IBM 2145UPS-1U Hardware Installation Manual page 112

Power LED
Location LED
System-error LED
Ac and dc LEDs
The ac and dc LEDs indicate whether the node is receiving electrical current.
Ac LED
Dc LED
Ac and dc LEDs on the SAN Volume Controller 2145-8F4 and the SAN Volume
Controller 2145-8F2:
The ac LED and dc LED are located on the rear of the SAN Volume Controller
2145-8F4 and the SAN Volume Controller 2145-8F2.
Figure 43 on page 75 shows the location of the ac and dc LEDs.
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IBM System Storage SAN Volume Controller: Hardware Installation Guide
This is the top of the three LEDs and indicates the following:
Off One or more of the following are true:
v No power is present at the power supply input
v The power supply has failed
v The LED has failed
On The SAN Volume Controller is powered on.
Flashing
The SAN Volume Controller is turned off but is still connected to a
power source.
This is the middle of the three LEDs and is not used by the SAN Volume
Controller.
This is the bottom of the three LEDs that indicates that a system board
error has occurred. The light path diagnostics provide more information.
1
The upper LED next to the power supply, indicates that ac current is
present on the node.
2
The lower LED next to the power supply, indicates that dc current is
present on the node.