110Chapter 11 In-service field maintenance for 5Uenclosures
5. Facing the front of the storage enclosure, verify that the
Power On
LED is green and there are no fault
conditions.
Replace a 5U power supply unit
Both power supply units (PSUs) provide power to the storage enclosure within 200-240VAC at 50-60Hz.
Each PSU has three status LEDs. The asterisk (*) indicates a fault condition.
CAUTION Never remove power from a power supply unit if the partner power supply unit amber LED is
lit.
LED Status
Type PSU fault AC fault PSU OK
N/A
Color Amber Amber Green
State
Off AC power not present
On* Off PSU present, but not supplying power
Flashing Off Firmware download to PSU in progress
Off On AC power present, power switch is on, providing power
Off Flashing AC power present, PSU on standby, other PSU providing power
On* Communication with AP controller module (CM) lost
On* N/A Off PSU hardware fault
On* Off PSU alert state or hardware fault: over temperature, over voltage, or over current
Off On* Off AC power failed, PSU not providing power, other PSU providing power
Off On* AC power failed, PSU running on battery
Figure 89 Power supply unit fault LEDs
An important feature of the storage enclosure design is redundancy. The enclosure will maintain continuous
operation during the replacement of a single PSU, if it is within the time limit of 7 minutes, since removal of a
PSU significantly reduces airflow in the storage enclosure.
CAUTION Use only power cords supplied in the installation kit or those that meet product specifications.
CAUTION Adhere to power source and power connection requirements to avoid harm to equipment.
l
Only connect the power supply unit (PSU) to power sources that comply with product specifications and
labels.
l
Always remove all power connections before you remove a PSU from the storage or expansion enclosure.
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