Yaskawa MP940 - Manual (Page 399)

SERVOPACK Inspection, Maintenance, and Troubleshooting
10.2.2 Troubleshooting Problems with No Alarm Display
10-32
Servomotor Vibrates at
Approximately 200 to
400 Hz. Speed loop gain value too high. Reduce speed loop gain (Pn100)
preset value.
Speed/position reference input
lead too long. Minimize length of speed/position
reference input lead, with imped-
ance not exceeding several hun-
dred 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 (Pn100)
preset value.
Increase integration time constant
(Pn101).
Servomotor
Overheated Ambient temperature too high Measure servomotor ambient
temperature. Reduce ambient temperature to
40ºC max.
Servomotor surface dirty Visual check Clean dust and oil from motor sur-
face.
Overload Perform operation with no
load. Lighten the load, or replace with
greater capacity motor.
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 representa-
tive if defective.
Machine causing vibrations Foreign object intrusion, dam-
age or deformation of sliding
parts of machine. Consult with machine manufac-
turer.
Speed Reference 0 V
but Servomotor
Rotates. Speed reference voltage offset
applied Adjust reference offset.
Symptom Cause Inspection Remedy