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10. Troubleshooting
10 - 11
Alarm No.
31
Overspeed:
The motor was detected to rotate at a speed exceeding the allowable speed.
Cause of occurrence Investigation items Remedy
1
Rapid traverse rate (rapid) setting is
incorrect.
Check the motor maximum speed and
machine specifications.
Use within the motor's maximum speed.
2
Servo parameter settings are incorrect. Check the SV001 (PC1), SV002 (PC2),
SV018 (PIT) and SV025 (MTYP)
settings.
Correctly set.
Is acceleration/deceleration time
constant too short?
Adjust the acceleration/deceleration
time constant so that the current is not
limited by the motor's maximum current
(torque).
Is the speed loop gain too low? Adjust the gain to that operation is stable.
3
Speed FB is overshooting.
Is the current limited? Set SV013 to 500 as the standard.
Alarm No.
32
Power module overcurrent:
Overcurrent protection function in the power module has started its operation.
Cause of occurrence Investigation items Remedy
1
CPU peripheral circuit operation is
incorrect.
Check for abnormalities in the unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding)
Improve the surrounding environment.
Disconnect the UVW phase connection
from the terminal block and the motor's
cannon plug. Check the insulation with
a tester.
2
Short-circuit or ground fault in motor's
power wire.
Check the insulation across the motor's
power wire and FG.
Replace the motor's power wire.
3
Drive unit is faulty. Check the repeatability.
Does the alarm occur before READY
ON?
If the alarm occurs before READY ON,
replace the drive unit.
4
Ground fault in motor. Check that there is no ground fault in the
power cable. Then, without disconnecting
the cannon plug, check the insulation
across the power cable and FG.
Replace the motor.
(When using the absolute position
system, the zero point must be
established again.)
Check whether the motor is submerged
in cutting solution.
5
Motor is faulty.
Check whether the motor has been
subject to high temperatures.
Replace the motor and improve the
motor installation environment.
(When using the absolute position
system, the zero point must be
established again.)
Alarm No.
33
Overvoltage:
PN bus voltage in main circuit exceeded the allowable value.
Cause of occurrence Investigation items Remedy
1
The regenerative resistor or regenerative
resistor cable is broken.
Disconnect the regenerative resistor
terminal and check the continuity with a
tester.
Replace the regenerative resistor.
Replace the cable.
2
Regenerative resistor connection is
incorrect.
Check the regenerative resistor
connection.
Is the 3-unit parallel connection
connected in serial?
Correctly wire.
3
Regenerative transistor is faulty. Regeneration is not taking place when
there is no problem with the regenerative
resistor.
Replace the drive unit.