4

INTRAC-305

ALARMS & ERRORS

POWER FAILURE

The INTRAC incorporates non-volatile memory and a battery

 

backed real time clock. The onset of a power failure is

 

detected and the current mode is stored before the processor

 

ceases to operate. When power is restored the INTRAC

 

performs an automatic recovery as below :-

 

If the unit was in Auto (Tracking) Mode at the time of the

 

power failure and no Primary Alarms have become active the

 

unit will resume tracking. The antenna will be moved (if

 

necessary) to the current satellite position based on the orbit

 

model and the real time clock.

 

If the unit was in Auto (Learning) Mode it will resume in that

 

mode. However whether it continues learning or re-starts to

 

learn depends on the ratio of the completed learning time to

 

the period without power. (i.e. how dependable the learnt

 

orbit will now be)

 

If the INTRAC was in any other Mode or if a Primary Alarm

 

had occurred the unit will power up in Standby Mode with a

 

power-up alarm.

ERRORS

Errors are user errors and involve the entry of non valid data.

 

Where data is entered outside the allowable limits for that

 

data such as setting the beacon frequency outside the range

 

of the selected band. The entered data is changed to the limit

 

nearest to the entered value and marked with an asterisk (*).

 

On the bottom of the screen the message :-

 

“ENTRY ERROR!, limits forced =*”

 

is displayed.

 

The forced limit data may be accepted by re-pressing the

 

ENTER key or the correct value keyed in.

IESS-412 DATA

Where IESS-412 data is entered with the incorrect 170hr

 

checksum the checksum is corrected by INTRAC in the same

 

manner as above. However it is up to the user to ascertain

 

that it was the checksum which was wrong and not that wrong

 

value data was entered.

© 2011 Advantech Wireless

INTRAC-305 MANUAL - Issue 3.2

Page 51

Page 63
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Advantech user manual INTRAC-305 Alarms & Errors, Power Failure, IESS-412 Data