4
| ALARMS & ERRORS |
4.ALARMS & ERRORS
The
Alarms and Secondary Alarms. The system will go into
Standby mode if a Primary Alarm is triggered. Secondary
Alarms leave the INTRAC in its current mode.
PRIMARY ALARMS | A Primary Alarm becomes active if one (or more) of the | |
| following conditions arise :- | |
| ⎯ Antenna movement limit switch activated. | |
| ⎯ | Software limit tripped. |
| ⎯ Emergency Stop button operated. | |
| ⎯ | Interlock switch activated. |
| ⎯ Motor drive failure. (Drive Fail Alarm) | |
| ⎯ Antenna moves in wrong direction. (Drive Fail Alarm) | |
| ⎯ | Hardware (processor) fault. |
| ⎯ | Antenna driven within 1.4° of 0° Az in the Northern |
|
| Hemisphere or within 1.4° of 180° Az in Southern |
|
| Hemisphere (Drive Fail Alarm). |
| ⎯ Resolver fault. (Synchro alarm) (apparent position | |
|
| change of more than 1.4° in1/64 second). |
Drive Fail Alarm | The Drive Fail Alarm encompasses a number of other alarms. | |
| If there has been no change in the least significant bit (LSB) | |
of the resolver output within 10 seconds of drive being activated. If either Az or El axis drive more than 1.4° in the wrong direction. If the antenna is driven within 1.4° of North (Azimuth 0°) {or 1.4° of South (Az 180°) Southern Hemisphere}.
The Drive Fail Alarm is not activated in Manual (P) Mode.
If a drive
When any Primary Alarm becomes active the red “System Alarm” indicator on the INTRAC front panel illuminates and the system enters Standby Mode. The actual alarm which has occurred can then be viewed on the screen by pressing Menu Key 5 (Show Alarms) in the Home menu.
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