Figure 4-54
Panel of the PSU (AC/DC)
(1) Power LED
(2) Protection LED
(3) Fault LED
Functions
The PSU (AC/DC) performs the following functions:
l
Converts 220 V AC power into -48 V DC power and supplies -48 V DC power to the
DCDU-01.
l
Monitors the unit and reports alarms related to PSU faults (such as output overvoltage, no
output, and fan faults), alarms related to PSU protection (such as overtemperature
protection, and input overvoltage/undervoltage protection), and PSU out-of-position alarm,
if any.
LEDs
describes the LEDs on the panel of the PSU (AC/DC).
Table 4-67
LEDs on the panel of the PSU (AC/DC)
LED
Color
Status
Description
Power LED
Green
On
The power supply is
normal.
Off
There are faults (such
as no AC input, or
overvoltage and
undervoltage of AC
input) on the mains,
or the PSU has no
output.
Protection LED
Yellow
Off
The running status is
normal.
4 BTS3900 Components
BTS3900
Hardware Description
4-74
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Issue 04 (2011-02-15)