Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 75 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 68
Alarm No.: 69 Name: Command error
Alarm content
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.
Detail
No.
Detail name Cause Check method Check result Action Target
69.4 Reverse
rotation stroke
end detection -
Command
excess error
(1) The command position
exceeded 30 bits from
the detected position
after the detection of
LSN (Reverse rotation
stroke end).
Check the command
position. The command
position was set to
30 bits or more. Check operation
pattern. [GF]
It was set correctly. Check (2).
(2) The reverse rotation
stroke limit switch is not
connected to LSN
(Reverse rotation
stroke end).
Check if the limit
switch is connected
correctly. It is not connected. Connect it correctly.
It is connected. Check (3).
(3) The controller is
malfunctioning.
Replace the controller,
and then check the
repeatability. It is not repeatable. Replace the
controller.
It is repeatable. Check (4).
(4) Something near the
device caused it.
Check the noise,
ambient temperature,
etc. It has a failure. Take
countermeasures
against its cause.
69.5 Upper stroke
limit detection -
Command
excess error
(1) The command position
exceeded 30 bits from
the detected position
after the detection of
FLS (Upper stroke limit).
Check the command
position. The command
position was set to
30 bits or more. Check operation
pattern.
It was set correctly. Check (2).
(2) The upper stroke limit
switch is not wired.
Check if the limit
switch is wired
correctly. It has a failure. Take
countermeasures
against its cause.
Or the switch is
incorrectly positioned. Or check if the switch
is incorrectly
positioned. It has no failure. Check (3).
(3) Something near the
device caused it.
Check the noise,
ambient temperature,
etc. It has a failure. Take
countermeasures
against its cause.
It has no failure. Check (4).
(4) The controller is
malfunctioning.
Replace the controller,
and then check the
repeatability. It is not repeatable. Replace the
controller.
69.6 Lower stroke
limit detection -
Command
excess error
(1) The command position
exceeded 30 bits from
the detected position
after the detection of
RLS (Lower stroke
limit).
Check the command
position. The command
position was set to
30 bits or more. Check operation
pattern.
It was set correctly. Check (2).
(2) The lower stroke limit
switch is not wired.
Check if the limit
switch is wired
correctly. It has a failure. Take
countermeasures
against its cause.
Or the switch is
incorrectly positioned. Or check if the switch
is incorrectly
positioned. It has no failure. Check (3).
(3) Something near the
device caused it.
Check the noise,
ambient temperature,
etc. It has a failure. Take
countermeasures
against its cause.
It has no failure. Check (4).
(4) The controller is
malfunctioning.
Replace the controller,
and then check the
repeatability. It is not repeatable. Replace the
controller.