Yaskawa Sigma II Series Servo System - Manual (Page 427)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
9 - 39
High rotation speed
overshoot on starting
and stopping.
Speed loop gain value too
high.
—
Reduce speed loop gain
(Pn100) preset value.
Increase integration time
constant (Pn101).
Speed loop gain is too low
compared to position loop
gain.
—
Increase the value of
parameter Pn100 (speed
loop gain).
Reduce the integration time
constant (Pn101).
Servomotor
overheated
Ambient temperature too
high
Measure servomotor ambient
temperature.
Reduce ambient tempera-
ture to 40°C maximum.
Servomotor surface dirty Visual check
Clean dust and oil from
motor surface.
Overloaded Run under no load.
Reduce load or replace with
larger capacity servomotor.
Abnormal noise
Incorrect mechanical
mounting
Servomotor mounting screws
loose?
Tighten mounting screws.
Coupling not centered? Center coupling.
Coupling unbalanced? Balance coupling.
Bearing defective
Check noise and vibration
near bearing.
Consult your Yaskawa
representative if defective.
Machine causing vibra-
tions
Foreign object intrusion, dam-
age, or deformation of sliding
parts of machine.
Consult with machine
manufacturer.
Speed reference 0V
but servomotor
rotates.
Speed reference voltage
offset applied
—
Adjust reference offset.
Refer to sections 7.2.4 and
7.2.5
Symptom Cause Comment Solution