Tait TB9400 Installation And Operation Manual

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Tait TB9400 Installation And Operation Manual Manual pdf 25 page image

DRAFT 4TB9400 Installation and Operation Manual Description 25© Tait Electronics Limited September 20111.7.5 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 limitsThe voltage range for each of these parameters is provided in Table 1.1 onpage 26. Figure 1.9 on page 27 illustrates how these parameters interact, andhow 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(Configure > Alarms > Thresholds). The alarms will be triggered when theset voltage levels are reached. These limits are subject to the tolerances of thebattery protection circuitry, as stated in “Battery Protection (Fail-safe)Limits” in Table 1.1.Startup andShutdown Limits The user-programmable startup and shutdown limits allow for adjustablestartup and shutdown voltages (Configure > Base Station > Miscellaneous).These limits can be adjusted for different numbers of battery cells, or for theparticular requirements of the base station operation. Once the limits arereached, the PMU will shut down. These limits are subject to the tolerancesof the battery protection circuitry, as stated in “Battery Protection (Fail-safe)Limits” in Table 1.1.Important It is possible to set the startup voltage of the base stationbelow the nominal voltage of the battery. Continuing to usea battery for extended periods when it is below its nominalvoltage will severely shorten its service life. For more infor-mation on battery management, we recommend that youconsult the battery manufacturer.Battery ProtectionLimits The battery protection limits are set in hardware at the factory, and cannotbe adjusted by the user. These limits will not be reached under normaloperation conditions, but are provided as “fail-safe” measures to protect thebattery from deep discharge. They also remove the need for low-voltagedisconnect modules.