68
•
PSU LED
Color
Description
The system is connected to the power source but the system is not turned on.
The PSU is operating normally.
The PSU is faulty.
The PSU LED alerts you of the current status of your PSU and cooling module components.
When either of the components fails, you must replace the PSU/cooling module immediately.
WARNING!
Keep your fingers away from moving parts of the system to prevent technical
mishaps and physical injuries.
NOTE:
For more details see section
Replacing the PSU/Cooling Module
.
Alarms and I
2
C Bus
This section details the system alarms and I
2
C bus.
Audible Alarms
You will hear an audible alarm if any of the following components fails:
•
Cooling Module
•
PSU Modules
•
Hard Disk Drives
•
Sensors or Presence Detection Circuitries
If you hear an audible alarm, ensure to read the error message on the terminal or the PAC
Management Software screen to determine the cause of the alarm. Take appropriate actions to
solve the problem. You can turn off the alarm using the mute button on the front panel. To know
more of the alarm beep patterns, see the Troubleshooting Guide included in the bundled CD.
NOTE:
When the temperature exceeds the preset threshold, the controller’s charger circuits stop
charging. You will receive a message that says
Thermal Shutdown/Enter Sleep Mode
. When the
temperature falls back to normal range, the battery resumes charging.
I
2
C Bus
The operating status of the PSU and cooling fan modules are collected via the I
2
C serial bus. If
either of the modules fails, the system detects the failure and you will be notified via the same
methods stated in audible alarms.
