10.3.2.3 Alarm / Fault Messages; Fault Handling - ABB ACS5000 User Manual

Depending on the type of fault, the drive opens the main circuit breaker
(MCB) or keeps it closed:
• Class 1 faults (FC 1) open the MCB.
• Class 2 faults (FC 2) do not open the MCB.
Since the MCB is controlled and monitored entirely by the drive, no
external opening command must be given to the MCB when a fault
condition occurs.
A fault condition must be corrected and the fault be manually reset before
the drive can be started again.

10.3.2.3 Alarm / fault messages

When an alarm or a fault occurs, a specific message is saved in the fault
history of the drive. Information on the 64 most recent fault and alarm
events are saved.
10.3.3

Fault handling

The faults are entered into the fault buffer as they occur and are
numbered:
• The last fault entered has number 1.
• The first fault entered has the highest number.
Information of the fault classification (eg, FC 1 or FC 2) is also saved when
the first fault of the fault class is active. Date and time stamps facilitate
fault tracing, especially when a fault leads to several subsequent faults.
Example:
1) +Fault AMC: Fault Class 2
2) +Fault PPCS Communication
3) +Fault AMC: Fault Class 1
4) +Fault DC Undervoltage
In the above example:
4. +Fault DC Undervoltage is the reason for the failure of the drive
system as it occurred first.
3. +Fault AMC: Fault Class 1 classifies the fault.
2. +Fault PPCS Communication represents a subsequent fault that
occurred 2 min. 22 s than the first fault.
. +Fault AMC: Fault Class 2 classifies the fault.
Note: For more information on alarms and faults, see "Appendix G - Signal
and parameter table".
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