97-2105006_4-2-15
Information subject to change
13
2105 OPERATOR’S MANUAL –
SECTION 4
4.1.5 Fault Status Indicator
Four Fault Status indicators are located on the
amplifier front panel (see
Figure 4.4
). These LEDs
monitor the internal conditions of the amplifier
and will illuminate when a fault condition occurs.
Depending on the fault condition and the configu
-
ration of the unit, the amplifier may be placed in
Standby mode when a fault condition occurs. Re-
fer to the chart in
Figure 4.6
to determine the fault
condition being indicated and the action required
to clear the fault condition.
Figure 4.6 – Fault Status Indicators for Stand-Alone Amplifiers
Indicator is lit
Indicator is not lit
Indicator may be lit
Main Status
Indicators
Fault Status
Indicators
State of Operation
Action Needed to Clear Fault
Condition and Return to
Run Mode
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Output Fault status:
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
“Trouble-
shooting”
section for more informa-
tion on diagnosing and clearing this fault
condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Load status:
This indicates that
the output of the amplifier could not follow
the input signal due to voltage or current
limits. Under normal operation with the
factory-default settings, an Over Load
condition will not place the amplifier in
Standby mode. If the amplifier has been
configured to be forced to Standby on
Over Load, the amplifier will be placed in
Standby mode when the Over Load indica
-
tor lights.
To remedy the Over Load fault during
operation, turn down the level of the input
signal until the Over Load indicator turns
off. To clear an Over Load 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
Fault
Over Load
Over Temp
Over Voltage
Over Temp status:
The amplifier
monitors the temperature inside the high-
voltage transformers, low-voltage trans
-
former and in the output stage heat sinks.
The Over Temp indicator will light and the
amplifier will be placed in Standby mode
when the temperature sensors detect a
condition that would damage the ampli
-
fier. If the Over Temp pulse is extremely
short, as in the case of defective wiring or
switches, the Over Temp LED may be lit
too briefly to observe.
To reset after an Over Temp fault has
occurred, make sure the fans are running,
and then remove the input signal from the
amplifier. Allow the fans to run for about
5 minutes until the amplifier automati
-
cally returns to Run mode. If the amplifier
has been configured for Standby mode
on Over Temp, then the amplifier will not
automatically return to Run mode. In that
case, push the Reset button to return the
amplifier to Run mode. See the
“Trouble
-
shooting”
section for information on cor-
recting the cause of an Over Temp fault
condition.
Run
Ready
Standby
Stop
Fault
Over Load
Over Temp
Over Voltage
Over Voltage status:
This indicates
that the AC mains voltage is more than
+10% of nominal. The amplifier will be
forced to Standby when an Over Voltage
condition occurs. When the Over Voltage
condition is cleared, the amplifier will auto
-
matically return to Run mode.
To clear an Over Voltage fault condition,
the AC mains must be brought down to
the nominal value. If the amplifier does
not return to Run mode when the Over
Voltage condition has cleared, the ampli
-
fier may require servicing. Please see
the
“Troubleshooting”
section for more
information.
