Connecting To Dc Power - Alcatel-Lucent 7210 Installation Manual

Connecting to DC Power

Below the DC power entry block is an additional chassis ground point for attaching a
Notes:
DC power chassis ground if required by local electrical codes. The ground point should be connected
with an M4 screw and a terminal lug as specified by local electrical codes.
Notes: Do NOT install BOTH the -48V and the +24V AC PEMs in the same chassis.
Notes: If a single power feed (either #A or #B) is connected to provide power to the system, it supplies power
to both the power supplies, if both of them plugged in. The DC power feeds, #A and #B, are internally bridged
using a diode.
WARNING:
Before wiring the DC plug or connecting power to the switch, ensure that power to the feed lines is
turned off at the supply circuit breaker or disconnected from the power bus.
7210 SAS-E Installation Guide
The 7210 SAS-E chassis supports the -48V and +24V DC power modules. Hence, the
steps below are applicable for either the -48V or the +24V DC power modules.
To connect DC power:
Step 1 Before a VDC power supply module can be used, you must connect an
external DC power source to the DC power connection on the left side of the
front panel (see
36 to -72 VDC, and protected with a circuit breaker.
Step 2 To provide adequate circuit protection between the DC power supply and the
switch, all intermediate wiring and circuitry should be rated to carry a load at
least two times the maximum rating for this switch (see
Specifications" on page
The wiring between the DC power supply and the switch must be stranded
Step 3
copper wire within the range of 16 to 20 AWG.
Step 4 Connect the VDC power feed using the VDC input and RETA/B (return)
lines for power source A and B, respectively. Insert the wires into the DC
input plug (using a small flat-tip screwdriver). Color code the wiring
according to local standards to ensure that the input power and ground lines
can be easily distinguished.
Figure 1). The external DC power supply must be between -
75).
Installing the 7210 SAS-E
"Appendix A:
Page 39