Installation Guide

6 Slide the cover into place over the terminal block.
7 Energize the DC circuit.
Replacing a Summit 550 W DC Power Supply
Summit 550 W power supply units (PSUs) are available with either front-to-back or back-to-front
airflow. If you install two PSUs, both must have the same airflow direction.
Note
You cannot combine power supplies of dierent wattages in the same switch.
You need the following tools and materials to replace a 550 W DC power supply:
•
#1 Phillips screwdriver
•
Torque screwdriver and wrench or torque driver with attachments for tightening screws and nuts
•
Thermal protective gloves (required for removal of a power supply)
Removing a 550 W DC Power Supply
To remove an installed 550 W DC power supply, follow these steps:
Caution
The DC power supply may be hot to the touch; use thermal protective gloves when handling
the power supply during removal.
1 De-energize the DC circuit.
2 Disconnect the DC power cables:
a Pull the cover o the terminal block.
b Loosen the screws that secure the cable terminals to the terminal block.
c Slide the wires out from under the captive washers.
Warning
Be sure to disconnect all power cables before you disconnect the chassis ground wire.
3 Disconnect the ground wire as follows:
a Loosen the screw that secures the ground wire to the terminal block.
b Slide the wire out from under the captive washer.
4 Note the orientation of the installed power supply.
Replacing DC Power Supplies
ExtremeSwitching and Summit Switches: Hardware Installation Guide 287