TM 11-7025-221-10
2-2. ALARMS Indicators - Continued.
MINOR Indicator.
1. Lights when a fault was detected and fault lasted one second or less.
2. Lights when a fault that caused MAJOR or BUS indicator to light is no longer detected.
3. indicator remains lit until it is automatically turned off when alarms recall routine is performed.
NOTE
Detected faults that are intermittent (fault lasts longer than one
second, goes away, returns, goes away, etc) or multiple detected
faults can cause various combinations of MAJOR and MINOR dis-
plays. The following chart describes various combinations of these
displays and typical fault conditions that could cause them.
Combinations of MAJOR and MINOR Indicator Displays
Indicator status
Fault description
MAJOR and MINOR indicators
Fault is detected that lights MAJOR. Fault goes away, causing MAJOR
to go off and MINOR to light. Same fault reoccurs, causing
alternately light and
MAJOR to light and MINOR to go off. As long as same intermittent
go off.
fault is detected, MAJOR and MINOR continue to alternate on and
off.
MAJOR and MINOR both lit.
Fault is detected that lights MAJOR. Later, a second fault of the type
that would light MAJOR is detected. One of the two faults is no longer
detected, This causes MINOR to light.
MAJOR lit and MINOR
Same as described above except that fault which went away is again
blinks. (Blink rate
detected (MINOR goes off) and then goes away (MINOR lights
depends on fault
again). As long as fault is intermittent, MINOR will turn on
characteristics. )
and off. Presence of other fault keeps MAJOR lit.
MINOR lit and MAJOR
Fault is detected that lights MAJOR. Fault goes away, causing MAJOR
blinks. (Blink rate
to go off and MINOR to light. A different fault is detected that lights
depends on fault
MAJOR (MINOR still lit). The different fault is an intermittent
characteristics.)
problem that goes away and returns. This causes the MAJOR to
turn off and light each time the fault goes away and then is detected
again. MINOR continues to be lit as a result of first fault that was
detected and then went away.
2-5
