Up to four 1,600 watt power supply modules can be installed in the Extreme 9920 chassis. Each power supply is self enclosed and vents directly to the rear of the chassis. If the chassis has more than two power supplies installed, power supplies are hot-swappable. The power supply slots are situated in the four contiguous slots starting from the left-hand side to the bottom and the rear of the chassis. They are numbered PSU 1 through PSU 4.
Note
Do not remove the cover from the fifth, or last, power supply slot on the far right to the bottom and the rear of the chassis.
The DC power supply does not ship installed and must be ordered separately. A DC power cord is provided with the DC power supply.
Caution
Make sure that the DC power supply circuit is not overloaded. Use proper overcurrent protection, such as a circuit breaker, to prevent overcurrent conditions. You can use up to a 36-Amp or greater breaker.Use the following tasks to install a DC power supply in a switch:
You need the following tools and materials to install or remove a DC power supply.
Note
Before installing a DC power supply, verify that the airflow direction for the power supply is the same as the airflow 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.
Caution
Do not slam the power supply into the switch.When you are finished, use the DC power input cable that is provided with the DC power supply to ground the power supply and connect the power supply to the power source. Follow the instructions in Connect a DC Power Supply to the Source Voltage.
The DC power connection at your facility must be made by a qualified 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.
Warning
Before installing, be sure to connect the chassis ground wire before you connect any power cables.Warning
Before removing, be sure to disconnect the ground wire after you disconnect all power cables.Use the following for the building wire harness:
| Pin 3 | Red | -DC |
| Pin 2 | Yellow | FGRND |
| Pin 1 | Black | +DC |
Leave the ESD strap permanently connected to the rack, so that the strap is always available when you need to handle ESD-sensitive components.
After connecting the DC power supply to the power source, the DC circuit can be energized. Follow the instructions in the topic Turn on the Extreme 9920 to energize the DC circuit. The LED light for the DC power supply unit is solid green when connected and operating normally.