3com 8800 User Manual

AC power input is accessed from the front of the unit. AC power cord connection is 
made using power cords with IEC 60320 C-19 connector plugs. The AC power plugs 
are labeled Input 1, Input 2, and Input 3, which correspond to the power supply 
modules numbered from left to right. Refer to Figure 12.

To connect AC power: 

1 Turn the AC branch circuit breakers to the "OFF" position.

2 Ensure that the AC input switches are in the "OFF" position. 

Plug the AC input power cord(s) into the AC socket(s) that correspond to the power 
supply module slot location(s). For example, the C20 coupler labeled "Input1" 
corresponds to the power supply module in the furthest left power supply module 
slot, when viewing the PoE Power Rack from the front. 

DC and AC Connections

Verify that all AC branch circuit breakers and PoE Power Rack AC power switches are 
in the "OFF" position. 

1 Ensure that all power supply modules are seated and locked into position in the PoE 

Power Rack. 

2 Turn the AC branch circuit breakers to the "ON" position. 

3 Turn the PoE Power Rack AC power switches to the "ON" position (corresponding to 

the power supply modules installed). 

4 Verify that the "AC OK", "DC OK", and green LEDs are on.

5 Verify the fan is operating on each power supply module. 

6 Wait approximately 10-30 seconds to allow the switch system to go through its 

start-up procedure. 

7 Verify that the green LED on the controller panel is on. 

8 Use a digital voltmeter to verify that the DC output voltage is approximately -54VDC.

9 For systems with more than one power supply module installed, turn one of the AC 

power input switches to "OFF" to verify that the red alarm LED lights on the PoE 
Power Rack controller. 

10 For systems with more than one power supply module installed, turn the second AC 

input switch off to verify that the FAULT LED lights on the controller. Clear the alarms 
by turning on the AC input switch.