Siemens SINAMICS G120 Operating Instructions Manual page 373

The fault buffer can accept up to eight actual faults. The next to last fault is overwritten if an
additional fault occurs after the eighth fault.
Figure 11-7
Acknowledgement
In most cases, you have the following options to acknowledge a fault:
● Switch-off the inverter power supply and switch-on again.
● Press the acknowledgement button on the operator panel
● Acknowledgement signal at digital input 2
● Acknowledgement signal in bit 7 of control word 1 (r0054) for Control Units with fieldbus
Faults detected during the inverter-internal monitoring of hardware and firmware can be
acknowledged only by switching the supply voltage off and on again. The list of faults in the
List Manual contains a note on this limited acknowledgement possibility.
Emptying the fault buffer: Fault history
The fault history can contain up to 56 faults.
The acknowledgement has no effect as long as none of the causes for the faults in the buffer
have been removed. If at least one of the faults in the fault buffer has been removed (the
cause of the fault has been removed) and you acknowledge the faults, then the following
happens:
1. The inverter accepts all faults from the fault buffer in the first eight memory locations of
2. The inverter deletes the faults that have been removed from the fault buffer.
3. The inverter writes the time of acknowledgement of the faults that have been removed
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
Complete fault buffer
interface
the fault history (indexes 8 ... 15).
into parameters r2136 and r2109 (fault time removed).
Alarms, faults and system messages
11.4 Faults
373