Mitsubishi Electric Melservo-J4 Instruction Manual page 80

Alarm No.: 69
Alarm content
Detail Detail name
No.
69.3 Forward
rotation stroke
end detection -
Command
excess error
69.4 Reverse
rotation stroke
end detection -
Command
excess error
69.5 Upper stroke
limit detection -
Command
excess error
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
78
1.4 Remedies for alarms
Name: Command error
 The command position exceeded 32 bits (-2147483648 to 2147483647) when the software limit is
activated.
 The command position exceeded 30 bits (-536870912 to 536870911) from the value that was set when
the software limit was activated.
 After the detection of LSP (Forward rotation stroke end) or LSN (Reverse rotation stroke end), the
command position exceeded 30 bits (-536870912 to 536870911) from the detected position.
 After the detection of FLS (Upper stroke limit) or RLS (Lower stroke limit), the command position
exceeded 30 bits (-536870912 to 536870911) from the detected position.
Cause Check method
(1) The command position Check the command
exceeded 30 bits from position.
the detected position
after the detection of
LSP (Forward rotation
stroke end).
(2) The forward rotation Check if the limit switch
stroke limit switch is not is connected correctly.
connected to LSP
(Forward rotation stroke
end).
(3) The controller is Replace the controller,
malfunctioning. and then check the
repeatability.
(4) Something near the Check the noise, ambient
device caused it. temperature, etc.
(1) The command position Check the command
exceeded 30 bits from position.
the detected position
after the detection of
LSN (Reverse rotation
stroke end).
(2) The reverse rotation Check if the limit switch
stroke limit switch is not is connected correctly.
connected to LSN
(Reverse rotation stroke
end).
(3) The controller is Replace the controller,
malfunctioning. and then check the
repeatability.
(4) Something near the Check the noise, ambient
device caused it. temperature, etc.
(1) The command position Check the command
exceeded 30 bits from position.
the detected position
after the detection of
FLS (Upper stroke
limit).
(2) The upper stroke limit Check if the limit switch
switch is not wired. is wired correctly.
Or the switch is Or check if the switch is
incorrectly positioned. incorrectly positioned.
(3) Something near the Check the noise, ambient
device caused it. temperature, etc.
(4) The controller is Replace the controller,
malfunctioning. and then check the
repeatability.
Check result Action
The command position Check operation pattern.
was set to 30 bits or
more.
It was set correctly. Check (2).
It is not connected. Connect it correctly.
It is connected. Check (3).
It is not repeatable. Replace the controller.
It is repeatable. Check (4).
There is a problem in the Take countermeasures
surrounding. against its cause.
The command position Check operation pattern.
was set to 30 bits or
more.
It was set correctly. Check (2).
It is not connected. Connect it correctly.
It is connected. Check (3).
It is not repeatable. Replace the controller.
It is repeatable. Check (4).
There is a problem in the Take countermeasures
surrounding. against its cause.
The command position Check operation pattern.
was set to 30 bits or
more.
It was set correctly. Check (2).
It has a failure. Take countermeasures
against its cause.
It has no failure. Check (3).
There is a problem in the Take countermeasures
surrounding. against its cause.
There is no problem in Check (4).
the surrounding.
It is not repeatable. Replace the controller.
Target
[GF]