CHAPTER 7 MAINTENANCE AND INSPECTION
Troubleshooting Method 7-7
7
3. Overvoltage
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
The source voltage is too high
(immediately after power-on).
Check if the source voltage is within the specification
limits.
Insert a reactor if there is a power factor improvement
capacitor.
Unconnected external regenerative
resistor or wrong wiring
Connect the external regenerative resistor.
Correct the wiring of the external regenerative resistor.
Broken regenerative transistor Replace the servo amplifier.
The internal DC voltage can be checked in the monitor mode of the keypad.
[on15]: Internal DC link voltage (max. value)
Approximately over 420 V, overvoltage is detected.
4. Encoder Trouble
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Fault in data sent from encoder Use shielded cables to eliminate noise effects.
Failure of encoder Replace the servomotor.
5. Circuit Trouble
[Display] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Failure of servo amplifier
Turn the power off then on again. If restoration
is not obtained, replace the servo amplifier.
The DC voltage inside the servo amplifier exceeds the upper limit.
There is a fault in the encoder built in the servomotor.
(Communications are normal.)
Et1: Single revolution position detection fault of encoder
Et2: Encoder memory data reading fault
There is a fault in the source control power voltage inside the
servo amplifier. There may be a failure in the internal circuit.
Hu
Et1
Et2
ct
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