Information subject to change
97-7796264_09-04-2020
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3
14
3.3
details the operational modes indicated by the
Main Status indicators.
3.2.2 Fault Status Indicator
The Fault Status indicator is located on the ampli-
fier front panel. This LED monitors the internal
conditions of the amplifier and will illuminate when
a fault condition occurs. Depending on the fault
condition and the configuration of the unit, the
amplifier may be placed in Standby mode when a
fault condition occurs. Refer to the chart in
Figure
3.4
to determine the fault condition being indicated
and the action required to clear the fault condition.
Figure 3.4 – Fault Status Indicators for Stand-Alone Amplifiers
Indicator is lit
Indicator is not lit
Indicator may be lit
Main Status
Indicators
Fault Status
Reported on
LCD Display
State of Operation
Action Needed to Clear Fault
Condition and Return to
Run Mode
Run
Ready
Standby
Stop
WARNING! OUT
-
PUT DEVICE
FAULT
Output Device Fault:
This indicates
that an Output Fault condition has oc
-
curred and the amplifier has been placed
in Standby mode. The Fault indicator
will light under two conditions: 1) High-
frequency oscillation is causing high
shoot-through current; or 2) An output
transistor has shorted, causing the output
fault condition.
This fault condition cannot be cleared
using the front-panel Reset button. See
the
Troubleshooting
section for more
information on diagnosing and clearing this
fault condition.
Run
Ready
Standby
Stop
WARNING!
OVERLOAD
Overload:
This indicates that the output
of the amplifier could not follow the input
signal due to voltage or current limits. Un
-
der normal operation with the factory-de-
fault settings, an Overload condition will
not place the amplifier in Standby mode.
If the amplifier has been configured to be
forced to Standby on Overload, the ampli
-
fier will be placed in Standby mode when
the Overload condition occurs.
To remedy the Overload fault during
operation, turn down the level of the input
signal until the Fault indicator turns off. To
clear an Overload fault condition when the
amplifier is forced to Standby, turn down
the level of the input signal, then push the
Reset button.
Run
Ready
Standby
Stop
WARNING!
OVERTEMP
Overtemp:
The amplifier monitors
the temperature inside the high-voltage
transformers, low-voltage transformer
and in the output stage heat sinks. The
Fault indicator will light and the amplifier
will be placed in Standby mode when the
temperature sensors detect a condition
that would damage the amplifier. If the
Overtemp pulse is extremely short, as in
the case of defective wiring or switches,
the Fault LED may be lit too briefly to
observe.
To reset after an Over Temp fault has oc
-
curred, make sure the amplifier fans in all
amplifiers are running, and then remove
the input signal from the system. Allow the
fans to run for about 5 minutes until the
system automatically returns to Run mode.
Please see the
“Troubleshooting”
sec-
tion for information on correcting the cause
of an Over Temp fault condition.
Run
Ready
Standby
Stop
WARNING!
OVERVOLTAGE
Overvoltage:
This indicates that the
AC mains voltage is more than +10% of
nominal. The amplifier will be forced to
Standby when an Overvoltage condition
occurs. When the Overvoltage condition
is cleared, the amplifier will automatically
return to Run mode.
To clear an Overvoltage fault condition,
the AC mains must be brought down to
the nominal value. If the amplifier does not
return to Run mode when the Overvoltage
condition has cleared, the amplifier may
require servicing. Please see the
Trouble-
shooting
section for more information.
Summary of Contents for 7548
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