Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 380

14. USING A DIRECT DRIVE MOTOR
Alarm No.: 21 Name: Encoder normal communication error 2
Alarm content
Display Detail name
21.1 Encoder data Same as for the rotary servo motors.
error Refer to section 8.3.
21.2 Encoder data
update error
21.3 Encoder data 1) Something near the device
waveform error
2) Encoder failure
Alarm No.: 24 Name: Main circuit error
Alarm content
Display Detail name
24.1 Ground fault Same as for the rotary servo motors.
detected by Refer to section 8.3.
hardware
detection circuit
24.2 Ground fault
detected by
software
detection
function
Error is found in the encoder data.
Cause
caused it.
Ground fault occurred at the servo motor power lines of the servo amplifier.
A ground fault occurred at the servo motor.
Cause
Stop system: Each axis
Check method
Check for noise, and Problem found.
other factors.
No problem found.
Replace the direct drive It is not repeatable.
motor, and then check
the repeatability.
Stop system: All axes
Check method
14 - 47
Check result
Take countermeasures
against its cause.
Check 2).
Replace the direct drive
motor.
Check result
Action
Action