Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual page 278

12. TROUBLESHOOTING
Display Name
AL.30 Regenerative Permissible
alarm regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
Regenerative
transistor fault
AL.31 Overspeed Speed has exceeded
the instantaneous
permissible speed.
AL.32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier.
Definition
1. Wrong setting of parameter No. 0
2. Built-in regenerative brake resistor
or regenerative brake option is not
connected.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative brake option to be
exceeded.
Call the status display and check
the regenerative load ratio.
4. Power supply voltage is abnormal.
MR-J2S- CP-S084:260VAC or
more
MR-J2S- CP1-S084:135VAC or
more
5. Built-in regenerative brake resistor
or regenerative brake option
faulty.
6. Regenerative transistor faulty.
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative brake resistor or
regenerative brake option.
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
2. Small acceleration/deceleration
time constant caused overshoot to
be large.
3. Servo system is instable to cause
overshoot.
4. Electronic gear ratio is large
(parameters No. 4, 5)
5. Encoder faulty.
1. Short occurred in servo amplifier
output phases U, V and W.
2. Transistor (IPM) of the servo
amplifier faulty.
Alarm (AL.32) occurs if power is
switched on after U,V and W
are disconnected.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Cause
Checking method
Checking method
Checking method
12 - 7
Action
Set correctly.
Connect correctly
1. Reduce the frequency of positioning.
2. Use the regenerative brake option of
larger capacity.
3. Reduce the load.
Review power supply
Change servo amplifier or regenerative
brake option.
Change the servo amplifier.
Set command pulses correctly.
Increase acceleration/deceleration time
constant.
1. Re-set servo gain to proper value.
2. If servo gain cannot be set to proper
value:
1) Reduce load inertia moment ratio; or
2) Reexamine acceleration/
deceleration time constant.
Set correctly.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.