3com 8800 Benutzerhandbuch

This section provides field maintenance information and troubleshooting procedures 
for the PoE Power Rack and power supply modules. Review the safety information in 
section 3 of this manual before performing maintenance procedures 

The power supply modules are not field serviceable and must be replaced in the event 
of a failure. 

Use Table 6 to determine if there is a fault with PoE Power Rack. 

When visual indicators do not identify a defective part, notify your authorized service 
representative. 

Table 6   Troubleshooting Guide

RUNALM

NONE

■

The AC power input 
circuit breakers has 
opened.

■

AC input voltage is too 
low or power is lost

1 Verify that AC 

power input 
circuit breaker is 
closed; close 
circuit breaker if 
it is open.

2 Verify the AC 

power is present 
and in normal 
range.

RUNALM

AC OKFAULT

■

Power supply module 
failure

■

Output beyond normal 
range

Replace the power 
supply module

RUNALM

AC OKDC 
OKFAULT

Communication error 
between the power supply 
module and the controller

Replace the power 
supply module

RUNALM

AC OK

■

Power supply module has 
no output and it is in 
standby mode

■

Over load

■

Ambient temperature is 
too high

■

Power supply module 
failure;

1 Initialize the 

power supply 
module or reset 
the controller.

2 Check if the load 

is over the 
rating.

3 Check the 

ambient 
temperature.

4 Replace the 

power supply 
module