2. Repeat step 1 for the other cable wire.
Installing an 800 W DC Power Supply
Before installing an 800 W DC power supply (part no. XN-DCPWR-800W-F or XN-
DCPWR-800W-R), verify that the airow direction for the power supply is the same
as the airow direction of the installed fan modules in the switch.
To install the power supply, follow these steps:
Caution
The handle on the power supply is not designed to be used to lift or carry the
power supply or the switch to which it is attached.
1. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end
to an appropriate ground point on the rack.
2. If necessary, remove a blank panel from the rear of the switch.
3. Verify that the power supply is right side up (label on the bottom).
4. Carefully slide the power supply all the way into the power supply bay.
5. Push the power supply in until the latch snaps into place.
Caution
Do not slam the power supply into the switch.
6. To install a second power supply, repeat the procedure.
When you are nished, connect the ground wire to each power supply. See Connect
the Ground Wire to an 800 W DC Power Supply on page 65.
Connect the Ground Wire to an 800 W DC Power Supply
Follow these steps to connect the ground wire to a 800 W DC power supply.
Warning
Connect the chassis ground wire before you connect any power cables.
Warning
Disconnect the ground wire after you disconnect all power cables.
1. Verify that the DC circuit is de-energized.
2. Attach an ESD-preventive wrist strap to your bare wrist and connect the metal end
to an appropriate ground point on the rack.
3. Connect the ground wire to the grounding point on the power supply, labeled GND.
Directly beneath the grounding point, you will see the international symbol for earth
ground – – on the body of the switch.
a. Attach the ring lug to the 6 AWG ground wire.
b. Secure the ring lug with a 5mm hex socket and tighten.
Install the Switch Install an 800 W Internal DC Power Supply
Extreme 7520 Hardware Installation Guide 65
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