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6 Troubleshooting
MITSUBISHI CNC
6-1 Points of caution and confirmation
If an error occurs in the drive unit, the warning or alarm will occur. When a warning or alarm occurs, check
the state while observing the following points, and inspect or remedy the unit according to the details given in
this section.
<Points of confirmation>
[1] What is the alarm code display?
[2] Can the error or trouble be repeated? (Check alarm history)
[3] Is the motor and servo drive unit temperature and ambient temperature normal?
[4] Are the servo drive unit, control unit and motor grounded?
[5] Was the unit accelerating, decelerating or running at a set speed? What was the speed?
[6] Is there any difference during forward and backward run?
[7] Was there a momentary power failure?
[8] Did the trouble occur during a specific operation or command?
[9] At what frequency does the trouble occur?
[10] Is a load applied or removed?
[11] Has the drive unit been replaced, parts replaced or emergency measures taken?
[12] How many years has the unit been operating?
[13] Is the power supply voltage normal? Does the state change greatly according to the time band?
1. This drive unit uses a large capacity electrolytic capacitor. When the CHARGE lamp on the front of
the power supply unit is lit, voltage is still present. Do not touch the terminal block in this state.
2. Before replacing the unit, etc., always confirm that there is no voltage with a tester or wait at least
15 minutes after turning the main power OFF.
3. The conductivity in the unit cannot be checked.
4. Never carry out a megger test on the drive unit as the unit could be damaged.
CAUTION