Alarms, faults and system messages
9.3 Alarms
Converter with the CU240B-2 and CU240E-2 Control Units
406 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
The alarm buffer can contain up to eight alarms. If an additional alarm is received after the
eighth alarm - and none of the last eight alarms have been removed - then the next to last
alarm is overwritten.
Image 9-3 Complete alarm buffer
Emptying the alarm buffer: Alarm history
The alarm history traces up to 56 alarms.
The alarm history only takes alarms that have been removed from the alarm buffer. If the
alarm buffer is completely filled - and an additional alarm occurs - then the inverter shifts all
alarms that have been removed from the alarm buffer into the alarm history. In the alarm
history, alarms are also sorted according to the "alarm time received", however, when
compared to the alarm buffer, in the inverse sequence:
● The youngest alarm is in index 8
● The second youngest alarm is in index 9
● etc.
Image 9-4 Shifting alarms that have been removed into the alarm history
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