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Figure 7: Volume adjustment
3.6 Maintenance
The unit main cooling fan as well converters fans are to be cleaned yearly, no other maintenance needed.
3.6.1 System Testing
Back-up unit's operations are recommended to be tested at last two times / year.
3.7 Power Supply Requirements
Secondary power supply can be batteries or generator, which nominal voltage is 24 VDC. The needed current is strongly
depending on the size of the system's speaker network.
Nominal operation voltage
Input voltage range
Absolutely maximum input voltage
Minimum continuous power supply current
Maximum continuous current consumption of the system (24VDC)
32 | AlphaAnnounce Backup
24VDC
19-36VDC
48VDC
10 ADC
36ADC
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