Note: Depending on the power supply type, your power supply might look slightly different from the
following illustration.
Figure 477. Power supply LEDs
LED Description
1 Input status The input status LED can be in one of the following states:
• Green: The power supply is connected to the input power source.
• Off: The power supply is disconnected from the input power source.
2 Output status The output status LED can be in one of the following states:
• Green: The server is on and the power supply is working normally.
• Blinking green: The power supply is in zero-output mode (standby). When the server power
load is low, one of the installed power supplies enters into the standby state while the other
one delivers entire load. When the power load increases, the standby power supply will switch
to active state to provide sufficient power to the server.
To disable zero-output mode, log in to the Lenovo XClarity Controller web interface, choose
Server Configuration ➙ Power Policy, disable Zero Output Mode, and then click Apply. If
you disable zero-output mode, both power supplies will be in the active state.
• Off: The server is powered off, or the power supply is not working properly. If the server is
powered on but the power output LED is off, replace the power supply.
3 Power supply
error LED
• Off: The power supply is working normally
• Yellow: Dump the FFDC log from affected systems and escalate to next level for PSU data log
reviewing.
System-board-assembly LEDs
The following illustrations show the light-emitting diodes (LEDs) on the system-board-assembly which
contains the system I/O board and processor board.
470
ThinkSystem SR650 V3 User Guide
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