c. Gently tug the ground wire to make sure it is fastened securely.
4. Connect the other end of the wire to a known reliable earth ground point at your
site.
When you have connected the ground wire, connect the power supply to the power
source using the two input cables. Follow the instructions in Connect an 800 W DC
Power Supply to the Source Voltage on page 66.
Connect an 800 W DC Power Supply to the Source Voltage
Two 800 W DC power supply modules are available: models XN-DCPWR-800W-F (front-
to-back airow) and XN-DCPWR-800W-R (back-to-front airow). They can connect to a
–48 V power source.
The DC power connection at your facility must be made by a qualied electrician,
following these instructions.
Warning
Always make sure that the DC circuit is de-energized before connecting or
disconnecting the DC power cables on the DC power supply.
Caution
Provide proper connection and strain relief on the DC power cables in
accordance with all local and national electrical codes.
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. Plug the connector that contains the negative (V+DC) and positive (V-DC) wires to
the power supply.
4. Connect the cables to the DC source voltage, using hardware appropriate to the
installation site and following local and national electrical codes.
Power up to the switch, following the steps in Turn on the Switch on page 66.
Leave the ESD strap permanently connected to the rack, so that the strap is always
available when you need to handle ESD-sensitive components.
Turn on the Switch
An AC power cord is not included with the AC power supply. You can purchase AC
power cords for use in the US and Canada from Extreme Networks or from your local
supplier. The cord must meet the requirements listed in Power Cord Requirements for
AC-Powered Switches and AC Power Supplies on page 98.
For devices that are connected to AC power, connect the power cord to the AC power
input socket on the device (or power supply) and to an AC power outlet.
If the PSU LEDs do not turn green, refer to the 800 W AC Power Supply LEDs on page
82 topic for your device for troubleshooting information.
Turn on the Switch Install the Switch
66 Extreme 7520 Hardware Installation Guide
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