User's Manual Part 1

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exciters). If the alarm ends, the transmitter is automatically switched on again.
Fan Control
In case of fan alarm, that is when the FANS CONTROL shows that they are not working properly, the AC
switches off the AMs and exciter(s) after a few seconds, but keeps the fans on, unlike the Interlock alarm. If
the alarm was due to a temporary block or failure and the fans restarts working, the AC automatically switches
on the AMs and exciter(s) again.
RF Powers
The AC continuously monitors the value of the RF powers in antenna and of the unbalancing, and shows them
on the display. Each power has a maximum threshold which is set in factory depending on the type of transmitter.
If any of this power goes beyond this threshold, the AC indicates an alarm condition by means of the LEDs
and buzzer, and by blinking the indication of the power on the display.
The transmitter is not switched off in this case, because the AMs are protected against excessive power
values. It is possible to enable the REF protection that causes the switching off when the reflected power in
antenna is too high.
LEDs
On the front panel there are six status LEDs which allow a visual verification of the status of the transmitter.
The three LEDs on the left (ON, REMOTE and ALARM) are general ones; the three on the right (FWD,
REF and UNB) refer to the alarms concerning RF powers. Table below shows the meaning of each LED.
LED COLOUR OFF ON BLINKING
ON
Green Transmitter Off Transmitter On Transmitter Off by remote
REMOTE
Yellow Remote control disabled Remote control enabled -
ALARM
Red No alarm present Alarm present Alarm ended
FWD
Red
Forward power
under the threshold
-
Forward power
beyond the threshold
REF
Red
Reflected power
under the threshold
-
Reflected power
beyond the threshold
UNB
Red
All of Unbalancing
under the threshold
-
One of Unbalancing
beyond the threshold
3.3 MENU
During normal operation, all information gathered by the AC (RF powers, parameters of the AMs, temperature,
date, time, etc) are displayed on a large 240x128 graphic display provided with backlight. If this display is