CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE 158
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 sev-
eral subsequent faults.
Example:
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
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.
• 1. +Fault AMC: Fault Class 2 classifies the fault.
10.3.4 Troubleshooting procedure
If a fault shuts down the drive, proceed as follows:
1. Do not switch off the auxiliary power supply or
try to reset a fault message before all informa-
tion at the time of the occurrence of the fault
condition has been saved.
2. Select the Fault History Display on the CDP
control panel.
For further information, see Chapter 9 - CDP
control panel.
Do not clear the fault buffer of the drive now!
3. Identify the fault and make a logbook entry.
4. Save the content of the data logger when a PC
is available that has the Drive
Window
or Drive-
Debug
tool installed.
The data logger provides information (eg,
waveforms of voltage, current, torque) for effi-
cient troubleshooting.
5. Contact ABB service if a fault cannot be recti-
fied.
When calling ABB service, it is recommended to
have the following data available at the time
when the fault occurred:
- Operating, ambient and load conditions
- Unusual events
After the fault has been rectified, start the drive as
described in Chapter 8 - Operation.
For further information on alarms and
faults, see Appendix G – Signal and
parameter table.
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