Siemens SINAMICS G120 Operating Instructions Manual page 284

Alarms, faults and system messages
12.2 Alarms
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.
Figure 12-3
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. The inverter
sorts the alarms in the alarm history in the inverse sequence to the alarm buffer.
● the youngest alarm is in index 8
● the second youngest alarm is in index 9
● etc.
282
Complete alarm buffer
Figure 12-4 Shifting alarms that have been removed into the alarm history
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB