Omron G5 Series User Manual page 463

Symptom Probable cause
The Servomotor The load inertia is too large. Check for the following:
does not stop or is
hard to stop even if
the Operation
The stop circuit is faulty.
Command (RUN)
signal is turned
OFF while the
Servomotor is
rotating.
The Servomotor The mechanical installation
generates of the Servomotor is
abnormal noise or improper.
vibration.
There is a problem with the
bearings.
The gain setting is
inappropriate.
The value set in Speed
Feedback Filter Time
Constant (Pn103) is
inappropriate.
The control I/O signal cable
is affected by noise
because it does not meet
the specifications.
The control I/O signal cable
is affected by noise
because it is longer than
the specified length.
The encoder cable is
affected by noise because it
does not meet the
specifications.
The encoder cable is affected
by noise because it is longer
than the specified length.
The encoder cable is
affected by noise because it
is stuck by something or
has a torn sheath.
The encoder cable is
affected by excessive noise.
The FG's potential fluctuates
due to equipment installed
near the Servomotor, such
as a welding machine.
The encoder fails due to
excessive vibration or
shock.
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User's Manual
10 Troubleshooting and Maintenance
Check items
• Is the load too high?
• Is the motor speed too high?
–
Check to see if the Servomotor
mounting screws are loose.
Check to see if the coupling is
installed eccentrically.
Check to see if the coupling is
unbalanced.
Check for noise or vibration around
the bearings.
–
Check the value set in Pn103.
Check to see if the cable is a twisted-
pair cable or common shielded
twisted-pair cable with at least
2
0.08-mm core wires.
Check the length of the control I/O
signal cable.
Check to see if the cable is a common
shielded twisted-pair cable with at
2
least 0.12-mm core wires.
Check the length of the encoder cable. Limit the wiring length of
Check the encoder cable for damage.
Check to see if the encoder cable is
bound together with or too close to
high-current lines.
Check for grounding problems (loss of
ground or incomplete ground) of
equipment such as a welding machine
installed near the Servomotor.
There is a problem of mechanical
vibration or defective motor installation
(low mounting surface accuracy, poor
fixing, eccentric mounting).
Measures
Review the load conditions and
replace the Servomotor and the
Servo Drive with proper ones.
Replace the Servo Drive.
Retighten the mounting screws.
Center the coupling.
Adjust the coupling balance.
Contact the OMRON dealer or
sales office.
Perform manual tuning.
Restore the default value 0 or
increase the set value.
Use a control I/O signal cable
that meets the specifications.
Limit the wiring length of the
control I/O signal cable to 3 m
or less.
Use an encoder cable that
meets the specifications.
encoder cables to 20 m or less.
Correct the encoder cabling.
Install the encoder cable where
it is not subject to surges.
Ground the equipment properly
to prevent the current from
flowing into the external
encoder's FG.
Reduce the mechanical
vibration or correct the
Servomotor mounting
conditions.
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