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PROFESSIONAL POWER AMPLIFIERS ADVANTAGE SERIES
section SPECIAL OPERATIONS- LIMITER CONFIGURATION). The CLIP indicators
CLIP
are independent
in each channel, and indicate a real saturation, by comparing input and output continuously, and
are independent of the mains voltage.
The CLIP indicators
CLIP
also illuminates when there is an output short-circuit, whenever one
input signal is being introduced to the power amplifier.
To make the loudspeakers life longer, avoid this situation of overload during extended periods
of time.
If the input signal level is too high, don't turn the power amplifier limiter off, because it is an
efficient protection for the loudspeakers.
In general, the loudspeakers resist high peaks of instantaneous power, but when exposed to
extended saturations they lose any guarantee of good operation.
The saturation measuring circuit is sensitive to peaks; it has a quick attack time and a slow
release time.
SIGNAL INDICATORS
The SIGNAL green LEDs
SIGNAL
illuminates when the output signal of the corresponding
channel reaches 25 dBu before saturation.
These LEDs indicate signal presence in the power amplifier input.
This SIGNAL measurement circuit is sensitive to peaks; it has a quick attack time and a slow
release time to indicate the average power.
ON/PROTECT INDICATORS
The ON/PROT LED
ON/PROT
indicates the connection or disconnection of the load from the power
amplifier. These bi-colour LED ON/PROT
ON/PROT
illuminates in red when the load is disconnected
from the power amplifier and it illuminates in green when the load is connected to the power
amplifier.
Therefore, whenever this indicator is in red, will indicate us that the load is disconnected from
the power amplifier, and the power amplifier is not operative at that moment. This occurs when the
power amplifier is turned on, and when the ERROR or THERMAL protections are activated.
When the power amplifier output transistors reach 90ºC, the thermal protection circuit of the
corresponding channel is activated. The thermal protection, disconnects the load from the power
amplifier, turning red the ON/PROT LED
ON/PROT
of the corresponding channel. This only happens
under the most severe conditions of continuous overload; in such a case, it is essential to localise
and to rectify the cause of this overheating condition. The thermal protection circuit returns
automatically to its normal operation when the power amplifier output transistors drops under the
security level, connecting the load again, and turning green the ON/PROT LED
ON/PROT
.
The power amplifier load protection circuit, work when a continuous voltage appears in the
power amplifier output connectors, disconnecting the load from the power amplifier (the ON/PROT
LED
ON/PROT
of the corresponding channel illuminates on red). When the continuous voltage
disappear, the load protection circuit automatically, connects the load to the power amplifier, and
the ON/PROT LED
ON/PROT
turns green.
The power amplifier has two ON/PROT LED
ON/PROT
indicators, one per channel.
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