Replace A 5U Power Supply Unit - Quantum QXS Series Hardware Installation And Maintenance Manual

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
Type PSU fault AC fault PSU OK
Color Amber Amber
On*
Flashing
Off
Off
State
On*
On*
Off
Off
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.
Only connect the power supply unit (PSU) to power sources that comply with product specifications and
l
labels.
Always remove all power connections before you remove a PSU from the storage or expansion enclosure.
l
110 Chapter 11 In-service field maintenance for 5U enclosures
Status
N/A
Green
Off AC power not present
Off PSU present, but not supplying power
Off Firmware download to PSU in progress
On AC power present, power switch is on, providing power
Flashing AC power present, PSU on standby, other PSU providing power
On* Communication with AP controller module (CM) lost
N/A Off PSU hardware fault
Off PSU alert state or hardware fault: over temperature, over voltage, or over current
On* Off AC power failed, PSU not providing power, other PSU providing power
On* AC power failed, PSU running on battery
Figure 89 Power supply unit fault LEDs