CHAPTER 7 MAINTENANCE AND INSPECTION
7-6
Troubleshooting Method
7
7.3 Troubleshooting Method
1. Overcurrent
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Wrong servomotor output wiring
Short circuit or grounding fault in
servomotor output wiring
Correct the wiring of power cables (U, V and W).
Check cables visually or through continuity check
and replace the defective cable.
Servomotor insulation fault
Measure the insulation resistance. (Several MΩ or
over to ground)
Failure of servomotor
Measure the resistance across cables. (Several Ω
between cables)
Incorrect resistance of regenerative resistor
Replace with the regenerative resistor within the
rating.
Current imbalance caused by an encoder
fault
Replace the servomotor.
Unconnected grounding cable Connect the grounding cable.
2. Overspeed
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Wrong servomotor output
wiring
Correct the wiring of power cables (U, V and W).
The rotation speed of the
servomotor overshoots.
Check the speed waveform during acceleration with the PC
Loader or similar (see the figure below) and take the following
countermeasures.
Increase PA1_15 (auto tunimg gain 1).
Increase PA1_37 (acceleration time).
Increase PA1_52 (S-curve time constant).
The output current of the servo amplifier exceeds the rated value.
OC1: Direct detection by internal transistor of servo amplifier
OC2: Indirect detection with software of servo amplifier
The rotation speed of the servomotor exceeds 1.1 times the maximum
speed.
最高回転速度
時間
オーバーシュート
Max. rotation speed
Overshoot
Time
oC1
oC2
oS
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