Tait International Limited TBCK4B Manual Do Utilizador

TB9400 Installation and Operation Manual

© Tait Electronics Limited September 2011

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 50 W base station, or for the 
PA and reciter in a 100 W base station. Front panel fans do not operate 
continuously but are switched on and off as needed by the reciter firmware. 
Each reciter controls the fan it shares with its PA, and reciter 1 also controls 
the PMU fan. Under certain conditions the PMU and each PA can override 
the reciter and assume control of its own fan.

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, as described in the following table:

<149 °F  (65 °C)

Increases  as the load on the PMU 
increases

149-167 °F (65-75 °C)

On for two minutes, off for one minute

>167 °F (75 °C)

Always on