement.
The
SM24DPB
switch
has
100~240
VAC
power
socket
for
AC
power
Input
and
‐
36VDC
~
‐
48VDC
power
input
via
terminal
block.
With
the
AC/DC
Dual
Power
Supply,
power
failover
occurs
when
power
supplies
are
connected
to
different
circuits
for
reduced
network
operating
risk.
Several
power
supply
models
are
available
from
Transition
Networks.
Warning
:
You
must
use
an
isolated
power
supply
in
order
for
Transition
Networks
to
honor
the
warranty.
The
power
supplies
that
Transition
Networks
makes
available
are:
□
25105
‐
Mean
Well
SDR
‐
120
‐
48
□
25131
–
MEANWELL
SDR
‐
75
‐
48
Industrial
Power
Supply
25104
(Mean
Well
SDR
‐
240
‐
48)
INPUT
:
100
‐
240VAC
2.6A
50/60
Hz
OUTPUT
:
48V
‐
5A
“Use
copper
wire
only”
“Maximum
surrounding
air
temperature:
60°C”
“Instructions
for
installation
in
a
pollution
degree
2
environment”
Terminal
Torque
:
7
Lb
‐
in
(DC
connections
at
top
of
PS).
Terminal
Torque
:
4.4
Lb
‐
in
(AC
connections
at
bottom
of
PS).
+V
ADJ
:
access
to
small
Phillips
screw;
turn
clockwise
to
increase
voltage.
Adjustable,
48
‐
55V.
DC
OK
LED
:
lights
to
indicate
a
DC
OK
condition.
With
both
the
AC
and
DC
(25105)
Power
Supplies
connected
both
the
CLI
and
the
web
GUI
show:
AC
Power
On
11.95V
;
DC
Power
On
11.86V
.
With
just
the
DC
supply
connected
the
ALM
(Alarm)
LED
lights
in
Red.
See
the
SM24DPB
Quick
Start
Guide
for
Power
Requirements,
Isolation,
Redundant
Power
Inputs,
Power
Connection,
and/or
Chassis
Ground
information.
