PROTECTION SYSTEM
The Azur 340A protection system comprises of:
Overload and Short-Circuit Protection
The Azur 340A is fully protected against excessively low load impedances, taking into account the fact that a reactive load puts much more severe demands on a amplifier stage than a pure resistor.
The overload and
Over temperature detection
The instantaneous temperatures of the output devices of the Azur 340A are continuously monitored to ensure that junction temperatures do not get dangerously high. When an overtemperature condition occurs, the output is muted until the devices cool. The operation is carefully controlled to minimise the exposure of the output devices to wide temperature variations, which can impair reliability by thermal cycling. This is accomplished by making the muting periods relatively short, so the amplifier appears to be turning on and off. This puts the least stress on the output devices.
Careful definition of the protection parameters ensures that the 340A is not subject to nuisance tripping, but only closes down when the need is real. Typically this can only happen if the ventilation openings of the amplifier are obstructed while
DC offset protection
The DC offset protection system immediately isolates the amplifier from the loudspeakers by positively opening an output relay, in the unlikely event of an amplifier error. Errors of either polarity on both channels are detected.
Voltage clamping
When rapid transients are applied to reactive loads in extreme circumstances, flyback pulses can be generated which are larger than the amplifier supply rail voltages and have the potential to cause harm to the output devices. The Azur 340A has a comprehensive voltage clamping system that ensures that such pulses are safely absorbed by the amplifier and no damage can result.
12azur integrated amplifier
