Tait TB8100 Installation And Operation Manual

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Contents

Tait TB8100 Installation And Operation Manual Manual pdf 24 page image

24 Circuit Description TB8100 Installation and Operation Manual© Tait Electronics Limited June 2005saving feature to operate. Refer to “Power Saving” on page 57 for moreinformation.Auxiliary PowerSupply This optional power supply board is mounted on the DC module. Theinput power is provided from the PA output of the HVDC circuitry on theAC converter board. It provides a high quality 13.65VDC, 27.3VDC or54.6VDC output (depending on the model) to power external accessoryequipment, or can be used to trickle-charge batteries. It can be configuredusing the Service Kit software to operate whenever mains voltage isavailable, or whenever the PA output is available.Microprocessor The microprocessor on the HVDC control card monitors and controls theoperation of the PMU. There are no manual adjustments in the PMUbecause all the calibration voltages and currents required to control andprotect the PMU are monitored by the microprocessor. The software alsoautomatically detects the PMU configuration and controls the PMUaccordingly.If any of the monitored conditions exceeds its normal range of values, themicroprocessor will generate an alarm and take appropriate action,depending on the configuration of the PMU.The alarms and diagnostic functions are accessed through I 2 C bus messageson the system control bus via the reciter, control panel and Service Kitsoftware.The operation of the cooling fan mounted on the front panel is determinedby the temperature limits set in the PMU software.Important In base station systems which use a PMU, the PMU mustbe connected to the system control bus at all times. TheI 2C current source is located in the PMU, and if the PMUis disconnected, the state of much of the bus will be unde-fined. This may cause corrupted data to be present on thebus when the reciter reads the states of the switches on thecontrol panel. This in turn may result in random actuationsof microphone PTT, carrier, or speaker key, causing theBSS to transmit or the speaker to be actuated incorrectly.2.4 Control PanelThe control panel is designed to be the link between the user and theTB8100 BSS. The circuitry for the operation of the control panel is locatedon a board mounted behind its front face. All communication between theBSS and the control panel is via the system control bus. Figure 2.5 onpage 25 shows the configuration of the main circuit blocks, and the maininputs and outputs for power, audio and control signals for the standard,dual base station, and Power Save control panels.