Connecting The Earthing Cable - 3Com 3CR17251-91 - Switch 5500G-EI Stackable Gigabit Ethernet Getting Started Manual

38 C 2: I
HAPTER NSTALLING THE
Connecting the
Earthing Cable
S
WITCH
Figure 14 RPS Connection to the Switch
u p e r S
2 6 6 S
3 C 1 7
NULL
-48 -60V;2 0A
Null
Pinout -
+
When the RPS is connected to the Switch, the circuit breaker in the RPS
can be moved to the closed (on) position and the Switch will be powered
by the -48V DC power.
The -48V DC power will take priority over the AC mains and will power
the Switch if it is connected.
Use the earthing cable that accompanies your Switch if the length is
suitable. Alternatively use the earthing cable specification as defined in
Appendix C on page
The earthing cable is only required if the Switch is powered by the RPS
only.
The recommended cable length should not exceed 3 metres (9.84 feet).
r t
2 4 P o
P S U -
5 5 0 0 G
S w it c h
t a c k 4
N U L L
+ -
z ;1 .0 A
0 /6 0 H
4 0 V ;5
~
1 0 0 -2
A
0 V ;2 .0
-4 8 -6
Cable Tie
139.