Lenovo ThinkSystem SR950 Setup Manual page 39

For information about minimum power supply requirements and power redundancy, see "power supply
criteria in the "Install a power supply" topic" on page 128.
Each hot-swap power supply has three status LEDs. See Figure 8 "Rear LEDs" on page 35 for information.
Rear LEDs
Figure 8 "Rear LEDs" on page 35 illustrates the LEDs on the rear of the server.
Figure 8. Rear LEDs
Table 31. Power supply LEDs
LED Description
1
Input status
The input status LED can be in one of the following states:
(AC) (green)
• Off. The power supply is not receiving the correct input power: either the power supply is not
correctly connected to the power source, the power source is not outputting power, or the
power source output does not meet the power supply input requirements (for example, a
1600-watt power supply will not run off of 120 vac input).
• On. The power supply is receiving the correct input power and the power supply is operating
normally.
2
Output status The output status LED can be in one of the following states:
(DC) (green)
• Off. The server is powered off (not connected to input power), the power supply is not working
correctly (Fault LED is on), or the system has overloaded the power supply (Fault LED is Off).
• On. The server is connected to input power (server powered on or in standby) and the power
supply is working normally.
3
Fault LED
• Off. The power supply is working correctly. If the Output status (DC) LED is also off and the
(yellow)
system will not power on, the system is overloading the power supply.
• On. The power supply has failed. Replace the power supply.
.
Chapter 2 Server components
35