36 Description TB9300 Installation and Operation Manual
© Tait International Limited April 2024
1.8.6 Front Panel Fans
The front panel is equipped with three fans. The first is for the reciters, the
second is for the PAs, and the third is for the PMU. Front panel fans do not
operate continuously, but are switched on and off as needed by their
associated module. In a dual base station either PA or reciter can turn on its
fan. The reciter in slot 1 can also carry out a fan test on all three fans.
Front panel fans are 3-wire fans (power, ground, and rotation detect). The
reciter can monitor whether the fans are rotating and generate an alarm if
any of the fans fail.
The fans turn on for the duration of time the base station takes to boot
from power up. The fans also turn on for a few seconds after the front
panel is refitted to a base station that is powered up.
Configuring Fan
Control
The operation of the PA fan is configurable via the WebUI; you can specify
the threshold temperature at which the fan will be turned on, and set the fan
to operate only when the PA is transmitting.
Notice If a fan is not operational, the fan alarm will only be raised
when the fan is turned on, not at system start-up. To avoid discovering
a fan fault after leaving the site, Tait recommends running a diagnostics
fan test.
The PMU fan has fixed on/off thresholds and a defined set of duty cycles
based on the PMU temperature and load current, as described in the
following table.
PMU Temperature Current Fan Duty Cycle
<149°F (65°C) <4A
4A–6A
6A–8A
8A–12A
12A–14A
15A
always off
2 minutes on, 8 minutes off
2 minutes on, 5 minutes off
3 minutes on, 3 minutes off
4 minutes on, 1 minute off
always on
>149°F (65°C) –– always on
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