Chapter 10 Troubleshooting
If a fault is detected on the servo motor or drive, a corresponding fault code will be shown on
the drive's LED display. Fault codes can also be transmitted via communication, see P0-01 and
P4-00 ~ P4-04 for display on controller or HMI.
10.1 Fault Messages Table
Servo Drive Fault Messages
Fault Messages
Display Fault Name Fault Description
Overcurrent
Main circuit current is higher than 1.5 multiple of
motor’s instantaneous maximum current value.
Overvoltage
Main circuit voltage has exceeded its maximum
allowable value.
Undervoltage
Main circuit voltage is below its minimum specified
value.
Motor error
The motor does not match the drive. They are not
correctly matched for size (power rating).
Regeneration error Regeneration control operation is in error.
Overload Servo motor and drive is overload.
Overspeed
Motor’s control speed exceeds the limit of normal
speed.
Abnormal pulse
control command
Input frequency of pulse command exceeds the limit of
its allowable setting value.
Excessive deviation
Position control deviation value exceeds the limit of its
allowable setting value.
Reserved
Encoder error Pulse signal is in error.
Adjustment error
Adjusted value exceeds the limit of its allowable setting
value when perform electrical adjustment.
Emergency stop
activated
Emergency stop switch is activated.
Reverse limit switch
error
Reverse limit switch is activated.
Forward limit switch
error
Forward limit switch is activated.
Revision January 2011 10-1
Call 1(800)985-6929 for Sales
Call 1(800)985-6929 for Sales
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