10 PREVENTIVE AND CORRECTIVE MAINTENANCE
3BHS212794 E01 REV M
ACS6000
USER MANUAL
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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
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.
10.3.2.1 Alarm and fault messages
When an alarm or a fault occurs, a specific message is saved in the fault
buffer of the drive. Information on the 64 most recent fault and alarm
events are saved.
10.3.2.2 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:
In the above example:
+Fault DC Under voltage:
is the reason for the failure of the drive
system as it occurred first.
+Fault AMC:
Fault Class 1 classifies the fault.
+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”.
1) +Fault AMC: Fault Class 2 2008-01-08 16:58:24.3770
2) +Fault PPCS Communication 2008-01-08 16:58:24.3760
3) +Fault AMC: Fault Class 1 2008-01-08 16:56:02.1170
4) +Fault DC Undervoltage 2008-01-08 16:56:02.1170
