Siemens SINAMICS G120 Operations Instructions Page 254

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Alarms, faults and system messages
9.3 Faults
Inverter with CU240B-2 and CU240E-2 Control Units
252 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
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.
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Figure 9-7 Complete fault buffer
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
interface
Faults that are triggered by monitoring of hardware and firmware inside the inverter 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
the fault history (indices 8 ... 15).
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
into parameters r2136 and r2109 (fault time removed).
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