CPA240 Configurable Power Amplifier
Page 26 of 35
21031 CPA240 manual V1.31.doc
7 Fault Monitoring Features
Audix offers the opportunity to monitor the critical audio path of public address and voice alarm
systems.
This monitoring is carried out using the Fault Monitoring System or ‘FMS’.
The FMS system offers a wide range of monitoring options:
•
Audio path.
•
Serial data link.
•
Control contacts.
•
Amplifier.
•
Mains and battery supplies
Voice alarm systems that comply with BS5839 Part 8 1998 require all of the above to be
monitored on critical paths and components. Critical paths are those paths through the voice
alarm system that rely on equipment and the connections between them to achieve a voice
alarm broadcast.
As the CPA240 amplifier forms a major part of this path it is therefore a critical component and
must be monitored.
Note: If a voice alarm system is to comply with BS5839 Part 8 1998 and any other
standard it must be specifically designed to achieve that end.
7.1 Supply Monitoring
The amplifier provides fault monitoring of the primary and secondary power supplies.
•
Mains
•
Backup supply (24V DC Battery)
Indication of supply failure is in the form of the following front panel LEDs
•
Mains supply failure
•
Battery supply low voltage/failure
•
Charger failure (fault signal from external charger)
Detection of these faults are repeated to the FMS unit.
Indication that ‘power’ is present from either of the supplies is in the form of a green ‘power on’
LED.
7.2 Amplifier Monitoring
Further to the supply monitoring the CPA240 provides the following fault monitoring:
•
Each power stage
•
Over temperature
The power stage monitoring detects the failure of critical power devices by measuring current
flow.
Should this ‘current flow’ be interrupted for more than 100 seconds a channel ‘fail’ will be
displayed on the front panel.
The over temperature indicator denotes that the amplifier has been shut down due to excessive
heat in the power block heatsink.
