Mitsubishi Electric MELSERVO-J4 Instruction Manual page 49

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 30 Name: Regenerative error
Alarm content
Detail
Detail name
No.
30.3 Regeneration (1) A detection circuit of
feedback signal
error
(2) Something near the
Alarm No.: 31 Name: Overspeed
Alarm content
Detail
Detail name
No.
31.1 Abnormal (1) The command pulse
motor speed
(2) The settings of the
(3) The command from the
(4) A larger speed
(5) The servo motor was at
(6) The servo system is
(7) The velocity waveform
Permissible regenerative power of the built-in regenerative resistor or regenerative option is exceeded.
A regenerative transistor in the servo amplifier is malfunctioning.
Cause
Remove the
the servo amplifier is regenerative option or
malfunctioning. built-in regenerative
resistor, and then
check if the alarm
occurs at power on.
For MR-J4-03A6(-RJ)
and MR-J4W2-0303B,
check if the alarm
occurs at power on.
Check the noise,
device caused it. ground fault, ambient
temperature, etc.
The servo motor seed has exceeded the permissible instantaneous speed.
The linear servo motor seed has exceeded the permissible instantaneous speed.
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
over the permissible
speed.
Check that the actual
command than the servo motor speed is
overspeed alarm level higher than the setting
was inputted. value of [Pr. PC08
Overspeed alarm
detection level].
Check if the torque
the maximum torque (thrust) at the time of
(maximum thrust) at the acceleration is the
time of acceleration. maximum torque
(maximum thrust).
Check if the servo
unstable and oscillating. motor is oscillating.
Check if it is
has overshot. overshooting because
the acceleration time
constant is too short.
Check method Check result
The alarm occurs.
The alarm does not
occur.
It has a failure.
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 overspeed alarm
detection level.
The servo motor
speed is lower than
the overspeed alarm
detection level.
It is the maximum
torque (maximum
thrust).
It is less than the
maximum torque
(maximum thrust).
It is oscillating.
It is not oscillating.
It is overshooting.
It is not
overshooting.
1 - 42
Action Target
Replace the servo [A]
amplifier. [B]
[WB]
[RJ010]
[GF]
Check (2).
Take
countermeasures
against its cause.
Action Target
Check operation [A]
pattern.
Check (2).
Review the settings.
Check (5).
Check operation [B]
pattern. [WB]
[RJ010]
Check (4).
[GF]
Review the [Pr.
PC08] setting.
Check (5).
Increase the [A]
acceleration/ [B]
deceleration time [WB]
constant. Or reduce [RJ010]
the load. [GF]
Check (6).
Adjust the servo
gain. Or reduce the
load.
Check (7).
Increase the
acceleration/
deceleration time
constant.
Check (8).