Cooling; Replacing The Cooling Fans; Figure 188: Mts 4 Airflow - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

Figure 188: MTS 4 Airflow

12.2.4

Cooling

Natural convection cooling is applied. For example there is no fan when MTS 2 operates with a load of
295W for 2 BRs, low power PA, plus a charge current of 3 A at + 30 °C.
Forced air from fans placed below units is used when for example MTS 4 operates with a load of 640W
for MTS 4 with 2 BRs, MTCC, high power PA plus a charge current of 6 A at + 30 °C.
For all configurations of MTS, see
Expansion Cabinet 400 MHz BR-Arch-1 Configuration on page 78
12.3

Replacing the Cooling Fans

Procedure:
1 WARNING: When unplugging the connector from the PSU, wait a few second for the
fans to stop.
Open the housing of the cabinet of MTS and unplug the connector from the PSU.
Cool air intake
for top cardcage
front and back
Separating plate
guides air from
bottom cardacge
to sides
Air intake all sides
Table 13: Typical Power Loads and Heat Dissipation Values –
6802800U74-AN
Chapter 12: Cooling Fans
Heated air flow
from both card
cages in both
sides of cabinet
Air exhaust
from bottom
cardcage
into sides
of cabinet
Cool air for top
cardcage flow
in front and
behind bottom
cardcage
343