6. Troubleshooting
6 - 18
Alarm No.
31
Overspeed
A rotation speed exceeding the motor's tolerable rotation speed was detected.
Investigation details Investigation results Remedies SV SP
The rapid traverse rate is too fast. Set within the motor's maximum
rotation speed.
1 Check the rapid traverse rate (rapid)
and motor maximum rotation speed.
The speed is within the motor's
maximum rotation speed.
Investigate item 2.
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The settings are incorrect. Correctly set. 2 Check the settings for the servo
parameters SV001 (PC1), SV002
(PC2), SV018 (PIT) and SV025
(MTYP).
Correctly set. Investigate item 5.
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The setting is incorrect.
The alarm is detected at 115% of
SP017.
Correctly set. 3 Confirm the spindle parameter
SP017 (TSP) setting.
Correctly set. Investigate item 4.
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There is a problem. Adjust the PLG output waveform. 4 Confirm the PLG output waveform.
Normal. Investigate item 5.
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The waveform is overshooting. Increase the acceleration/
deceleration time constant.
5 Check whether the speed waveform
is overshooting.
The waveform is not overshooting. Check if there is any abnormality in
the unit's ambient environment.
(Ex.: Ambient temperature, noise,
grounding)
{ {
Alarm No.
32
Power module overcurrent
The power module's overcurrent protection function activated.
Investigation details Investigation results Remedies SV SP
The alarm occurs before READY ON.
(The drive unit is faulty.)
Check investigation item 2 and
following, and remove the cause of
the fault. Then replace the drive unit.
1 Check the repeatability.
The alarm occurs after READY ON. Investigate item 2.
{ {
The setting is incorrect.
Servo : SV025
Spindle : SP034, SP040, SP257 to
SP384
Correctly set.
2 Check the parameter setting.
• Motor type
The setting is correct. Investigate item 3.
{ {
The setting is large compared to the
standard value.
Set the standard value. 3 Check the parameter settings.
• Current loop gain
• Speed loop gain
The standard value is set. Investigate item 4.
{ {
The power cable is short-circuited. Replace the motor's power cable. 4 Disconnect the UVW phase wiring
from the terminal block, and the
cannon plug from the motor. Check
the insulation with a tester.
There is no problem. Investigate item 5.
{ {
The power cable is short-circuited. Replace the motor's power cable. 5 Check the insulation between the
motor power cable and FG.
There is no problem. Investigate item 6.
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The motor is short-circuited. Replace the motor.
(With the absolute position system,
the zero point must be established.)
6 Connect the cannon plug, and check
the insulation between the power
cable and FG.
There is no problem. Investigate item 7.
{ {
No abnormality is found in particular. Replace the drive unit. 7 Check for any abnormalities in the
motor's ambient environment.
(Ex.: Ambient temperature, cutting
water)
An abnormality was found in the
ambient environment.
Replace the motor and improve the
motor installation environment.
(With the absolute position system,
the zero point must be established.)
{ {
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