Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 240

8. TROUBLESHOOTING
Alarm No.: A.8E Name: USB communication error
Description
Detailed Detailed
display Name
8E.1 USB 1)
communication
receive error
2)
3)
4)
8E.2 USB 1)
communication
2)
checksum
error
3)
4)
8E.3 USB 1)
communication
2)
character
error
3)
4)
8E.4 USB 1)
communication
2)
command
error
3)
4)
8E.5 USB 1)
communication
2)
data No.
error
3)
4)
Alarm No.: 888 (Note) Name: Watchdog
Description
Detailed Detailed
display Name
1) Fault of parts in the servo
Note. At power-on, "888" appears instantaneously, but it is not an error.
USB communication error occurred between the servo amplifier and the communication device (e.g.
personal computer).
Cause
Communication cable fault Check if the alarm
Communication device
(e.g. personal computer)
setting error
Fault in the surrounding
environment
Servo amplifier fault
Communication cable fault Execute the checking methods mentioned in the alarm display "8E.1".
Communication device
(e.g. personal computer)
setting error
Fault in the surrounding
environment
Servo amplifier fault
Communication cable fault Execute the checking methods mentioned in the alarm display "8E.1".
Communication device
(e.g. personal computer)
setting error
Fault in the surrounding
environment
Servo amplifier fault
Communication cable fault Execute the checking methods mentioned in the alarm display "8E.1".
Communication device
(e.g. personal computer)
setting error
Fault in the surrounding
environment
Servo amplifier fault
Communication cable fault Execute the checking methods mentioned in the alarm display "8E.1".
Communication device
(e.g. personal computer)
setting error
Fault in the surrounding
environment
Servo amplifier fault
CPU or part is faulty.
Cause
amplifier
Checking method
Alarm does not
occurs after replacing occur.
the USB cable.
Alarm occurs.
Check the Incorrect setting
communication setting
Correct setting
of the communication
device.
Check the noise, etc. An error is found.
No error.
Check if the alarm Alarm does not
occurs after replacing occur.
the servo amplifier.
Checking method
8 - 23
Result Action
Replace the USB cable.
Check 2).
Check the setting.
Check 3).
Take the appropriate
measures according to the
cause.
Check 4).
Replace the servo
amplifier.
Result Action
Replace the servo
amplifier.