Tait TB9100 Installation And Operation Manual

Also see for P25 CG: Installation and operation manual User manual

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Tait TB9100 Installation And Operation Manual Manual pdf 24 page image

24 Description TB9100/P25 CG Installation and Operation Manual© Tait Electronics Limited January 2007Power ManagementTB9100 base stations with a PMU manage the supply of power to ensureuninterrupted operation of the base station. A range of parameters ismonitored and can trigger alarms that are sent via the reciter to the CSS anda syslog collector.AC to DCChangeover When the PMU has an AC and a DC module, the TB9100 can be poweredby either the AC (mains) or the DC (battery) supply. The base station willdefault to the AC supply if both supplies are provided. If the AC supplybecomes unavailable, a seamless changeover from the AC to DC supply takesplace, providing that the battery voltage is above the configured minimum.You can use the CSS to monitor whether the base station is running onbattery or mains power.DC Operation When the base station is running off the DC supply and the battery voltagefalls below the configured minimum, the base station will enter PMUShutdown mode to protect the battery and base station equipment. Astandby power supply card is required to maintain the power to the PMUmicroprocessor, while the rest of the PMU is shut down.When the battery voltage rises to the configured startup setting, power isresumed to the DC supply.Auxiliary PowerControl If the PMU is fitted with an auxiliary power supply unit, its output can beused to power other site equipment or to recharge the DC battery supplywhen the base station is running off the AC supply. You will need toconfigure it to suit your requirements.Power DistributionFigure 1.6 shows how power is distributed to modules in the subrack. Onemethod is used if there is a PMU, another if there is a 12 V PA and yetanother if there is neither PMU nor PA.Subracks with aPMU The TB9100 can receive input power from either the AC or DC input. ThePMU provides a 28 V output to the PA and to the reciters. Internal seamlessswitching between the AC or DC input ensures there are no powerinterruptions should a changeover occur between the two inputs. The basestation will default to the AC input if both AC and DC inputs are provided.The AC converter has a series switch which isolates the mains input fromthe converter. The DC input, however, has much higher current ratings, andsupports an on/off switch on the converter only.The outputs from both the AC and DC high power converters are addedtogether and fed to the PA via the PA1 and PA2 outputs. The auxiliaryoutput is also tapped off this summed output.