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