Replace Fan Modules - Extreme Networks 7720 Installation Manual

Replace Fan Modules

Figure 29: Connecting the DC Power Cord
4. The installation electrician connects the other end of the power cord to the building
power system.
a. Connect the ring terminal of the yellow and green ground wire to a known
reliable earth ground point at your site.
Figure 30: DC Power Cable
Use the following for the building wire harness:
Cable Connector
Pin 1
Pin 2
Pin 3
b. Connect the ring terminal of the red RTN power cable to the positive terminal
of the DC power source, and connect the ring terminal of the black -48V power
cable to the negative terminal of the DC power source.
5. Repeat these steps for each power supply.
Leave the ESD strap permanently connected to the rack, so that the strap is always
available when you need to handle ESD-sensitive components.
Replace Fan Modules
You can replace fan modules as needed while the switch is operating ("hot swapping").
72 Extreme 7720 Hardware Installation Guide
Warning
Before installing, be sure to connect the chassis ground wire before you
connect any power cables.
Wire Color
Black
Red
Yellow/Green
Remove and Replace Components
-48V
RTN
GRD
Ring Terminal
Pin 3
Pin 2
Pin 1