Ashly FA-250.4 Manual de instruções - Página 6
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FA Amplifier • Operating Manual
•
FA-1.2RM kit (sold separately): For
installing one or two half-rack units into a
19" equipment rack:
•
FA-2.2RPM kit (sold separately): For adding
additional rear rack support for touring or
mobile applications:
Use all four screws when mounting the
amplifier to the front rack rails. In some
installations where the sound system is
exposed to a high level of RF noise or system-
induced oscillation, it may be necessary to
ground the amplifier's chassis to the rack
enclosure. This is accomplished using star type
lockwashers on the four rack mounting screws,
placed between the amplifier chassis and the
rack rails. These star washers will penetrate
through the amplifier and rack rail finish to
adequately ground the chassis to the rack.
2.6
Cooling
Air vents on the amplifier rear panel must have
access to free flowing room temperature air
between 32°F and 104°F (0°C-40°C). Air is
drawn in through the side and blown out the
back. It is not necessary to leave empty rack
spaces above or below the amplifier. See the
specifications section for amplifier thermal
output characteristics in BTU/hour.
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Amplifier Protection
Thermal Protection - Thermal protection will
engage at an internal estimated component
temperature of 185°F (85°C). The amplifier will
mute and maintain that state until the internal
estimated component temperature drops
below 176°F (80°C).
Overpower Protection - Overloading the unit's
output will cause the DSP to limit the signal.
Once the amplifier is no longer signaling an
overload, the DSP will slowly increase the
volume back to the desired level. Continuously
overloading the output will ultimately cause
a "pumping" sound, which will give a reduced
listening experience, but isn't harmful for the
amplifier. Note that long-term overload of the
output may cause the thermal protection to
engage.
Output DC and Rail Fault Protection – If DC
is detected on the output, the amplifier will
mute for a brief period and then try to resume a
normal state. The amplifier will cycle this a total
of 3 times, but if a DC is still present, the power
supply turns off and latches, requiring a power
cycle or removal of the AC cord to reset the
protection circuitry.
AC Mains voltage - The amplifier should
always be used in its intended voltage range
of 100-240 VAC and may never exceed
the approved safety limits of 85-265 VAC.
Minimum startup voltage is 85VAC. A fail-safe
shutdown circuit engages at 290VAC, however
the amplifier may be damaged and require
servicing if the mains voltage exceeds 265VAC.
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