AC450NX Rack Server System Product Guide
110

Hot Swapping a Power Supply

In a fully configured server, the power system contains three 750 watt auto-ranging power
supplies; one of the power supplies is redundant. If a single power supply fails in the redundant
power system, the yellow power supply failure LED on the front panel turns on. You can easily
hot-swap the defective power supply without turning the server power off.
Power supplies are hot-swappable only in configurations with three power supplies.
WARNING
Because of chassis airflow disruption, the power supply bay should not
be vacant for more than two minutes when server power is on.
Exceeding the two-minute limit may cause damage to certain peripheral
components.
Before replacing a power supply in a two-power supply configuration,
you must turn off power to the server.
A filler panel is required in a two-power supply configuration. The
filler panel must be installed within two minutes when moving from a
three-power supply configuration to a two-power supply configuration.
✏NOTE
If the system contains less that two power supplies or AC is not present in at
least two power supplies and midplane jumper JP1 is removed, the system
will automatically shutdown.
In a three-power supply configuration a power supply can be swapped at any
time.

Removing a Power Supply

CAUTION
If the chassis contains only two power supplies, turn off all peripheral
devices connected to the server. Then turn off the server power with the
push-button on/off switch on the front panel.
See Figures 11-1.
1. Look at the yellow FAIL LEDs on the power supplies to determine which one is defective.
2. Pull the power supply handle down to unlock it from the chassis.
3. Pull the power supply toward you to unplug it.
4. Remove the defective power supply, and set it aside.