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8.5.12 EIS Control CPU
This board provides the interface between the EIS selector board and the main CPU. The secondary
CPU has an address setting which is factory set and should not be field adjusted.
Each CPU services four EIS selector boards, i.e. 16 WIP Extensions.
8.5.13 EIS Selector Board
The EIS selector board, BRDEV3EIC3-A, provides the control, audio switching, EAID and ring signal to
the WIP extension and services 4 WIP extensions.
8.5.14 Fan Module
The Fan Module is provided to draw air through the cabinet to maintain an acceptable working
temperature for all the equipment and is controlled by detecting any temperature increase in the
power supply or by receiving a signal or input from the EWS.
8.5.15 Power Supply
The Power Supply is supplied in two possible formats these are:
1.
G0012 Modular Power Supply.
The G0012 Power Supply is constructed in two sections. These are a rectifier chassis mounted on the
backpan and a regulator chassis mounted in the rack frame.
The rectifier chassis provides an unregulated DC which is then regulated by the regulator chassis to
provide 27V DC to run the system and charge the batteries. The chassis also houses the 8V regulator
required to provide the 8V DC requirement of the system.
The regulator chassis is modular in construction provides for up to four 27VDC modules, each able to
deliver 8 A. Each module is adjusted in the factory and no attempt should be made to alter these
adjustments.
2.
G0018 Power Supply.
The G0018 Power supply is used only on smaller systems and SECP's and is mounted on a chassis on
the backpan. It contains all componentry required to supply 27V to charge the batteries etc and also
provide 8V for the microprocessor circuitry. As in the case of the G0012 all voltages are factory set
and no attempt should be made to alter these settings.
3.
Power Supply Supervisory Board
This board monitors the power supply/s, the battery isolated function, power supply temperature/s
and initiates fan forced cooling as required.
MAN1813-9
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