Tait TB8100 Installation And Operation Manual

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Tait TB8100 Installation And Operation Manual Manual pdf 51 page image

TB8100 Installation and Operation Manual Functional Description 51© Tait Electronics Limited June 2005Reciter PowerControl Signals The power control signals PWD_EX, PWD_RX and PWR_ON (refer toFigure 4.9 on page 67) are control lines internal to the reciter that originatefrom the DSP on the digital board and are distributed to the RF and systeminterface boards. These lines allow the power control software to selectivelyturn on or off different reciter circuit blocks depending on the depth ofpower savings configured.PWD_EX controls the circuitry associated with the exciter RF path, suchas the exciter buffer amplifier, VCO and synthesizer.PWD_RX controls the circuitry associated with the receiver RF path, suchas the receiver VCO and synthesizer.PWR_ON turns off all non-critical control logic that is not required tomaintain a minimum level of RISC and DSP activity. This ensures a timedpower-up and activity cycling process. The RF and system interface boardare shut down completely.4.5 PMU Operation on DC InputThe operation of the PMU on DC input is controlled by three sets ofparameters: user-programmable alarms user-programmable startup and shutdown limits battery protection limits.The voltage range for each of these parameters is provided in Table 4.1 onpage 53. Figure 4.6 on page 52 illustrates how these parameters interact,and how they control the operation of the PMU over a range of DC inputvoltages.Alarms User-programmable alarms can be set for low or high battery voltage. Thealarms will be triggered when the set voltage levels are reached.To set the alarms, run the Service Kit and select Configure > Alarms >Thresholds. In the Thresholds form, enter the required minimum andmaximum values in the PMU battery voltage fields.Startup andShutdown Limits The user-programmable startup and shutdown limits allow for adjustablestartup and shutdown voltages. These limits can be adjusted for differentnumbers of battery cells, or for the particular requirements of the basestation operation. Once the limits are reached, the PMU will shutdown.To set the startup and shutdown limits, run the Service Kit and selectConfigure > Base Station > Miscellaneous. In the Power Configurationarea, enter the required values in the Power shutdown voltage andPower startup voltage fields.