Ashly PowerFlex 670 Bedieningshandleiding - Pagina 6

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Operating Manual - Powerflex Multi-Channel 70V Power Amplifier

FRONT PANEL INDICATORS

6.1

Power Switch

When the unit is switched on there is a five sec-

ond delay, during which time the PROTECT circuit will

activate, disconnecting the speakers from the amplifier out-

put. When turning off the amplifier, the load is removed

instantly, and the protect LED will briefly turn on as the

power supply discharges.

6.2

Signal Indicator

The signal present LEDs illuminate at an input

level of about 14mVrms (-35dBu).

6.3

Clipping Indicator

The clipping LEDs illuminate at an input level of

about 870mVrms (+1.0dBu), with all channels driven by

1KHz into rated load. This indicates that the signal pro-

cessing circuitry has determined output levels to be ap-

proaching the available power supply rails and has begun

to "soften" signal peaks. Actual onset of "hard" clipping

depends on audio program and total load impedance and

does not occur until the signal processing circuitry can no

longer compensate, which means that signal integrity can

be maintained even if the clipping indicators illuminate

for short periods of time.

6.4

Thermal Status Indicator

The thermal LEDs illuminate when the tempera-

ture of any one of the heat sink extrusions reaches 85° to

90°C. Both channels of the affected amplifier module will

Channel 1

Channel 2

Channel 3

Protect

Thermal

Clip

Signal

Channel 4

Channel 5

Channel 6

shut off until the measured temperature drops below about

70°C. The amplifier should be able to maintain proper

operation at an ambient room temperature of 50°C (122°F)

or less with typical audio program and all channels driven

into rated loads.

6.5

Protect Indicator

The protect LEDs illuminate when the fault moni-

toring microprocessor has determined that one of the fol-

lowing conditions exists:

- Power supply undervoltage

- Power supply overvoltage

- Output overcurrent

- Heat sink overtemperature

- Unacceptable DC output content

- Unacceptable high frequency output content

- AC power interruption

Because the signal processing module used in

Powerflex amplifiers processes two channels simulta-

neously, a fault in one channel will result in a protect con-

dition for both channels processed by the same module,

ex. channels 1-2, 3-4, and 5-6 (670 only). Thus there will

never be a case where only one of the amplifier channels

is shown in protect mode. When a pair of protect LED's

are illuminated, internal relays have removed the channel

pair's speaker loads from the amplifier output and con-

nected the speakers to ground. If the fault is isolated to

one module (channel pair), the other channels will remain

unaffected.

Powerflex

Power

670