CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE 137
Alarm / fault messages
If 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.
10.3.3 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, 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 con-
trol panel.
For further information, see
117CDP control
panel
.
Do not clear the fault buffer now!
3. Identify the fault and make a logbook entry.
Note the fault message displayed on the CDP
control panel.
4. Save the content of the data logger when a PC
is available that has the DriveWindow
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 signal and parameter table.
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