YASKAWA SGM Series User Manual page 267

12.2 Troubleshooting
12.2.1 Servomotors
See Table 12.5 for the appropriate action when a problem occurs during operation, and be sure to
turn OFF the servo system power supply before commencing the procedures that are shaded. Con-
tact your Yaskawa representative immediately if the problem cannot be resolved using the de-
scribed procedures.
Symptom
Servomotor does not run
Unstable Servomotor rotation
Servomotor overheated
Abnormal noise
Note Be sure to turn OFF the power supply when performing the inspection or remedy in the shaded boxes.
Table 12.5 Causes, Inspection Areas, and Remedies
Cause
Overloaded
Loose connection
External connector wiring in-
correct
Faulty connection
Ambient temperature too high
Servomotor surface dirty
Overloaded
Mechanical mounting incor-
rect
Bearing defective
Vibration caused by the equip-
ment
Inspection
Try running with no load
Check connector terminals
Check external connector wiring
Check the Phase-U, -V and -W lead
terminals as well as feedback pulse
connection.
Check to see if the ambient tempera-
ture is below 40°C.
Check visually.
Try operating with no load
S Loose Servomotor mounting
screws?
S Coupling not centered?
S Coupling unbalanced?
Check for noise and vibration near
the bearing.
Foreign objects, damage, or de-
formation of sliding parts.
12 -5
12.2 Troubleshooting
Remedy
Reduce the load or replace
with a larger capacity Servo-
motor.
Tighten any loose parts.
Refer to the connection dia-
gram and correct the wiring.
Reconnect the wiring.
Reduce the ambient tempera-
ture to below 40°C.
Clean dust and oil from the
motor surface.
Reduce the load or replace
with a larger capacity Servo-
motor.
S Tighten mounting screws.
S Center or balance the cou-
pling.
Contact your Yaskawa repre-
sentative if defective.
Contact the equipment
manufacturer.
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