ALARMS & ERRORS INTRAC-305
Page 50 INTRAC-305 MANUAL - Issue 3.2 © 2011 Advantech Wireless
SECONDARY ALARMS There are three Secondary Alarms :-
Unable to Predict Alarm.
Beacon Alarm.
Servo Alarm.
Unable to Predict This alarm is raised when the INTRAC has not enough
confidence in the orbit model to be able to predict the
satellites position. e.g. during the early part of learning a new
model or after there had been no beacon signal for more than
72 hours.
Beacon Alarm The Beacon Alarm is raised when the signal strength does
not vary during step cycles or when beacon lock is lost.
Servo Alarm The Servo Alarm is raised when the INTRAC fails to detect
the expected amount of antenna movement during a step
cycle. This can be caused by the servo performance not
corresponding to the routine’s model of the antenna drive
characteristics. The INTRAC reacts by repeating the step
cycle with a larger drive demand.
Secondary Alarms do not, necessarily, mean that there is a
system fault nor do they illuminate the System Alarm
indicator. The occurrence of a secondary alarm may be
checked by selecting Show Alarms in the Home menu.
ALARM OUTPUTS Three sets of changeover relay contact outputs are available
on a 25-way D-type connector on the INTRAC rear panel.
There is one relay for a Primary Alarm, one for a Secondary
Alarm and the third indicates that the beacon signal has fallen
below the user set beacon threshold.
RECOVERING FROM ALARMS All Primary Alarms, except the Hardware Alarm in Auto Mode,
cause the unit to be put into Standby Mode. Recovery from
Drive Fail, Synchro and Hardware (other than when in Auto
Mode) Alarm conditions are cleared by pressing any Mode
selection key (eg Standby). Soft Limit and hard limit alarms
can only be cleared by driving back from the limit using
Manual Mode. Emergency Stop and Interlock alarms can
only be cleared by removing the cause of the alarm.
If a Hardware Alarm occurs when the INTRAC is in Auto
Mode the unit will perform a processor reset and then enter
learning mode to re-learn the orbit model.