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Chapter 11 Troubleshooting
11–2
11-1 Points of caution and confirmation
If an error occurs in the servo system, the servo warning or servo alarm will occur. When a servo
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.
CAUTION
1. This servo system uses a large capacity electrolytic capacitor. When the
CHARGE lamp on the front of the power supply unit (MDS-B-CV,
MDS-A-CR) in the system is lit, there is a residual voltage. Take special
care to prevent accidents such as electric shocks and short-circuits. (The
voltage will remain for several minutes after the power is turned OFF.)
2. The conductivity in the driver cannot be checked due to the structure.
3. Do not carry out a mega test as the driver could be damaged.
<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 driver temperature and ambient temperature normal?
4. Are the servo driver, 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 driver unit been replaced, parts replaced or emergency measures taken?
12. How many years has the unit been operating?
13. Is the power voltage normal? Does the state change greatly according to the time band?
LED display during servo alarm
LED display during servo warning
F1 (flicker)
F + axis No.
37 (flicker)
Alarm No.
Not lit
F1 (flicker)
F + axis No.
37 (flicker)
Alarm No.
9F
Warning No.
F1
F + axis No.
F1
F + axis No.
9F
Warning No.
Not lit