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User Guide
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Hot-Swappable Power Supply Features
This hot-swappable power supply consists of two independent modules.
It can function properly with only one module.
However, if two modules are fitted, if one of the power modules should fail, the other
one will supply power to the system until you can change the failed module. The failed
module can be hot-swapped.
Note: Connect both power modules to power outlets to
ensure continuous operation.
When a power module is operating normally, the LED is lit green. Should it fail (or the
power module switched off, or unplugged), a buzzer will sound, and the LED will turn
off. Press the
Fan Failure, Overheat and Power Supply Failure button ( see “Front
View with Front Bezel” on page 73 ) on the front panel to turn off the alarm.
Power Supply LEDs
There are two LEDs on the back of the power supply. Refer to the table below for more
information.
The PSU is protected against over-temperature conditions that may be caused by a
reduction of the fan cooling or an excessive ambient temperature. In OTP mode, the
power supply unit will eventually shut down.
Table 7: Power Supply LEDs
Power Supply Condition Status LED
(AC OK /
Power Sup-
ply Fail) Power LED
(Power
Good) Remarks
AC Power Off OFF OFF
AC Power On in Standby Green OFF
AC ON and all outputs in
Normal Green Green
Any DC outputs in short
circuit Green OFF Power distribution
module board only.
Module OK.
DC Fan not spinning Amber OFF Module protection
only
Over-Temperature Protec-
tion (OTP) Amber Green Send out alert signal