User's Manual

3 Functional Description
Page 23
3.2.6. PSU Drawer
The power supply module is equipped with an IEC
power connector for mains supply and a Status
alarm LED.
Always disconnect the mains connector
switch the PSU module off before removing it!
The Status LED shows a green light during
normal error-free operation.
The Status LED shows a red light when there is a
power-supply failure.
The Fan LED shows a red light when a fan alarm
is raised due to a fan failure.
The Red. [Redundany mode] LED shows green
light if redundancy mode is configured. It never
shows a red light.
figure 3-10 PSU drawer
figure 3-11 I
2
C switch located on the PSU board
Positions possible of I
2
C bus switch:
Non-redundant
configuration
Redundant configuration
1 RU & 1 EU in 1 subrack 2 RUs in 1 subrack 2 RUs in 2 subracks
A = Main RU A = RU 1 A = Main RU
B = EU
or
B = RU 2
or
B = Substitute RU
table 3-2 I
2
C bus switch on PSU module, rear side
I2C bus
switch
Red. mode
Status
Fan
1. 2.
Mains connector –
DISCONNECT!