Mitsubishi Electric MR-J3-B Instruction Manual page 145

8. TROUBLESHOOTING
Display Name
30 Regenerative
alarm
31 Overspeed
32 Overcurrent
Definition
Permissible 1. Wrong setting of parameter No.
regenerative power PA02
of the built-in
2. Built-in regenerative brake resistor
regenerative brake
or regenerative brake option is not
resistor or
connected.
regenerative brake
3. High-duty operation or continuous
option is exceeded.
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-J3- B:260VAC or more
MR-J3- B1:More than 135VAC
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 1. Small acceleration/deceleration time
exceeded the constant caused overshoot to be
instantaneous large.
permissible speed.
2. Servo system is instable to cause
overshoot.
3. Encoder faulty.
Current that flew is 1. Short occurred in servo motor power
higher than the (U, V, W).
permissible current
2. Transistor (IPM) of the servo
of the servo
amplifier faulty.
amplifier.
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.
Cause
Checking method
Checking method
has overheated abnormally.
removal of the built-in
regenerative brake resistor or
regenerative brake option.
Checking method
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.