Extreme Networks BlackDiamond 6808 User manual

Part Number: 121024-00 Rev 02 1
BlackDiamond DC Power Supply
Installation Note
Overview
This installation note describes the BlackDiamond™DC Power Supplies, lists the steps required
to prepare the power supplies and the cabling, explains how to terminate the cabling, and lists
the steps required to remove and replace a power supply.
The BlackDiamond 6808 chassis accommodates two power supplies, and the BlackDiamond
6816 chassis accommodates four power supplies. There are three types of power supplies
available: 110 VAC, 220 VAC, and -48 VDC. All installed power supplies must be of the same
type. This document describes -48 VDC power supply installation only.
Caution: Service to BlackDiamond power supplies should be performed by trained
service personnel only. Before installing or removing any components of the system, or
before carrying out any maintenance procedures, read the safety information provided in
Appendix A of the BlackDiamond Hardware Installation Guide.
Table 1 lists the BlackDiamond DC power supply operating ranges. DC input ranging from -42
to -72 V.
The power supplies are fully fault tolerant. They are also load-sharing, so that if one power
supply fails, the other power supply will provide sufficient power to operate a fully loaded
chassis.
The BlackDiamond chassis power supply slot is designed for standard 5" x 8" footprint power
supplies. Each power supply contains a cooling fan. Air enters from the front vent holes on the
power supply and exits from the back vent holes of the chassis, as illustrated in Figure 1. This
airflow is independent of the airflow through the modules.
Table 1: BlackDiamond DC Power Supply Operating Ranges
Input Output
-42 to -72 V 1971 W

BlackDiamond DC Power Supply Installation Note 2
Overview
Figure 1: Airflow through the BlackDiamond chassis
If a power supply’s fans fail, immediately remove the power supply from the chassis.
Because the power supply airflow is separate from the chassis airflow, as illustrated in
Figure 1, heated air from the power supply will not be sufficiently vented if the power
supply fans fail.
Equipment Required
You must have the following:
•
1
/
4
” or
5
/
16
” flathead screwdriver
•#1 Phillips-head screwdriver
•4 AWG, high-strand-count wire cable
•Three 2-hole lugs (included with your power supply)
1234AB5678
BD_024
Air flow
through
chassis
50015
50015
DC IN
-48V
-48V RET
POWER
i
DC OUT
50022
SINGLEDC PSU
V
48V, 60A
DC IN
-48V
-48V RET
POWER
i
DC OUT
50022
SINGLEDC PSU
V
48V, 60A
Air flow through
power supplies

BlackDiamond DC Power Supply Installation Note 3
Preparing the Power Supplies
•Six lockwashers (included with your power supply)
•Six nuts (included with your power supply)
Preparing the Power Supplies
The DC inputs to the power supplies are on the front of the power supply. The input terminals
are isolated from the ground terminal. Power supplies slide in from the front of the chassis, as
illustrated in Figure 2.
Figure 2: BlackDiamond DC power supplies
The front of the power supply has a handle with a cam lever mechanism for both insertion and
removal of the power supply. The front panel also provides status LEDs. Table 2 describes the
LED behavior on the DC power supplies.
Each power supply has 5 outputs that connect to the chassis. These 5 outputs provide power for
the entire chassis.
Selecting the Cabling
Use the following guidelines when selecting cabling for the DC power supplies:
•Each DC power supply requires dedicated 55 A service.
Table 2: BlackDiamond DC Power Supply LEDs
LED Color Indicates
DC in Green Input voltage is within range
Amber Input voltage is outside of range
Off Input voltage is below 12V
DC out Green All DC outputs are operational
Amber One or more DC outputs have failed
Off Input voltage is below 12V
BD_DCpsx
DC IN
-48V
-48V RET
POWER
DC OUT
-48V
-48V RET
DC IN
50022
i
POWER
i
SINGLEDC PSU
DC OUT
50022
SINGLEDC PSU
V
48V, 60A
V
48V, 60A

BlackDiamond DC Power Supply Installation Note 4
Removing and Replacing a Power Supply
•For DC power cables, use 4 AWG, high-strand-count wire cable.
Attaching the Cabling
To attach the cable to the lugs, perform the following steps.
1Strip 0.5 inches of insulation from the 4 AWG, high strand-count cable.
2Insert the cable into the cable lugs.
Caution: Ensure that no copper is visible between the lug and the cable insulation.
3Tighten the cable retention screw, using a
1
/
4
” or
5
/
16
” flathead screwdriver, to 20 in-lbs of
torque. The cable retention screw is shown in Figure 3.
Figure 3: 2-stud lug
Each set of power terminals on the DC power supply consists of two 6-mm, metric-threaded,
nickel-plated, brass studs centered 0.625 inch apart. The earth ground studs extend 0.52 inch
(13.2 mm) above the power supply faceplate; the set of positive (+) and negative (–) studs
extend 0.9 inch (22.9 mm) above the faceplate. The nickel plating on the studs enhances
conductivity and resists corrosion.
For convenience, the lock washers and nuts for connecting the source DC cables to the power
terminals are loosely mounted on the studs ready for use.
Removing and Replacing a Power Supply
BlackDiamond power supplies are hot-swappable. You can add a second power supply without
powering off the chassis. If you have two power supplies installed, you can remove one of them
without powering off the chassis.
To remove a power supply, follow these steps:
1Remove the power supply cords from the power supply.
2Unscrew the power supply using a #1 Phillips-head screwdriver.
3Disengage the power supply by rotating the handle out and down, as illustrated in Figure 4.
DC_lug
Cable retention screw

BlackDiamond DC Power Supply Installation Note 5
Removing and Replacing a Power Supply
Figure 4: BlackDiamond DC power supplies
4Slide the power supply out of the chassis.
Caution: Do not handle the power supply using the DC output bus bars.
To install a power supply, follow these steps:
1Ensure that the replacement power supply is right-side up, and the locking handle is open.
2Slide the power supply into the bay.
Caution: Do not slam the power supply into the backplane.
3Secure the power supply by pushing down on the locking handle until it clicks in place.
4Tighten the screws using a #1 Phillips-head screwdriver.
5Attach the power supply cords.
BD_DCps
x
DC IN
-48V
-48V RET
POWER
DC OUT
-48V
-48V RET
DC IN
50022
i
POWER
i
SINGLEDC PSU
DC OUT
50022
SINGLEDC PSU
V
48V, 60A
V
48V, 60A