Ashly TRA-4150 Operating Manual - Page 6

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Operating Manual - Powerflex Multi-Channel 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

output. 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 13mVrms (-35.5dBu).

6.3

Clipping Indicator

The clipping LEDs illuminate at an input level of

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

1KHz into 8 . This indicates that the signal processing

circuitry has determined output levels to be approaching

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 oc-

cur until the signal processing circuitry can no longer com-

pensate, 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

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 4 .

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 (6250 only). Thus there

will never be a case where only one of the amplifier chan-

nels 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

connected the speakers to ground. If the fault is isolated

to one module (channel pair), the other channels will re-

main unaffected.

Powerflex

6250