Ashly PowerFlex 670 Bedieningshandleiding - Pagina 10

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Operating Manual - Powerflex Multi-Channel 70V Power Amplifier
An AC power interruption will result in all chan-
nels entering protect mode simultaneously, just as if the
amplifier is being turned off.
In all cases, the amplifier will restart the signal
processing module after a short delay and will reconnect
the speakers after several seconds if no further fault con-
ditions exist. This allows the servo circuitry to bring any
residual DC offsets to zero before speakers are connected.
Specific conditions resulting in a fault are as follows:
8.1 Power supply undervoltage - Possible causes
would be total load on the outputs exceeding recommen-
dations (remove some speakers), low AC mains voltage
(reduce extension cord length or increase wire size, or
switch to an AC mains circuit more capable of supporting
the amplifier's power requirements), or improper AC inlet
mains voltage setting (make sure nominal AC mains volt-
age matches the number in the viewing window on the AC
inlet).
8.2 Power supply overvoltage - Possible causes
would be high AC mains voltage (change to an AC mains
circuit with voltage within the amplifier's stated require-
ments) or improper AC inlet mains voltage setting (make
sure nominal AC mains voltage matches the number in the
viewing window on the AC inlet).
8.3 Output overcurrent - more than 7 amperes
being drawn from any output. Possible causes would be
total load on the affected output exceeding recommenda-
tions (disconnect some speakers), or a short circuit on one
of the outputs driven by the affected module (inspect
speaker wiring for proper connection).
The above conditions are checked by the signal
processing module on a switching cycle by switching cycle
basis and are therefore monitored as often as a million or
more times a second, allowing protection well before de-
structive conditions have time to cause part failure.
10
8.4 Heat sink overtemperature - a measured heat
sink extrusion temperature of more than 85 to 90 degrees
C. The two-speed fan will switch to high speed at a tem-
perature of 70 to 75 degrees C. The overtemperature fault
will clear itself when the measured temperature is below
about 70 degrees C. The fan will operate at low speed
below about 50 degrees C.
8.5 Unacceptable DC or high frequency output
content - a DC offset in the output signal of more than a
few hundred millivolts indicates module failure, and will
trigger a DC protect fault. High frequency (above 20kHz)
in the output at high amplitudes can cause speaker dam-
age and will trigger a HF protect fault.
These two conditions (DC and HF) are tested by
the same circuit so the exact cause cannot be isolated. If
the fault condition persists after disconnecting all inputs
and outputs from the amplifier, there is probably a module
failure requiring service. Note: the self-testing circuit may
take as long as 30 seconds to recover from this fault, so be
sure to give the amplifier enough time to reset itself. If
after 30 seconds the module has recovered, begin plug-
ging in one input and output at a time in an effort to iso-
late a system high-frequency or oscillation problem.
8.6 AC power interruption - a dropout (or brown-
out of sufficient magnitude) of more than one half mains
line cycle and less than one whole cycle in duration.
9.

TYPICAL APPLICATIONS

The Powerflex 670 is essentially three stereo am-
plifiers in one chassis, each with Independent, Parallel, and
Bridge mode, while the Powerflex 470 is two stereo am-
plifiers (four channels), but with more power per channel
than the 670. Note: The Powerflex 670 is used for the
following application details, but the 470 is used in a simi-
lar fashion, to a maximum of four channels.