Mitsubishi Electric MELSERVO-JE MR-JE-100A, Instruction Manual

Page: 234 / 310

8. TROUBLESHOOTING
8 - 13
Alarm No.: 30 Name: Regenerative error
Alarm content
Permissible regenerative power of the built-in regenerative resistor or regenerative option is exceeded.
A regenerative transistor in the servo amplifier is malfunctioning.
Display Detail name Cause Check method Check result Action
30.1 Regeneration
heat error
(1) The setting value is
incorrect. Set it correctly. The setting of the
regenerative resistor
(regenerative option) is
incorrect. Check the regenerative
resistor (regenerative
option) and [Pr. PA02]
setting.
It is set correctly. Check (2).
(2) It is not connected
correctly. Connect it correctly. The regenerative resistor
(regenerative option) is
not connected. Check if the regenerative
resistor (regenerative
option) is connected
correctly.
It is connected correctly. Check (3).
(3) Power supply voltage
high.
Check the input power
supply voltage. It is over 240 V AC. Reduce the power
supply voltage.
It is 240 V AC or less. Check (4).
(4) The regenerative load
ratio has been over
100%.
Check the regenerative
load ratio when alarm
occurs. It is 100% or more. Reduce the frequency of
positioning. Reduce the
load. Use a regenerative
option if it is not being
used. Review the
regenerative option
capacity.
30.2 Regeneration
signal error
(1) A detection circuit of the
servo amplifier is
malfunctioning.
Check if the regenerative
resistor (regenerative
option) is overheating. It is overheating
abnormally. Replace the servo
amplifier.
30.3 (1) The alarm occurs. Replace the servo
amplifier. Regeneration
feedback signal
error A detection circuit of the
servo amplifier is
malfunctioning. Remove the regenerative
option or built-in
regenerative resistor and
then check if the alarm
occur at power on.
The alarm does not
occur. Check (2).
(2) Something near the
device caused it.
Check the noise, ground
fault, ambient
temperature, etc. It has a failure. Take countermeasures
against its cause.
Alarm No.: 31 Name: Overspeed
Alarm content The servo motor seed has exceeded the permissible instantaneous speed.
Display Detail name Cause Check method Check result Action
31.1 (1) The command pulse
frequency is high.
Check the command
pulse frequency. The command pulse
frequency is high. Check operation pattern. Abnormal
motor speed
The command pulse
frequency is low. Check (2).
(2) The servo motor was at
the maximum torque at
the time of acceleration.
It is the maximum torque. Increase the
acceleration/deceleration
time constant. Or reduce
the load.
Check if the torque at the
time of acceleration is
the maximum torque.
It is lower than the
maximum torque. Check (3).
(3) The servo system is
unstable and oscillating.
Check if the servo motor
is oscillating. It is oscillating. Adjust the servo gain. Or
reduce the load.
It is not oscillating. Check (4).
(4) The velocity waveform
has overshot.
It is overshooting. Increase the
acceleration/deceleration
time constant. Check if it is
overshooting because
the acceleration time
constant is too short.
It is not overshooting. Check (5).
(5) An encoder is
malfunctioning.
Check if the alarm is
occurring during less
than permissible
instantaneous speed. It is occurring during less
than permissible
instantaneous speed. Replace the servo motor.