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Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
OL-27644-01
Chapter 6 Installing and Upgrading Internal Modules and FRUs
Replacing a Fan Tray
Warning
Care should be taken while removing the power supplies and power inverters (especially in boost
mode of operation). If the total power consumption is higher than can be supported by one power
supply alone and in this condition a power supply is removed, the hardware can be damaged. This
may then result in the system being unstable or unusable.
The following messages are expected behavior when you try to reload or insert a PoE supply in a router
with Ethernet Switch Network Module:
Aug 10 18:29:40.331: %ILPM_FAULT-5-ILPM_NOTICE: Notice: Inline power supply is being
started.
*Aug 10 18:29:40.331: %ILPM_FAULT-5-ILPM_WARNING: Warning: Ethernet Switch Network Modules
with PoE Support need to be reloaded to function properly.
*Aug 10 18:29:40.691: %SYS-5-RESTART: System restarted -- Cisco IOS Software, C2900
Software (C2900-UNIVERSALK9-M), Version 15.0(1)M2, RELEASE SOFTWARE (fc2)
This warning message is not an indication of any error in the system but a warning upon system reload
or PoE power supply restoration.
Upon PoE power supply insertion, inline power supply restores automatically in the router. After the
insertion, resets are needed for the switch modules in the router for the PoE supply to work properly.
If there are two PoE supplies, the power supplies can operate in a boost mode or redundant mode. In a
boost mode, the total power supplied is a sum of the two power supplies capacity. In a redundant mode,
if one of the PoE supply fails, the other PoE will supply power.
Cisco ISR 4451-X Power and RPS Error Messages
There are several RPS error messages unique to the Cisco ISR 4451-Xs. The messages appear on the
router console terminal.
Replacing a Fan Tray
The Cisco ISR 4451-Xs have hot-swappable fan trays that are field replaceable units (FRUs). The fan
tray includes all of the router fans in one assembly. If a fan fails, replace the tray using a flat-blade or
Phillips screwdriver.
Before Hot-Swapping a Fan Tray
Before hot-swapping a fan tray, read the safety precautions below.
• Read the entire procedure and have the required tools available.
• Do not attempt the hot-swap in ambient air temperature above 90°F (32°C).
• Do not attempt the hot-swap at an altitude above 6000 feet (1829 meters).
• When the router is being operated, it is recommended to change the fans in the Cisco ISR 4451-X
within 2 minutes to ensure the router does not overheat:
Replacing the Cisco ISR 4451-X Fan Tray
To replace the fan tray, complete the following steps: