TP48200A-HT15D3 Telecom Power (Russia, Megafon)
User Manual
3 Components
Issue 03 (2019-11-15)
Copyright © Huawei Technologies Co., Ltd.
34
Figure 3-14
TCUA
(1) Power input port
(2) External circulation fan
port 1
(3) External circulation fan
port 2
(4) Boolean value port
(reserved)
(5) Door status sensor port
(6) E-label port (reserved)
(7) Indicator
(8) Communications port 1
(9) Communications port 2
(10) Temperature sensor
port 1
(11) TEC port
(12) Internal circulation fan
port 1
(13) Internal circulation fan
port 2
(14) Temperature sensor
port 2
TEC Working Principle
The TEC cools and heats air over internal and external air circulation. Table 3-13 shows the
TEC working principle. Figure 3-15 shows TEC airflow directions.
Table 3-13
TEC working principle
Function
Working Principle
Cooling
The TCUA controls the TEC04C to cool the internal circulation air. The internal fan
draws the hot air inside the battery compartment into the internal heat sink. The internal
heat sink cools the air and then returns the cooled air to the battery compartment from
the air exhaust vent. At the same time, the external circulation fan draws the external
circulation air into the external heat sink to accelerate the airflow. The air absorbs the