11-25
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
The Servomotor
holding brake is
ineffective.
Power is supplied to the holding
brake.
Check whether power is supplied to the
holding brake.
Configure a circuit that cuts power
supply to the holding brake when the
motor stops and the load is held by
the holding brake.
The motor does not
stop or is hard to stop
even if the operation
command (RUN) is
turned OFF while the
motor is rotating.
The load inertia is too large. Check the following:
·Is the load too large?
·
Is the motor rotation speed too high?
Review the load conditions, and
replace the Servomotor and Servo
Drive with appropriate models.
The stop circuit failed. − Replace the Servo Drive.
The motor is
producing unusual
noises or the
machine is vibrating.
(Continued on next
page)
There are problems with the
machine's installation.
Check to see if the Servomotor's
mounting screws are loose.
Retighten the mounting screws.
Check whether the axes are misaligned in
the coupling.
Align the coupling.
Check whether the coupling is unbalanced.
Adjust the coupling's balance.
There is a problem with the
bearings.
Check for noise or vibration around the
bearings.
Contact your OMRON dealer or
sales office.
The gain is wrong. − Perform manual tuning.
The Speed Feedback Filter Time
Constant (Pn103) is wrong.
Check the value set in Pn103. Return the set to 0 (default set) or
increase the set value.
Noise is entering into the control
I/O signal cable because the cable
does not meet specifications.
Check to see if the cable is a twisted-pair
cable or shielded twisted-pair cable with
core wires that are at least 0.08 mm dia.
Use a control I/O signal cable that
meets specifications.
Noise is entering into the control I/O
signal cable because the cable is
longer than the specified length.
Check the length of the control I/O signal
cable.
Shorten the control I/O signal
cable to 3 m or less.
Noise is entering into the cable
because the encoder cable does
not meet specifications.
Check to see if it is a shielded twisted-pair
cable with core wires that are at least 0.12
mm dia.
Use an encoder cable that meets
specifications.
Noise is entering into the encoder
cable because the cable is longer
than the specified length.
Check the length of the encoder cable. Shorten the encoder cable to less
than 50 m.
Noise is entering into the signal
lines because the encoder cable is
stuck or the sheath is damaged.
Check the encoder cable for damage. Correct the encoder cable's
pathway.
Excessive noise on encoder
cable.
Check to see if the encoder cable is
bound together with or too close to high-
current lines.
Install the encoder cable where it
won't be subjected to surges.
The FG's potential is fluctuating
due to devices near the
Servomotor, such as welding
machines.
Check for ground problems (loss of
ground or incomplete ground) at
equipment such as welding machines
near the Servomotor.
Ground the equipment properly
and prevent current from flowing
to the encoder FG.
Errors are being caused by
excessive vibration or shock on
the encoder.
There are problems with mechanical
vibration or Servomotor installation (such
as the precision of the mounting surface,
attachment, or axial offset).
Reduce the mechanical vibration
or correct the Servomotor's
installation.
The motor is
producing unusual
noises or the
machine is vibrating.
(Continued from
previous page)
The machine and the motor are
resonating.
Check to see if the machine is resonating.
· Readjust the torque command
filter time constant.
· If there is resonance, set the
Notch Filter 1 Frequency
(Pn201), Notch Filter 1 Width
(Pn202), and Notch Filter 1
Depth (Pn203).
Symptom Probable cause Items to check Measures
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