– Nonport-side air exhaust
– Port-side air intake
– Front-to-back (port-side to nonport-side)
airflow
– Part numbers ending with -F
Power supply assembly unit fault indicators
Use one of the following methods to determine the status of the power supply assemblies:
• Check the power supply LED, Refer “Power supply LEDs” on page 52to interpret the meaning of LED
operation.
• In Web Tools, click the Power Status icon.
• Enter the psShow command at the prompt to display power supply assembly status, as shown in the
following example:
Device:admin> psshow
Power Supply #1 is OK
Power Supply #2 is OK
Power supply assembly task guide
You can perform an easy set of steps to install or replace a power supply assembly or to replace both
power supply assemblies. By default, both of the power supply assemblies are installed in the device.
Installing an additional power supply (hot-install)
If your device is up and running with a single power supply assembly and you want to install an additional
power supply, complete the following steps.
1. Insert the new power supply assembly.
2. Plug in the power cord on to the power supply assembly and the power source.
3. Turn on power source.
4. Verify the power supply assembly OK and FAIL status LEDs.
Replacing a power supply (hot-swap)
If your device is up and running with two power supply assemblies, but one of them has failed, complete
the following steps.
1. Power down source for the old or failed power supply assembly.
2. Remove the old or failed power supply assembly.
3. Insert the new power supply assembly.
4. Power on the source for the new power supply assembly.
5. Verify the power supply assembly OK and FAIL status LEDs.
Replacing both power supplies (cold-swap)
If your device is up and running with both power supply assemblies, and you want to replace both of
them, complete the following steps.
1. Shut down the system using the sysShutdown command.
2. Power down both power supply assemblies.
3. Remove the power supply assemblies being replaced.
Chapter 7. Power Supply Assemblies
57
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