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TP48200A-HX09A3, TP48200A-HX09A4,
TBC300A-DCA3, TBC300A-DCA5 and
TBC300A-TCA2 Telecom Power
User Manual
Figure 3-24 TCUA
(1) Power input port
(4) Switch port (reserved)
(7) Indicator
(10) Temperature signal
port 1
(13) Internal circulation fan
port 2
TEC Working Principle
The TEC cools and heats air through internal and external circulation. Table 3-14 describes
how the TEC works. Figure 3-25 shows the TEC airflow directions.
Table 3-14 TEC working principles
Function
Cooling
Issue 04 (2019-11-15)
Working Principle
The TCUA control box controls the refrigeration chip in the TEC module to cool the
internal circulating air. The internal circulation fan draws the air inside the battery
compartment into the internal circulation heat sink. The internal circulation heat sink
cools the air and then returns the cooled air to the battery compartment through the air
exhaust vents. Meantime, the external circulation fan draws natural air into the external
Copyright © Huawei Technologies Co., Ltd.
(2) External circulation fan
port 1
(5) Door status sensor port
(8) Communications port 1
(11) TEC air conditioner
port
(14) Temperature signal port
2
3 Components
(3) External circulation fan
port 2
(6) Electronic label port
(reserved)
(9) Communications port 2
(12) Internal circulation fan
port 1
44
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