IBM 8677 - BladeCenter Rack-mountable - Power Supply Hardware Maintenance Manual And Troubleshooting Manual page 25

Rear system LED panel: The LEDs on this panel provide status information for
your BladeCenter unit. These LEDs duplicate the LEDs in the front system LED
panel, see "System LED panel" on page 17 for more information about these LEDs.
Blower module:
Blower error
LEDs
Important: If the ambient temperature is 72° F or below, the BladeCenter blowers
will run at 30% of their maximum rotational speed, increasing their speed as
required to control internal BladeCenter temperature. If ambient temperature is
above 72° F, the blowers will run at 80% of their maximum rotational speed
increasing their speed as required to control internal BladeCenter temperature.
Blower error LEDs: The amber LED on each blower is lit and stays lit when an
error has been detected in the blower. The system-error LED on the BladeCenter
system LED panels is also lit. For additional information, see "Identifying problems
using the Light Path Diagnostics feature" on page 29.
I/O (switch) module: See the documentation that comes with each I/O module for
a description of the LEDs on the I/O module.
Power module: Several types of power module, with different wattage ratings, can
be used in the BladeCenter E unit.
The following illustration shows the rear view for older power modules.
Note: The illustrations might differ slightly from your hardware.
AC power
AC
DC
DC power
Chapter 1. General information
15