3Com 7750 Series User Manual - Page 6

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3Com 7750 Series User Manual
PoE Power Rack Installation Guide
Condition
AC not present in any power supply module
Boost stage Failure
Over Voltage Latched shutdown
Over current
Any internal failure
The Front panel of the power supply module is as follows.
Figure 2-2 (3C16884) Power Supply Module front panel

System Controller

The PoE Power Rack has a system controller at the rear of the chassis. See figure 2-3.
Figure 2-3 Front panel of the controller
A green LED (RUN) and red LED (ALM) to indicate operational and alarm status are located on the front panel
of the PoE Power Rack controller. When the system has an alarm, such as input failure, input over-voltage or
under-voltage, output over-voltage or under-voltage, power supply failure, power supply self-protection, the red
(ALM) LED will light. Once the alarm status is cleared, the LED go off.
The controller of the Poe Power Rack has two major functions:
Monitoring the system operation status — Inside PoE Power Rack there is an AC sensor card which
samples the AC input voltage. The sampled signal is sent to the controller for processing. If the AC input
voltage is lower than the pre-set alarm level, the controller reports an AC input under-voltage alarm.
AC OK (green)
0
0
1
0
1
0
1
0
1
0
2-2
Chapter 2 System Description
DC OK (green)
0
1
1
0
1
Fault (Red)