Siemens SINAMICS G120 Operating Instructions Manual page 287

Figure 12-7
Fault 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 that are triggered by internal converter hardware and firmware monitoring functions
can only be acknowledged by switching off and on again. You will find a note about this
restricted option to acknowledge faults in the fault list of the List Manual.
Emptying the fault buffer: Fault history
The fault history can contain up to 56 faults.
The fault acknowledgement has no effect as long as none of the fault causes of the fault
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
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
Complete fault buffer
interface
the fault history (indices 8 ... 15).
into parameters r2136 and r2109 (fault time removed).
Alarms, faults and system messages
12.3 Faults
285