User Manual

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Moving from MUTE to POWER ON state (for example, after switching on or when an active alarm disappears)
is performed by moving through a temporary POWER UP state. Instead, moving from POWER ON to
MUTE state (for example, when a serious alarm occurs or the ASI/SMPTE inputs are corrupted or absent)
is immediate.
1.4.9 ALARMS AND AUTOMATION
The ATSC TRANSMITTER is fully protected against any malfunctioning event that could damage the expensive
internal components. The user should clearly understand what happens in presence of alarms and warnings,
in order to face these situations properly and reduce the inactivity time.
In case of any alarm condition, the ALARM LED on the front panel lights up and a bell icon appears in the
status bar of the display. When the alarm condition ceases, the ALARM LED is turned off and the bell icon
starts blinking, in order to show that an anomaly occurred since the last visit to the log. To know the details
about the alarm event (for example the time and date of its occurrence), the log menu can be used. Once the
user enters the log screen, the bell icon disappears. When you note an active alarm (the bell icon is shown and
not blinking and the ALARM LED
is on), go to the ALARM screen to see which alarms are present. For certain dangerous situations, the ATSC
TRANSMITTER immediately switches off the output power, by acting on the RF power transistors gate, in
order to save the internal parts from an unrecoverable damage. When the alarm disappears, the power is
automatically switched on again. Once the output power has been inhibited for 5 times, the ATSC
TRANSMITTER goes into "Lockout" state: the power remains off until the user resets the Lockout condition,
or switches the equipment off for repair. After one hour from the last alarm and without the Lockout condition,
the Lockout counter is automatically cleared. The list of the automatic interventions in case of anomalies can
be found below.
z Amplifier Voltage
An amplifier power supply voltage alarm occurs when the monitored voltage is outside the nominal level
±10% range. The nominal voltage level is a factory setting (usually, 28V). This alarm does not trigger a
powering off of the output signal. If the monitored voltage is near 0V, most probably the fuse located near the
power amplifier stage is burned.
z Amplifier Current
An amplifier power supply current alarm occurs when the monitored current drained by the amplifier is 20%
above the nominal level. The nominal current level is a factory setting. This alarm does not trigger a powering
off of the output signal.
z Amplifier Temperature
The temperature is monitored on the hottest point, located near the power amplifier stage on the cooling heat
sink. If the fans work well, and the ambient temperature is inside the working conditions limits, all of the