Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 175

8. TROUBLESHOOTING
Display Name
30 Regenerative
error
31 Overspeed
32 Overcurrent
Definition
Permissible 1. Wrong setting of parameter No.
regenerative power PA02
of the built-in
2. Built-in regenerative resistor or
regenerative resistor
regenerative option is not
or regenerative
connected.
option is exceeded.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative 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
MR-J3- B4: 535VAC or more
5. Built-in regenerative resistor or
regenerative option faulty.
Regenerative
6. Regenerative transistor faulty.
transistor fault
1) The regenerative option has
2) The alarm occurs even after
Speed has exceeded 1. Small acceleration/deceleration time
the instantaneous constant caused overshoot to be
permissible speed. large.
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 of
2. Transistor (IPM IGBT) of the servo
the servo amplifier.
amplifier faulty.
(If the alarm (32)
occurs again when
Alarm (32) occurs if power is
turning ON the servo
switched on after U,V and W are
after resetting the
disconnected.
alarm by turning
3. Ground fault occurred in servo
OFF/ON the power
motor power (U, V, W).
when the alarm (32)
4. External noise caused the
first occurred, the
overcurrent detection circuit to
transistor (IPM
misoperate.
IGBT) of the servo
amplifier may be at
fault. In the case, do
not repeat to turn
OFF/ON the power.
Check the transistor
with the checking
method of "Cause
2".)
Cause
Checking method
Checking method
overheated abnormally.
removal of the built-in
regenerative resistor or
regenerative option.
Checking method
8 - 4
Action
Set correctly.
Connect correctly
1. Reduce the frequency of positioning.
2. Use the regenerative option of larger
capacity.
3. Reduce the load.
Review power supply
Change servo amplifier or regenerative
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.