Yaskawa Large Capacity Sigma II Series - Manual (Page 375)

8 Inspection, Maintenance, and Troubleshooting
8.2.2 Troubleshooting Problems with No Alarm Display
8-36
Servomotor Vibrates at Ap-
proximately 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/posi-
tion reference input lead, with
impedance not exceeding sev-
eral 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 Over-
shoot on Starting and Stop-
ping Speed loop gain value too high. Reduce speed loop gain
(Pn100) preset value.
Increase integration time con-
stant (Pn101).
Speed loop gain is too low com-
pared to position loop gain. Increase speed loop gain
(Pn100) preset value.
Reduce the integration time
constant (Pn101).
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 repre-
sentative 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.
Refer to sections 6.2.4 and
6.2.5.
Table 8.4 Troubleshooting Table of No Alarm Display (cont’d)
Symptom Cause Inspection Remedy