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Revision February 2008, Doc. Name: 2006PDD23000009 10-1
Chapter 10 Troubleshooting
If a fault is detected on the servo drive or motor, a corresponding alarm will be activated and the fault
message will be displayed on the LCD display of the digital keypad and the fault code will be shown on the
1-digit 7-segment LED display of the servo drive.
10.1 Fault Messages Table
Servo Drive Fault Messages
Fault Messages
Display Fault Name Fault Description
ALE
Overcurrent
Main circuit current is higher than 1.5 multiple of motor’s
instantaneous maximum current value.
ALE
Overvoltage
Main circuit voltage has exceeded its maximum allowable
value.
ALE
Undervoltage Main circuit voltage is below its minimum specified value.
ALE
Z Pulse shift The corresponding angle of magnetic field of Z phase is error.
ALE
Regeneration error Regeneration control operation is in error.
ALE
Overload Servo motor and drive is overload.
ALE
Overspeed Motor’s control speed exceeds the limit of normal speed.
ALE
Abnormal pulse control
command
Input frequency of pulse command exceeds the limit of its
allowable setting value.
ALE
Excessive deviation
Position control deviation value exceeds the limit of its
allowable setting value.
ALE 10/ALE
Serial communication
error
RS-232/485 serial communication is in error.
ALE 11/ALE
Encoder error (Position
detector fault)
Pulse signal is in error.
ALE 12/ALE
Adjustment error
Adjusted value exceeds the limit of its allowable setting value
when perform electrical adjustment.
ALE 13/ALE
Emergency stop
activated
Emergency stop is activated.
ALE 14/ALE
Reverse limit switch
error
Reverse limit switch is activated.
ALE 15/ALE
Forward limit switch
error
Forward limit switch is activated.
ALE 16/ALE
IGBT temperature
error
The temperature of IGBT is over high.
ALE 17/ALE
Memory error EE-PROM write-in and read-out is in error.
ALE 18/ALE
Serial communication
time out
RS-232/485 serial communication time out
ALE 19/ALE
Motor type error The motor capacity does not match the servo drive setting