Tait TB9400 Installation And Operation Manual

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Tait TB9400 Installation And Operation Manual Manual pdf 23 page image

DRAFT 4TB9400 Installation and Operation Manual Description 23© Tait Electronics Limited September 20111.7.4 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 can triggeralarms that are sent to the reciter. Alarms can be monitored via the webinterface, and are also recorded in the reciter’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 the ACsupply becomes unavailable, a seamless changeover from the AC to DCsupply takes place, providing that the battery voltage is above the configuredminimum. You can use a web browser to check whether the base station isrunning 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 PMU microprocessor,while the rest of the PMU is shut down. When the battery voltage rises tothe configured startup setting, power is resumed to the DC supply. Refer to“PMU Operation on DC Input” on page 25 for more detailed information.Auxiliary PowerControl The output from the auxiliary power supply board can be used to powerother site equipment. The maximum output is 40 W.Distribution Figure 1.8 shows how power is distributed to modules in the subrack. The28 VDC output from the PMU is fed directly to the 100 W PA and 50 WPA1, and to the other modules via the subrack interconnect board. Powerto the reciters and front panel is current-limited by self-resetting fuses on thesubrack 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.