8. MAINTENANCE
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Table 8-2 (2/2) Troubleshooting (Non-Alarm)
No
Malfunction Inspection
Causes and corrective
measures
6 Excessive overshoot/undershoot
during start/stop
• Servo tuning at “High”
• Lower velocity loop gain
• Increase integral time constant
• Loosen acceleration /
deceleration command pattern
• Use position command low pass
filter
(1) Check for mechanical
faults
• Operate servomotor by itself
• Check centering and balance on
coupling
7 Abnormal noise
(2) Operate at low speed
and check for random
abnormal noise
• Check if sensor signal line is
pair-twisted and shielded.
• Check if sensor and power lines
are connected to the same duct
• Check if power supply voltage
drops
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