Mitsubishi Electric MELSERVO-J4 Instruction Manual page 89

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 7D Name: Safety observation error
Alarm content
Detail
Detail name
No.
7D.2 Speed (1) The command pulse
observation
error
(2) The settings of the
(3) The command from the
(4) A larger speed
(5) The servo system is
(6) The velocity waveform
(7) The connection
(8) The encoder or linear
(9) The functional safety
(10) The servo amplifier is
(11) Something near the
Alarm No.: 82 Name: Master-slave operation error 1
Alarm content
Detail
Detail name
No.
82.1 Master-slave Check it with the check method for [AL. 34.1].
operation error
1
The safety observation function detected an error.
Cause
Check the command
frequency is high. pulse frequency.
Check the setting
electronic gear are value of the electronic
incorrect. gear.
Check if the command
controller is excessive. from the controller is
the SLS speed ([Pr.
PSA11] to [Pr.
PSA14]) or more.
Check that the actual
command than the SLS servo motor speed is
speed ([Pr. PSA11] to higher than the setting
[Pr. PSA14]) was value of the SLS
inputted. speed.
Check if the servo
unstable and motor is oscillating.
oscillating.
Check if it is
has overshot. overshooting because
the acceleration time
constant is too short.
Check the connection
destination of the destination of the
encoder cable is encoder.
incorrect.
Replace the servo
encoder is motor, and then check
malfunctioning.
the repeatability.
Replace the functional
unit is malfunctioning. safety unit, and then
check the
repeatability.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Check the noise,
device caused it. ambient temperature,
etc.
Driver communication error was detected.
Cause
Check method Check result
The command pulse
frequency is high.
The command pulse
frequency is low.
The setting value is
incorrect.
The setting value is
correct.
It is over the
permissible speed.
It is less than the
permissible speed.
The servo motor
speed is higher than
the SLS speed.
The servo motor
speed is lower than
the SLS speed.
It is oscillating.
It is not oscillating.
It is overshooting.
It is not
overshooting.
It is not correct.
It is correct.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It is not repeatable.
It is repeatable.
It has a failure.
Check method Check result
1 - 82
Action Target
Check operation [A]
pattern.
[B]
[GF]
Check (2).
Review the settings.
Check (3).
Check operation
pattern.
Check (4).
Review the setting
value of the SLS
speed.
Check (5).
Adjust the servo
gain. Or reduce the
load.
Check (6).
Increase the
acceleration/
deceleration time
constant.
Check (7).
Wire it correctly.
Check (8).
Replace the servo
motor.
Check (9).
Replace the
functional safety unit.
Check (10).
Replace the servo
amplifier.
Check (11).
Take
countermeasures
against its cause.
Action Target
[B]
(slave)