3-4
Function code E42 (LED display filter) allows you to filter the monitoring signals for the monitor items such as output
frequency and output current. Increase the E42 data if the monitored values are unstable and unreadable due to
fluctuation of load.
3.3.2 Monitoring light alarms
The FRENIC-MEGA identifies abnormal states in two categories--Heavy alarm and Light alarm. 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 (= 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 6 "TROUBLESHOOTING," Table 6.1.
■ How to check a light alarm factor
When 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."
■ How to remove the current light alarm
After checking the current light alarm factor, to switch the LED monitor back to the running status display (e.g., output
frequency) from the
l-al
indication, press the key in Running mode.
If the light alarm factor has been removed, the KEYPAD CONTROL LED stops blinking and the
LALM signal turns OFF. If
not (e.g. DC fan lock), the KEYPAD CONTROL LED continues blinking and the
LALM signal remains ON.
To Next Page
Loading...
