Chapter 10 Troubleshooting
10–2
10-1 Points of caution and confirmation
A servo warning or servo alarm occurs if there is an abnormal state in the servo system or if an error
occurs. 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.
<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 amplifier 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 amplifier 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?
CAUTION
1. This servo amplifier uses a large capacity electrolytic capacitor. When the
CHARGE lamp on the front of the driver is lit, there is still a voltage in the
unit. Take care to prevent electric shocks and short circuits. (The voltage
will remain for several minutes after the power is turned OFF.)
2. The conductivity in the amplifier cannot be checked due to the structure.
3. Do not carry out a megger test as the amplifier could be damaged.
10-2 Troubleshooting at start up
If the CNC system does not start up correctly and a system error occurs when the CNC power is
turned ON, the servo amplifier may not have been started up correctly.
Cause of occurrence Investigation method Remedy
The amplifier axis No. setting is incorrect. Is there another amplifier (servo/spindle) set
to the same axis No.? Check the rotary
switch setting.
Set correctly.
Is the connection to the I/F unit correct? Connect correctly.
Is the I/F unit DIP switch OFF (D/A output
state for adjustment)?
Turn ON.
The CNC setting is incorrect. Is the No. of CNC controlled axes correct? Set correctly.
Is the I/F unit connector disconnected? Connect correctly. Communication with CNC is incorrect.
Is the cable broken?
Check the conductivity with a tester.
Replace the cable.
The I/F unit does not operate Is the I/F unit power being supplied? Connect correctly.
I/F unit trouble Check the repeatability. Replace the I/F unit
NC trouble Check the repeatability. Replace the NC
The amplifier does not operate Is the 200VAC power being supplied
correctly?
Connect correctly.
Amplifier fault Check the repeatability. Replace the amplifier.
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