APC RAID Subsystem SCSI-SATA II - Manual (Page 14)

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6. Cooling Fan module
Two blower fans are located at the rear of the subsystem. They provide sufficient
airflow and heat dispersion inside the chassis. In case a fan fails to function, the
“
” Fan fail LED will turn red and an alarm will sound.
7. Power Supply Power On Indicator
Green LED indicates power is on.
8. System Power On Indicator
Green LED indicates power is on.
9. Power Supply Unit 1 ~ 2
Two power supplies (power supply 1 and power supply 2) are located at the rear
of the subsystem. Turn on the power of these power supplies to power-on the
subsystem. The “power” LED at the front panel will turn green.
If a power supply fails to function or a power supply was not turned on, the “ ”
Power fail LED will turn red and an alarm will sound.