8.5.16 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.
Figure 16: Power Supply Supervisory Board Layout
8.5.17 Fault Relay
The EV3000 has a fault relay which is normally operated. Should a fault occur in the EV3000 the
relay releases and the Warning System output of the FireFinder recognises and responds to the
fault.
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