Mitsubishi Electric Melservo-J4 Instruction Manual page 98

Alarm No.: 8A
Alarm content
Detail Detail name
No.
8A.1 USB
communication
time-out error/
serial
communication
time-out error
8A.2 Modbus RTU
communication
time-out error
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
96
1.4 Remedies for alarms
Name: USB communication time-out error/serial communication time-out error/Modbus RTU
communication time-out error
 Communication between the servo amplifier and a personal computer/controller stopped for the
specified time or longer.
 An error occurred in USB communication, serial communication (Mitsubishi Electric general-purpose
AC servo protocol), or Modbus RTU communication.
Cause Check method
(1) Communication Check if a command was
commands have not transmitted from the
been transmitted. personal computer, etc.
(2) A communication cable Replace the
was disconnected. communication cable,
and then check the
repeatability.
(3) The servo amplifier is Replace the servo
malfunctioning. amplifier, and then check
the repeatability.
(1) Communication Check if a command was
commands have not transmitted from the
been transmitted. controller, etc.
(2) A communication cable Replace the
was disconnected. communication cable,
and then check the
repeatability.
(3) The servo amplifier is Replace the servo
malfunctioning. amplifier, and then check
the repeatability.
Check result Action
It was not transmitted. Transmit a command.
It was transmitted. Check (2).
It is not repeatable. Replace the
communication cable.
It is repeatable. Check (3).
It is not repeatable. Replace the servo
amplifier.
It was not transmitted. Transmit a command.
It was transmitted. Check (2).
It is not repeatable. Replace the
communication cable.
It is repeatable. Check (3).
It is not repeatable. Replace the servo
amplifier.
Target
[A]
[B]
[WB]
[RJ010]
[GF]
[A]