3.3 Running Mode
3-8
3.3.2 Monitoring light alarms
The FRENIC-MEGA identifies abnormal states in two categories--Heavy alarm and Light alarm (displayed
on digital output terminals). If the former occurs, the inverter immediately trips; if the latter occurs, the
inverter shows the
l-al
on the LED monitor and blinks the KEYPAD CONTROL LED but it continues to
run without tripping. Which abnormal states are categorized as a light alarm ("Light alarm" object) should
be defined with function codes H81 and H82 beforehand. Assigning the LALM signal to any one of the
digital output terminals with any of function codes E20 to E24 and E27 (data = 98) enables the inverter to
output the LALM signal on that terminal upon occurrence of a light alarm.

For details of the light alarm objects, refer to Chapter 2, Section 2.4 "Protective Functions."
îš„ How to check a light alarm factor
If a light alarm occurs,
l-al
appears on the LED monitor. To check the current light alarm factor, enter
Programming mode by pressing the key and select
5_36
on Menu #5 "Maintenance Information."
It is also possible to check the factors of the last three light alarms
5_37
(last) to
5_39
(3rd last). For
details of the menu transition of the maintenance information, refer to Section 3.4.6 "Reading maintenance
information."
îš„ Releasing the light alarm
To return the LED monitor from the
l-al
display to the normal display state (showing the running status
such as reference frequency), press the key in Running mode.
If the light alarm factor(s) has been successfully removed, the KEYPAD CONTROL LED stops blinking
and the digital output LALM also goes OFF. If any light alarm factor persists (e.g., detecting a DC fan lock),
the KEYPAD CONTROL LED continues blinking and the LALM remains ON.
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