Mitsubishi Electric MELSERVO-J2 Series Instruction Manual page 206

11. TROUBLESHOOTING
Display
A.30 Regenerative
alarm
A.31 Overspeed
A.32 Overcurrent
Downloaded from ManualsNet.com
Name Definition
Permissible
regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded.
Regenerative
transistor fault
Cooling fan stop
(MR-J2-200C 350C)
Speed has exceeded
the instantaneous
permissible speed.
Current that flew is
higher than the
permissible current
of the servo
amplifier.
search engine
Cause
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.
Checking method
Call the status display and check
the regenerative load ratio.
Power supply voltage is abnormal.
MR-J2- C: 260V or more
4. 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.
5. Built-in regenerative brake resistor or
regenerative brake option faulty.
6. Unusual overheat due to cooling fan
stop
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. Encoder faulty.
1. Short occurred in servo amplifier
output phases U, V and W.
2. Transistor (IPM) of the servo amplifier
faulty.
Checking method
Alarm (A.32) occurs if power is
switched on after disconnection
of the U, V, W power cables.
3. Ground fault occurred in servo
amplifier output phases U, V and W.
4. External noise caused the overcurrent
detection circuit to misoperate.
11 - 5
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 the servo amplifier.
Change servo amplifier or
regenerative brake option.
1. Change the servo amplifier or
cooling fan.
2. Reduce ambient temperature.
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.
Change the servo motor.
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression
measures.