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TB9400 Installation and Operation Manual

© Tait Limited March 2015

The front panel is equipped with three fans. One fan is for the PMU and the 
other two are for the reciter/PA pairs in a 50W base station, or for the PA 
and reciter in a 100W base station. Front panel fans do not operate 
continuously, but are switched on and off as needed. The PMU and PA 
control their own fan. Reciters request the front panel to turn on their fan. 
The reciter in slot 1can 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 
the fan fails.

The fans turn on for a few seconds when the base station is powered up, and 
also after the front panel is refitted to a base station which is powered up. 

The operation of the PA fan is configurable via the web interface; 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.

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.

<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