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6.8
Replacing the cooling fan
The fan unit and its controller module are inside the fan mounting assembly on
the bottom of the BTS cabinet. For maintenance, the fan unit and controller
module can be removed and replaced in the mounting assembly. The procedures
for doing this are given here.
Alternatively, the complete fan assembly can be removed and replaced. The
procedures for doing this are given in the document Nokia MetroSite EDGE Base
Station: Field Upgrade.
Note
For Nokia MetroSite BTSs with 1W TRXs, refer to Nokia MetroSite EDGE Base
Station: Field Upgrade. This document gives instructions for replacing the
VMFA type fan unit.
There are two versions of the HVMF fan unit. Version 1 has a controller module
which is fixed by tapper screws which are accessed from the top of the fan
mounting (see Figure 12). Version 2 has a controller module which can be
removed by accessing the tapper screws from the bottom of the fan mounting (see
Figure 13).
WARNING
The BTS power must be switched off before replacing the fan unit. Turn the
switch on the PSU to the stand-by position and turn off the power supply at
the main circuit breaker.
6.8.1
Replacing the HVMF cooling fan, version 1
In order to release version 1 of the fan unit's controller module, the fan assembly
mounting must be removed from the bottom of the cabinet. To do this, the cable
entry block must first be removed.
Figure 11 shows the HVMF fan assembly. For an exploded view of the fan
assembly, see Figure 12.
Releasing the cabling from the cable entry block
1.
40 (52)
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Nokia Proprietary and Confidential
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Make sure that the PSU is switched to the stand-by position and that the
power to the BTS is switched off at the main circuit breaker.
Draft
Maintenance
DN9913495
Issue 3-0 en
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Troubleshooting
