User's Manual

Table Of Contents
Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1 191
DIB-500 R4.1 Component replacement
Replacing the top hat rail – optional (redundancy package)
11.7.1 Removing the top hat rail power supply unit
The top hat rail power supply unit is clamped on with a locking device, refer to Figure
11.11 on page 190.
Proceed as follows to remove the top hat rail power supply unit:
Preparation:
The network element must have been put out of operation temporarily, refer to sec-
tion 8.1 on page 163.
The upper cover of the equipment rack must have been removed, refer to section
5.4 on page 94.
The tools and aids must be available, refer to section 11.2.5 on page 173.
Carry out the following steps:
Risk of injury
The equipment rack features sharp edges on the inside. Risk of injury if you do not wear
protective gloves.
Always wear protective gloves for the following process steps.
Risk of electric shock
Electric shock when touching live parts. Hardware components in the equipment cabi-
net are live.
When performing work in the equipment cabinet, ensure that the voltage source on
site is switched off. This must have been checked with a voltmeter.
1. Disconnect the voltage supply cables from the top hat rail power supply unit. Us a
size 0.8 x 2.5 flat-bladed screwdriver for this purpose.
Table 11.21 Legend: Top hat rail power supply unit on the top hat rail
No. Designation
1LRU
2 Top hat rail power supply unit of the LRU
3 Terminal block