Alarms, faults and system messages
9.4 Faults
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
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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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Figure 9-8 Fault history after acknowledging the faults
After acknowledgement, the faults that have not been removed are located in the fault buffer
as well as in the fault history. For these faults, the "fault time coming" remains unchanged
and the "fault time removed" remains empty.
If less than eight faults were shifted or copied into the fault history, the memory locations with
the higher indices remain empty.
The inverters shifts the values previously saved in the fault history each by eight indices.
Faults, which were saved in indices 56 … 63 before the acknowledgement, are deleted.
Deleting the fault history
If you wish to delete all faults from the fault history, set parameter p0952 to zero.
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