Tait TB9400 Installation And Operation Manual

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Tait TB9400 Installation And Operation Manual Manual pdf 26 page image

26 Description TB9400 Installation and Operation Manual© Tait Limited March 20171.7.4 Power Management and DistributionThe PMU manages the supply of power to ensure uninterrupted operationof the base station. A range of parameters is monitored and these cantrigger alarms that are sent to the reciter. Alarms can be monitored via theweb interface and reported via SNMP traps; they are also recorded in thereciter’s internal log file.AC to DCChangeover When the PMU has an AC and a DC module, the base station can bepowered by either the AC (mains) or the DC (battery) supply. The basestation will default to the AC supply if both supplies are provided. If theAC supply becomes unavailable, a seamless changeover from the AC toDC supply takes place, providing that the battery voltage is above theconfigured minimum startup voltage. You can use a web browser to checkwhether the base station is running on battery 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 batteryprotection mode to protect the battery and base station equipment. Thestandby power supply card maintains the power to the PMUmicroprocessor, while the rest of the PMU is shut down. When the batteryvoltage rises to the configured startup setting, power is resumed to the DCsupply. Refer to “PMU Operation on DC Input” on page 28 for moredetailed information.Auxiliary PowerControl The output from the auxiliary power supply board can be used to powerother site equipment. The maximum output is 40W.Distribution Figure 1.8 shows how power is distributed to modules in the subrack. The28VDC output from the PMU is fed directly to the PA in a single basestation, or directly to PA 1 in a dual base station, and to the other modulesvia the subrack interconnect board. Power to the reciters and front panel iscurrent-limited by self-resetting fuses on the subrack board.The AC converter has a series switch which breaks the phase input to theconverter. The DC input, however, has much higher current ratings. Itsswitch does not disconnect power from the DC converter itself, but disablesthe converter by switching off its control circuitry.The outputs from both the AC and DC high power converters are addedtogether and fed to the modules via the high-current outputs. The auxiliaryoutput is also tapped off this summed output.