Mitsubishi Electric MR-J3-10B Instruction Manual page 145

8. TROUBLESHOOTING
Display
30 Regenerative
alarm
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31 Overspeed
32 Overcurrent
Name Definition
Permissible
regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
Regenerative
transistor fault
Speed has
exceeded the
instantaneous
permissible speed.
Current that flew is
higher than the
permissible current
of the servo
amplifier.
Cause
1. Wrong setting of parameter No.
PA02
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.
Checking method
Call the status display and check
the regenerative load ratio.
4. Power supply voltage is abnormal.
MR-J3- B:260VAC or more
MR-J3- B1:More than 135VAC
5. Built-in regenerative brake resistor
or regenerative brake option faulty.
6. Regenerative transistor faulty.
Checking method
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. Small acceleration/deceleration time
constant caused overshoot to be
large.
2. Servo system is instable to cause
overshoot.
3. Encoder faulty.
1. Short occurred in servo motor power
(U, V, W).
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (32) occurs if power is
switched on after U,V and W are
disconnected.
3. Ground fault occurred in servo motor
power (U, V, W).
4. External noise caused the
overcurrent detection circuit to
misoperate.
8 - 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. 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.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.