Mitsubishi Electric MR-J2S-*B Series Instruction Manual page 135

9. TROUBLESHOOTING
Display Name
30 Regenerative
alarm
31 Overspeed
32 Overcurrent
Definition
Permissible 1. Mismatch between used
regenerative power regenerative brake option and
of the built-in parameter No. 2 setting
regenerative brake
2. Built-in regenerative brake
resistor or
resistor or regenerative brake
regenerative brake
option is not connected.
option is exceeded.
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- B:260VAC or more
MR-J2S- B1:135VAC or more
5. Built-in regenerative brake
resistor or regenerative brake
option faulty.
Regenerative 6. Regenerative transistor faulty.
transistor fault
1) The regenerative brake option
2) The alarm occurs even after
Speed has exceeded 1. Small acceleration/deceleration
the instantaneous time constant caused overshoot to
permissible speed. be large.
2. Servo system is instable to cause
overshoot.
3. Encoder faulty.
Current that flew is 1. Short occurred in servo amplifier
higher than the output phases U, V and W.
permissible current
2. Transistor of the servo amplifier
of the servo
faulty.
amplifier.
Alarm (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.
Current higher than
5. Improper wiring of the
the permissible
regenerative brake option.
current flew in the
regenerative brake
transistor.
(MR-J2S-500B only)
Cause
Checking method
Checking method
has overheated abnormally.
removal of the built-in
regenerative brake resistor or
regenerative brake option.
Checking method
9 - 4
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.
Increase acceleration/deceleration time
constant.
1. Reset 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.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.
Wire the regenerative brake option
correctly.