User's Manual

SECTION III OPERATION
SM 7063 07/97 3-24
3.12 ALARM INDICATIONS
The CDU incorporates 4 dedicated RED annunciators in conjunction with messages displayed on the
ID Code Display to present alarm conditions to the locomotive operator. These operate as described
in the following paragraphs.
3.12.1 Low Battery
The
LOW BATTERY
annunciator turns ON to indicate the existence of a low battery capacity condition
in the End Unit. The
ID Code Display
indicates if the alarm is a weak or replace battery condition and
will alternate with other information already being displayed such as the current ID code.
To gain attention from the locomotive operator, when a low battery condition is first sensed, the
LOW
BATTERY
annunciator will flash 5 times accompanied by beeps from the sonalert. The
ID Code
Display
will also flash:
“WEAKBATT”
or
“REPLBATT”
to indicate a weak or replace battery condition, respectively.
The
LOW BATTERY
annunciator will then stay ON until the battery in the End Unit has been replaced.
The “WEAKBATT” and “REPLBATT” messages will continue to be shown on the ID Code Display and
will alternate with other information already being displayed. These messages will extinguish once the
End Unit Battery has been replaced.
A weak battery condition indicates that there are several hours of operating life remaining in the
battery, depending on the condition of the battery itself, the number of radio transmissions occurring,
temperature, and ambient light conditions (i.e., duration that the HVM light is flashing). This indication
serves as a warning that a charged battery is required.
A replace battery condition indicates that there is very little battery capacity left and that the End Unit
may not continue to operate until the next scheduled stop.
NOTE
If the battery is unable to maintain End Unit operation, a communications
failure ALARM will result.