6.2Troubleshooting
367
Symptom RemedyInspectionCause
Servomotor vibrates at
approximately 200 to
Speed loop gain value too
high.
Reduce speed loop gain
(Cn-04) preset value.
400 Hz.
Speed/position reference
input lead too long.
Minimize length of
speed/position reference
input lead, with impedance
not exceeding several
hundred ohms
Speed/position reference
input lead is bundled with
power cables.
Separate reference input
lead at least 30 cm from
power cables.
High rotation speed
overshoot on starting and
stopping.
Speed loop gain value too
high.
Reduce speed loop gain
(Cn-04) preset value.
Servomotor overheated
Ambient temperature too
high
Measure servomotor
ambient temperature.
Reduce ambient
temperature to 40°C max.
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 Mechanical mounting
incorrect
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 vibrations Foreign object intrusion,
damage or deformation of
sliding parts of machine.
Consult with machine
manufacturer.
Speed reference 0 V but
servomotor rotates.
Speed reference voltage
offset applied
--- Refer to Subsections 4.2.4
and 4.2.5 and adjust
reference offset.
6
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