Omron OMNUC W Series Manual page 224

A.41
A.41: Main Circuit DC Voltage Error Detected: Low Voltage
Display and Outputs
Alarm Outputs
Alarm Code Outputs
ALO1 ALO2
OFF OFF
Note OFF: Output transistor is OFF (alarm state). ON: Output transistor is ON.
Status and Remedy for Alarm
During Servomotor
operation
Occurred when main
circuit power turned ON
Cause
A The power supply voltage is not within the
range of specifications.
B Fuse blown.
C
Rectifying diode is defective.
D The Servo Driver is defective.
9-13
9.3 Troubleshooting with Alarm Displays
ALM Output
ALO3
ON OFF
Occurred when the control
A, B, C
circuit power turned ON
A, B, C
Check power supply voltage.
Replace the Servo Driver.
D
Remedy
9