Duncan POWERSTAGE 200, Руководство пользователя

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Protection Features
This amplifier has several features designed protect it under worst case conditions.
POWER AMP CLIP / OVER-CURRENT / OVER-TEMPERATURE INDICATOR
This LED serves multiple purposes, indicating the following:
• Power Amp voltage clipping
• Power Amp current limiting
• Power Amp over-temperature warning
LIGHTING OF THIS INDICATOR CAN BE CAUSED BY THE FOLLOWING:
• Shorted speaker cable
• Speaker voice coil shorted to speaker pole piece or frame.
• or – output signal connected to Ground.
• Total speaker impedance (parallel combination of speakers/cabinets) in excess of
maximum rating.
• Level control set too high.
• Internal fault. Contact manufacturer for repairs.
OVER TEMPERATURE PROTECTION: The over-temperature circuit monitors
the temperature in the output stage and power supply. As the temperature in
either approaches 125°C, the Pwr Amp Clip/O.C. indicator will light continuously.
When the temperature reaches 150°C, the amplifier will shut down until the
temperature drops below 120°C, at which point it will reset.
Lighting of the “Temp” indicator can be caused by the following:
• Lack of air circulation around amplifier.
• Blocked vents.
• Blocked or stopped cooling fan.
• Excessively high ambient temperatures.
• Heavy loading of output (low impedance loads) coupled with high power
demand.
• Combinations of any or all the above.
PREAMP CLIP / STATUS INDICATOR
This LED also serves multiple purposes, indicating the following.
• Preamp voltage clip warning – the LED will begin to light when the input signal
is 6dB below the level of clipping. You should adjust the output level of the audio
device directly feeding the PS200 so that this LED flashes on signal peaks.
• Protect Status of the power supply/power amp module – when lit continuously,
the amplifier has shut itself down and entered protect mode due to potentially
destructive overload conditions. In these cases, the amplifier will typically resume
operation after a short delay or after the overload condition has been eliminated.
Some causes are:
• Severe overcurrent conditions and/or a short circuit on the speaker output.
• Over-temperature conditions due to heavy loading at high output levels.
• Over-temperature conditions due to inadequate air flow or excessively high
ambient temperatures.
• Internal fault. Contact manufacturer for repairs.
Tone Control Response
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