11-14
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
16 0 Overload
When the feedback value for torque
command exceeds the overload level
specified in the Overload Detection
Level Setting (Pn512), overload
protection is performed according to
the overload characteristics.
· The load was heavy, the effective
torque exceeded the rated torque,
and operation continued too long.
· Vibration or hunting occurred due
to faulty gain adjustment. The
Servomotor vibrates or makes
unusual noise. The Inertia Ratio
(Pn004) setting is incorrect.
· The Servomotor wiring is incorrect
or broken.
· The machine load suddenly
became heavy, e.g., the machine
hit an object. The machine was
distorted.
· The electromagnetic brake
remained ON.
· When multiple machines were
wired, the wiring was incorrect and
the Servomotor cable was
connected to a Servomotor for
another axis.
Use the analog output or CX-Drive
and check to confirm that the torque
(current) waveform oscillates and
make sure that is does not oscillate
excessively vertically. Check the
overload warning display and the load
rate through communications.
· Increase the capacities of the
Servo Drive and the Servomotor.
Set longer acceleration and
deceleration times. Reduce the
load.
· Readjust the gain.
· Connect the Servomotor cable as
shown in the wiring diagram.
Replace the cable.
· Remove the distortion from the
machine. Reduce the load.
· Release the brake.
· Wire the Servomotor and the
encoder correctly so that the
wiring matches the axes.
Refer to 3-2 Overload Characteristics (Electronic Thermal Function) for
information on overload characteristics.
The connected external regeneration resistance is lower than the minimum
allowable value (for the minimum allowable value, refer to page 4-56)
Connect a regeneration resistance with a suitable resistance value (for
external regeneration resistance combinations and resistance values, refer to
P.4-59)
Alarm
number
Name Cause Measures
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