The power supplies on the Sun Server X2-4 are redundant. That is, the server needs only one power supply to operate. Redundant power supplies enable you to remove and replace a power supply without shutting down the server, provided that the other power supply is online and working.
Caution - If a power supply fails and you do not have a replacement available, to ensure proper airflow, leave the failed power supply installed in the server until you replace it with a new power supply.
This section describes how to remove and install power supplies.
Each power supply contains a series of LEDs on the back panel of the system as shown in Power Supply Status LEDs .
Figure 3-7 Power Supply Status LEDs
Power Supply Status LED Descriptions describes the functions of the LEDs.
Table 3-3 Power Supply Status LED Descriptions
The following LEDs are lit when a power supply fault is detected:
Front and rear Service Action Required LEDs
Rear PS Fault LED on the front bezel of the server
Service Action Required LED on the faulty power supply
Use the following procedures to remove and install power supplies.
Caution - Hazardous voltages are present. To reduce the risk of electric shock and danger to personal health, follow the instructions.
Refer to Removing a Power Supply when completing the following procedure.
A lit Service Action Required LED on a power supply indicates that a failure was detected.
Caution - Whenever you remove a power supply, you should replace it with another power supply; otherwise, the server might overheat due to improper airflow. If a new power supply is not available, leave the failed power supply installed until it can be replaced.
Figure 3-8 Removing a Power Supply
Refer to Installing a Power Supply when completing this procedure.
Caution - Install an A239A or A239C power supply, labeled for upright installation, in the Sun Server X2-4. The A239A/A239C power supply correctly exhausts air from the rear of the server. Do not install an A239 or A239B power supply, which might cause the system to overheat and shut down.
Figure 3-9 Installing a Power Supply