CPA240 Configurable Power Amplifier
Page 32 of 35
21031 CPA240 manual V1.31.doc
10.2 Safety Considerations for System Maintenance
Only a qualified and trained electronics engineer should be permitted to make any type
of adjustment or repair to the Public Address or Voice Alarm System.
The following safety factors should be considered before attempting to maintain or repair the
CPA240.
•
Electrical
•
Heat
•
Weight
During the maintenance process all protective covers must be inspected for damage and
correct fitment.
10.2.1 Safety and Electrical Rating Information
Information regarding fuse ratings and voltage requirements is provided on the top cover of the
amplifier.
The location of high voltage terminals is indicated via British Standard high voltage flash marks
on the amplifier chassis.
10.2.2 Electrical Hazards
High Voltages exist within this apparatus:
•
230V mains
•
100V signals
The CPA240 primary supply is 230v AC 50-60Hz. This is connected by means of an IEC fused
inlet.
This equipment does not include a mains isolation switch therefore the:
Mains (and battery supply where fitted) must be disconnected from the apparatus before
any part of the casing is removed.
Mains and other high voltages can be exposed if internal covers are removed.
100V signals are present both inside the amplifier and at the 100V line output connector.
Adequate precautions must be exercised when working on or around the amplifiers,
associated output cabling and terminals.
Battery Backup:
Where the CPA240 has a secondary supply i.e. 24Volt battery backup:
The battery supply must be also be disconnected before any part of the casing is
removed.
10.2.3 Heat Hazards.
During normal operation there is a potential temperature hazard in the centre section (heatsink)
of the amplifier frame. The CPA240 power amplifier heat sinks can become Very Hot.
This heat can also be conducted through the chassis and other parts.
Heat build-up generally occurs when alarms and other high level signals have been broadcast
for a long period of time. Heat build-up may also occur if the amplifier is faulty.
Warning: The amplifier heatsink can reach temperatures of up to 80°C
10.2.4 Weight Hazards.
