Alarms, faults and system messages
9.2 Alarms
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
247
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Figure 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.
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Figure 9-4 Shifting alarms that have been removed into the alarm history
The alarms that have still not been removed remain in the alarm buffer and are resorted so
that gaps between the alarms are filled.
If the alarm history is filled up to index 63, each time a new alarm is accepted in the alarm
history, the oldest alarm is deleted.
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