5.10 Diagnosing and Resetting Faults
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions 181
5.10 Diagnosing and Resetting Faults
When a fault occurs and the drive stops, follow the instructions below to remove whatever conditions triggered the fault,
then restart the drive.
u Fault Occurs Simultaneously with Power Loss
WARNING! Sudden Movement Hazard. Ensure there are no short circuits between the main circuit terminals (U, V, W) or between
the ground and main circuit terminals before restarting the drive. Failure to comply may result in serious injury or death
and will cause damage to equipment.
1. Turn on the drive input power.
2. Use monitor parameters U2- to display data on the operating status of the drive just before the fault
occurred.
3. Remove the cause of the fault and reset.
Note: 1. To determine out what faults were triggered, check the fault history in U2-02 (Previous Fault). Information on drive status when the
fault occurred, such as the frequency, current, and voltage, can be found in U2-03 through U2-31.
Refer to Viewing Fault Trace Data After Fault on page 181 for information on how to view fault data.
2. When the fault continues to be displayed after cycling power, remove the cause of the fault and reset.
u If the Drive Still has Power After a Fault Occurs
1. Turn the main circuit power supply off.
2. Look at the digital operator for information on the fault that occurred.
3. Refer to Fault Displays, Causes, and Possible Solutions on page 148.
4. Remove the cause of the fault and reset.
Refer to Fault Reset Methods on page 182.
u Viewing Fault Trace Data After Fault
The checking method shown here uses an example in which the drive detects oL2 (Drive Overheat).
Step Display/Result
1 Turn on the drive input power. The first screen displays.
2
Press until the monitor screen is displayed.
3
Press to display the parameter setting screen.
4
Press and to scroll to monitor U2-01 (Previous Fault).
5
Press to view previous fault (oL2 in this example).
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