Omron OMNUC G5 R88M-K series User Manual page 426

11-4 Troubleshooting
Symptom
Overshooting at a startup
or stop
11
Vibration is occurring at
the same frequency as
the power supply.
11-33
Probable cause
Noise is applied to the
control I/O signal cable
because the cable is longer
than the specified length.
Noise is applied to the cable
because the encoder cable
does not meet
specifications.
Noise is applied to the
encoder cable because the
cable is longer than the
specified length.
Noise is applied to the signal
lines because the encoder
cable is stuck or the sheath
is damaged.
Too much noise is applied to
the encoder cable.
The FG's potential is
fluctuating due to devices
near the Servomotor, such
as welding machines.
Errors are being caused by
excessive vibration or shock
on the encoder.
The Position Loop Gain 1
(Pn100) is too large.
The Speed Loop Gain 1
(Pn101) and the Speed Loop
Integral Time Constant 1
(Pn102) are balanced
incorrectly.
The machine rigidity set by
the realtime autotuning is
incorrect.
The set inertia ratio differs
from the load.
Inductive noise is occurring.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Items to check
Check the length of the control
I/O signal cable.
Check that it is a twisted-pair
shielded cable with core wires
2
that are at least 0.12 mm .
Check the length of the
encoder cable.
Check the encoder cable for
damage.
Check whether the encoder
cable is bound together with or
too close to high-current lines.
Check for ground problems
(loss of ground or incomplete
ground) at equipment such as
welding machines near the
Servomotor.
There are problems with
mechanical vibration or motor
installation (such as the
precision of the mounting
surface, attachment, or axial
offset).
Review the Pn100.
Review the settings on the
Pn101 and Pn102.
Review the setting of machine
rigidity.
Review the Inertial Ratio
(Pn004).
Check whether the drive
control signal lines are too
long.
Check whether the control
signal lines and power supply
lines are not bound together.
Measures
Shorten the control I/O
signal cable to 3 m or
less.
Use encoder cable that
meets specifications.
Shorten the encoder
cable to less than 50 m.
Correct the encoder
cable's pathway.
Install the encoder cable
where it won't be
subjected to surges.
Ground the equipment
properly and prevent
currents from flowing to
the encoder FG.
Reduce the mechanical
vibration or correct the
Servomotor's installation.
Adjust the gain in a
manner that prevents
overshoots.
By the CX-Drive or the
analog monitor, measure
the response and adjust
the gain.
Match the machine
rigidity setting to the load
rigidity.
Align the setting on the
Pn004 with the load.
Shorten the control signal
lines.
• Separate control signal
lines from power
supply lines.
• Use a low-impedance
power supply for
control signals.