Mitsubishi Electric MELSERVO-J4 Instruction Manual page 74

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 69 Name: Command error
Alarm content
Detail
Detail name
No.
69.1 Forward (1) The command position
rotation-side
software limit
detection -
Command
excess error
(2) The command position
(3) The controller is
(4) Something near the
69.2 Reverse Check it with the check method for [AL. 69.1].
rotation-side
software limit
detection -
Command
excess error
69.3 Forward (1) The command position
rotation stroke
end detection -
Command
excess error
(2) The forward rotation
(3) The controller is
(4) Something near the
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 if the command
exceeded 32 bits when position is correct.
the software limit is
activated.
Check if the parameter
exceeded 30 bits from settings of the
the value that was set software limit ([Pr.
when the software limit PT15] to [Pr. PT18]) to
was activated. the command position
are correct.
Replace the controller,
malfunctioning. and then check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Check the command
exceeded 30 bits from position.
the detected position
after the detection of
LSP (Forward rotation
stroke end).
Check if the limit
stroke limit switch is not switch is connected
connected to LSP correctly.
(Forward rotation
stroke end).
Replace the controller,
malfunctioning. and then check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Check method Check result
The command
position was set to
32 bits or more.
The command
position was set
correctly.
It was set within the
command position.
It was set correctly.
It is not repeatable.
It is repeatable.
It has a failure.
The command
position was set to
30 bits or more.
It was set correctly.
It is not connected.
It is connected.
It is not repeatable.
It is repeatable.
It has a failure.
1 - 67
Action Target
Set the command [GF]
position correctly.
Check (2).
Set [Pr. PT15] to
[Pr. PT18] correctly.
Check (3).
Replace the
controller.
Check (4).
Take
countermeasures
against its cause.
Check operation
pattern.
Check (2).
Connect it correctly.
Check (3).
Replace the
controller.
Check (4).
Take
countermeasures
against its cause.