Troubleshooting
16-2
16.1 What to Do If an Error Occurs
16.1.1 Motor is not Rotating or Operating
(Pulse Output A and B LEDs are Flashing or Lit)
Solution 1: Servo motor
Check that the servo input is ON.
R0 Y108
PLC
Servo on input
Motor driver
Positioning unit
Solution 2
Check that the power to the driver is turned on.
Solution 3
Check that the positioning unit and driver are wired correctly.
Solution 4
Check that the pulse output coincides in setting (CW/CCW or Pulse/Sign setting) with the
driver.
16.1.2 Motor is not Rotating or Operating (Pulse Output A and B LEDs off)
Solution
Review the program.
Points of confirmation
1. Check that the I/O numbers are correct.
2. Check that the start contact has not been overwritten in the program.
3. Check the input logic of the over limit switch. (The error LED is lit if the logic is incorrect.)
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